Soil temperatures in iowa

Young plants, however, are sensitive to direct sunlight and need to be placed in partial shade during development. Temperature affects the rate of seed metabolism and most have a temperature range within which they germinate. The optimal temperature is between 70 to 80 degrees Fahrenheit or 21 to 26 degrees Celsius.

Farmers are reminded to wait until soil temperatures remain below 50 degrees Fahrenheit before applying anhydrous ammonia (NH3) fertilizer this fall. Harvest is progressing rapidly in many parts of the state and officials with the Iowa Department of Agriculture and Land Stewardship and Iowa State University Extension and Outreach …24 inch Soil Moisture [%] 50 inch Soil Moisture [%] Atmospheric Pressure [mb] (only Ames ISU Hort Farm at 15 minute interval) CS SoilVue 10. All SoilVue Temperature + Moisture Data. 2 inch. 12 inch. 20 inch. 30 inch.Iowa 4 inch soil temperature maps for the last three days are published by ISU Extension and the College of Agriculture and Life Sciences. Soil temperatures at 4-inch depth around Iowa are kept updated on the weather page on Iowa State University's website. People involved in agriculture who are interested in weather can watch two online sites ...As of April 7, soil temperatures ranged from 46 F in southern Iowa, to as low as 33 F in the north. Daily fluctuations are common, especially in early spring. Historically, the optimum planting window for Iowa corn has been April 11 to May 18, with a shorter window in the northern part of the state compared to the south.Measure soil temperatures 5-10 cm deep, where a lot of root activity is going to happen. Proactively record soil temperature regularly. Apply N once root zone temperatures reach 4.5 to 5.0°C or above for 3 consecutive days. Soil temperature by date. Location.A minimum soil temperature of 50º F (10º C) during the 24 hours following planting is recommended. At soil temperatures below 50º F (10º C), the risk of slow germination, infection of seedling diseases, and reduced stand establishment increases. Soybeans typically require between 90 and 130 GDUs to emerge, depending upon soil type.Soil temperature is an important physical variable of soil and plays a key role in controlling the underground hydro-thermal processes in permafrost regions on the Qinghai-Tibetan Plateau (QTP). Daily soil temperatures were observed at five different vegetation cover sites (alpine wet meadow, alpine meadow, alpine steppe, alpine desert steppe ...

Iowa’s rich soil developed under prairie plants and was held tightly by them. When prairie plants die, their decomposition returns nutrients to the soil, creating a rich, black silty soil. When Iowa land was first plowed, the settlers found 14 to 16 inches of topsoil. By 2000 the average was six to eight inches.Base temperatures used in calculating GDD vary depending on the type of plant or pest that is being monitored. This number represents the temperature at which you will typically begin to see plant or pest growth 2.The base temperature most often used in calculations is 50°F (10°C), because it is the temperature when active growth begins for most organisms 3.This model takes as forcing observed precipitation and temperature and calculates soil moisture, evaporation, runoff and snowpack. The daily CONUS soil moisture dataset is calculated with real-time daily precipitation and temperature from CPC in-house products with a 1-day delay. Soil moisture percentiles are based on the period from 1895 to ...Welcome to the Iowa State University Agronomy Extension Soil Fertility Home Page. Nutrient topics are listed in the drop down menu. ... Current Weather. SOIL FERTILITY; Department of Agronomy 716 Farm House Lane Ames, IA 50011. Antonio Mallarino [email protected] 515-294-6200 phone. John Sawyer [email protected]. Facebook @IowaStateU;Northwest Iowa. Extension agronomist Joel DeJong said that while his coverage area is one of the more livestock dense in the state, it still has very productive soil. "This area is crop-intense and uses manure as a crop fertilizer nutrient on many acres," DeJong said. "Much of this region is formed in wind-blown loess soils.Plants are actually more sensitive to soil temp than to above ground air temperature. True The downward flow of water by gravitation through a soil sucks fresh air into the soil.GDDTracker starts counting GDDs on Feb. 15. The crabgrass preemergence model uses GDD (base 32 degrees Fahrenheit) to indirectly measure soil temperatures in a turf situation (enter your zip code under the map and then click on "Crabgrass PRE"). The GDD model attempts to predict the optimum application timing for when the 0-2 inch depth ...

According to the April 5 soil temperature map provided by the Iowa Environmental Mesonet, nearly all counties in Iowa are at 50 degrees Fahrenheit or warmer – the minimum for planting corn. ... Although soil temperature at planting is important, agronomists advise that the soil temperature should remain at 50 F or trend upward …Soil Temperatures. Data from the Iowa State Soil Moisture Network is found on this website and daily soil temperature averages are used to produce the highlighted analysis. Precipitation. More Precipitation Maps. Current Data. The IEM combines data from participating networks into products like maps shown above and web applications to analyze ...Apr 20, 2022 · As of April 7, soil temperatures ranged from 46° F in southern Iowa, to as low as 33° F in the north. Daily fluctuations are common, especially in early spring. Historically, the optimum planting window for Iowa corn has been April 11 to May 18, with a shorter window in the northern part of the state compared to the south. Soil temperature for planting vegetables. Vegetable seeds require a number of different conditions to germinate and sprout successfully. The most critical aspects tend to be the presence of moisture and a soil temperature that’s within a defined range. Most vegetable seeds germinate well at soil temperatures between 60°F (16°C) and 75°F ...

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Iowa Soil Temperature Estimates. Daily average 4-inch depth soil temperatures by county for Iowa.Soil moisture and aeration also relate to temperature. But soil temperature is at its most important in the critical early stages of plant life, the germination of the seed and the development of the seedling before it breaks the surface. If the soil is too cold, the seed may not germinate; even if it does, growth may be permanently affected.Soil Drainage Class. The frequency and duration of wet periods under conditions similar to those under which the soil formed. View and download print-ready Iowa state soil property maps by depth derived from the National Cooperative Soil Survey's gSSURGO database.Check Iowa's soil temperatures here with us at CIA. Home Our Mission Products Services Markets, Weather & News Calendar Contact Home ... Current Soil Temperatures. Central Iowa Agriculture 812 Edwards Street | Jewell, IA 50130 515-827-9027. Our Mission Products ServicesAmes, Iowa — Iowa State University is reminding farmers about a resource to help them determine when to plant their crops. Experts tell us soil temperature is one of the […]Plants are actually more sensitive to soil temp than to above ground air temperature. True The downward flow of water by gravitation through a soil sucks fresh air into the soil.

You need to consider such as soil temperature, frost dates, and daylight hours to determine the best time to sow your seeds. For planting, ideal soil temperature plays a significant role. Peas prefer soil temperatures between 40°F and 75°F (4°C and 24°C) for optimal germination and growth.Ideally, morel mushrooms prefer air temperatures of 60 degrees or higher with soil temperatures between 45 and 50 degrees. Right now our soil temperatures are nearly perfect, sitting at 46 degrees ...As of April 7, soil temperatures ranged from 46 F in southern Iowa, to as low as 33 F in the north. Daily fluctuations are common, especially in early spring. Historically, the optimum planting window for Iowa corn has been April 11 to May 18, with a shorter window in the northern part of the state compared to the south.Drought conditions during most of the growing season in Iowa can have a profound impact on soil heath, just as when we have extreme wet conditions. The effect of drought can be noticed very clearly on crop performance when the lack of water availability is severe. This water stress can affect soil chemical, physical, and biological activities that are essential for plant and soil health.Imbibitional chilling occurs when there is a drastic change in the water temperature during imbibition. The critical time for this to occur is within 24 hours of planting. Cold Injury is when there is a change in the soil temperature after the seed has imbibed water. The effects of imbibitional chilling and cold injury are ultimately the same ...The best soil temperature for plants varies by species, but most plants thrive in soil temperatures between 60 to 80 degrees Fahrenheit (15 to 27 degrees Celsius). Do I need a soil thermometer? A soil thermometer is a useful tool for gardeners and farmers to monitor and optimize planting and gardening conditions, but it's not strictly ...Take advantage of 48-hour windows of 50°F soil temperatures with good planting conditions so your farmwide corn field planting dates fall more in the optimum periods as shown in the Iowa article. CropWatch posts daily and weekly soil temperature averages (provided by the Nebraska State Climate Office ) in map and table formats for …What is the soil temperature in Iowa? The northern portion of the state is still sitting around the low 40s, while much of the southern half of Iowa has soil temperatures in the upper 40s, with a few counties in south central Iowa reaching the 50 degree mark.The optimum temperature for emergence of cabbage and pinch seeds vary from 8° to 11°C, that for emergence of beets and cauliflower seeds varies from 11° to 18°C. If the temperature of the soil is very low then seeds either do not germinate or germinate very feebly. Seeds may be injured in very hot soil.The high temperature for Des Moines reached 80 degrees for the last day of April and made for the fourth day of the month with such a warm high temperature. The featured chart presents the number of such days each April for the airport. The average total is just two days, but there have been other recent years with higher totals than this year.Strip-tillage leads to warm up of soil temperature and improvement of plant emergence. Strip-tillage has a yield advantage over no-till in wet, poorly drained soils. ... Integrated Crop Management News, and Iowa State University Extension and Outreach. If this article is to be used in any other manner, permission from the author is required ...Yes, Iowa has some of the world's most fertile soil. The state's soil is often referred to as "black gold" and is ideal for agriculture. It is a result of the glaciers that pushed into Iowa around 15,000 years ago and left behind rich deposits of loess. This fertile soil supports the state's agriculture industry and allows for high ...

While soil temperatures at the 4-inch depth dropped down into the low 40s and even upper 30s across the state of Iowa by November 2, warmer air temperatures this week will raise soil temperatures, possibly above the 50° F threshold. Soil temperatures at the 4-inch depth across the state of Iowa for Nov. 2, 2020.

Apr 17, 2024 · In this case most of the state is May 11-20, with about one-fourth of the state being earlier than May 11th, and a small area in northeast Iowa that can see last freezes up until May 31st. Figure 2. Iowa Soil Temperatures at 4 inches, April 16, 2024. Figure 3. Forecast Soil Temperatures at the 4-inch Depth for April 21, 2024. Iowa 4 inch soil temperature maps for the last three days are published by ISU Extension and the College of Agriculture and Life Sciences. Soil temperatures at 4-inch depth around Iowa are kept updated on the weather page on Iowa State University's website. People involved in agriculture who are interested in weather can watch two online sites ...The soil temperature fluctuates more slowly than that of the air due to the relatively high heat capacity of the soil and the relatively low heat conductance of the soil. This means that a sunny day can see ground temperatures that are much warmer than air temperatures (10-40F is normal), but on a cold, clear winter night, temperatures can be ...The rich, deep Tama soil is Iowa's state soil and is the soil series on more than 933,000 Iowa acres. ... Productivity has also changed as weather has. In western Iowa, for example, rain had been the limiting factor for corn yields. Now that isn't so much the case. More of western Iowa is getting ideal rainfall for corn production now ...A new report projects that climate change will limit corn yield growth throughout Iowa over the next decade and beyond. The Environmental Defense Fund report assembled 20 different climate models ...Soil Temperatures. Data from the Iowa State Soil Moisture Network is found on this website and daily soil temperature averages are used to produce the ...As of April 7, soil temperatures ranged from 46 F in southern Iowa to as low as 33 F in the north. Daily fluctuations are common, especially in early spring. Historically, the optimum planting window for Iowa corn has been April 11 to May 18, with a shorter window in the northern part of the state compared to the south.Spiio reports hourly data from cellular wireless, in-ground soil sensors and immediate insights on soil temperatures, moisture, salinity and even light. Subscribe Now >> Know More. Know Sooner. Know Spiio. Agronomists and superintendents have a dashboard of the entire property and can quickly see and hone in on areas of concern. ...Apr 23, 2018 ... Optimum planting date windows to obtain at least 98% yield potential range from April 15-May 9 for northwest and cental Iowa; from April 17-May ...

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Web Soil Survey (WSS) provides soil data and information produced by the National Cooperative Soil Survey. It is operated by the USDA Natural Resources Conservation Service (NRCS) and provides access to the largest natural resource information system in the world. NRCS has soil maps and data available online for more than 95 percent of the ...20240422. About the Data: The Climate Prediction Center daily (1200 - 1200 UTC) soil temperature reports are from approximately 50 stations across southern and mid western tier of the US in near real time (within 12 hours). The data include multiple sources across the US: NWS Cooperative Observer Network (COOP) via Weather Forecast Offices (WFO ...What is the soil temperature in Iowa? The northern portion of the state is still sitting around the low 40s, while much of the southern half of Iowa has soil temperatures in the upper 40s, with a few counties in south central Iowa reaching the 50 degree mark.Calculations to derive predictions of A s, P s and D s are discussed below.. 2.1.Determining average annual soil temperature, A s Average annual soil temperature was calculated using the observed average annual air temperature (A a, °C) over the time period of simulation, correcting for the effect of stand leaf area index (L, m m −2) and the canopy cover of weeds/understorey (a w, 0.0-1.0 ...Web Soil Survey. Web Soil Survey - Web Soil Survey provides soil data and information produced by the National Cooperative Soil Survey. It is operated by the USDA Natural Resources Conservation Service and provides access to the largest natural resource information system in the world. Published Soil Surveys for Iowa.A new report projects that climate change will limit corn yield growth throughout Iowa over the next decade and beyond. The Environmental Defense Fund report assembled 20 different climate models ...Iowa 4 inch soil temperature maps for the last three days are published by ISU Extension and the College of Agriculture and Life Sciences. Soil temperatures at 4-inch depth around Iowa are kept updated on the weather page on Iowa State University's website. People involved in agriculture who are interested in weather can watch two online sites ... 2" and 4" soil temperature (24-hr and 7-day) Current soil temperature (24-hr period) Soil temperature climatology tool (warms-above and cools-below dates) Freeze date tool. Illinois State Water Survey - Water and Atmospheric Resources Monitoring Program (WARM)- IllinoisSoil Data. Iowa State Soil Moisture Network Iowa Average 4 inch Soil ... As of April 7, soil temperatures ranged from 46 F in southern Iowa, to as low as 33 F in the north. Daily fluctuations are common, especially in early spring. Historically, the optimum planting window for Iowa corn has been April 11 to May 18, with a shorter window in the northern part of the state compared to the south.So don’t leave it up to chance: Invest in a soil thermometer (about $10 and here’s a good one on Amazon) tells you in just a minute or two. Listed below are the soil temperatures at which various vegetables should be planted.* The temperatures are based on temperatures taken at 8 a.m. at 4 inches deep. The 2-inch Soil Temperature map displays the current soil temperature (degrees F) at 2 inches (5 cm) under the existing vegetative cover at each Mesonet site. This map is updated every 15 minutes. Theme. Iowa's soil erosion is accelerating as climate change spurs more severe weather events, research finds. A record 4 derechos have hit Iowa in 2 years. ….

4 inch Soil Temperature Probabilities. This application computes soil temperature exceedance based on the observation record of a ISU Ag Climate site. The average daily 4 inch soil temperature is used in this calculation. Spring: The values represent the percentage of years that a temperature below the given threshold was observed after a given ...Apply mulch once soil temperatures have been 40°F or below for 3 consecutive days, which is the threshold at which the plants enter dormancy. In Minnesota, this occurs between November and December. Do not apply mulch until the plants are dormant. Spread straw at a rate of 2.5 to 3.0 tons per acre, covering the plants by 2 to 3 inches. 20240422. About the Data: The Climate Prediction Center daily (1200 - 1200 UTC) soil temperature reports are from approximately 50 stations across southern and mid western tier of the US in near real time (within 12 hours). The data include multiple sources across the US: NWS Cooperative Observer Network (COOP) via Weather Forecast Offices (WFO ... Yes, Iowa has some of the world's most fertile soil. The state's soil is often referred to as "black gold" and is ideal for agriculture. It is a result of the glaciers that pushed into Iowa around 15,000 years ago and left behind rich deposits of loess. This fertile soil supports the state's agriculture industry and allows for high ...Evaluate Soil Temperatures To get a good sense of soil temperature, Rieck-Hinz says to measure it at about 10 a.m. or 7 p.m. CST. ... Another option for Iowa farmers is to check the ISU Iowa ...Soil GDUs were calculated from the data logger temperatures to approximate how long emergence would take under low and high residue conditions. In general, approximately 125 soil GDUs are needed after planting for corn emergence. From April 1 to April 30, soils under low residue were able to accumulate 99 soil GDUs.Historical Iowa Weather. These graphs take a look at average Iowa precipitation, growing degree days (GDD), and high and low temperatures from the year 2000 to 2015. As you can see, over the past few years we have experienced many extreme events from the heat in 2012, significant rainfall in June of 2010 and 2014, and above average temperatures ...That temperature is a key threshold for seed germination. Soil temps are predicted to rise into the 60s in the coming days before retreating into the 40s by the end of next week. Air temperatures are expected to peak in the 80s in most of Iowa this weekend, according to the National Weather Service.You can monitor the 3-day history average soil temperatures in every Iowa county and forecasted 4-inch soil temperatures here on the ISU Environmental Mesonet website. Historically, the soil temperatures at the 4-inch depth cool below 50° F in the northern third of the state the first week of November.What is the soil temperature in Iowa? The northern portion of the state is still sitting around the low 40s, while much of the southern half of Iowa has soil temperatures in the upper 40s, with a few counties in south central Iowa reaching the 50 degree mark. ... At less than 4 inches deep, soil temperatures can vary just as fast as the air ... Soil temperatures in iowa, Soil Temperatures. Data from the Iowa State Soil Moisture Network is found on this website and daily soil temperature averages are used to produce the highlighted analysis. Precipitation. More Precipitation Maps. Current Data. The IEM combines data from participating networks into products like maps shown above and web applications to analyze ..., While soil temperatures at the 4-inch depth dropped down into the low 40s and even upper 30s across the state of Iowa by November 2, warmer air temperatures this week will raise soil temperatures, possibly above the 50° F threshold. Soil temperatures at the 4-inch depth across the state of Iowa for Nov. 2, 2020., Plants are actually more sensitive to soil temp than to above ground air temperature. True The downward flow of water by gravitation through a soil sucks fresh air into the soil., Graph of the observed summer average temperature for Iowa from 1895 to 2020 as described in the caption. Y-axis values range from 66 to 78 degrees Fahrenheit. ... Rising temperatures will increase evaporation rates and the rate of soil moisture loss. Thus, periodic summer droughts, a natural part of Iowa's climate, are likely to be more ..., The first fall day when the average soil temperatures are below 50 degrees Fahrenheit is occurring later and later in the season (Figure 2), a change that delays the time of fall N application. Figure 2. Iowa's fall soil temperatures. First day of the fall season when the average 4-inch soil temperature was below 50 degrees Fahrenheit., Iowa Department of Agriculture and Land Stewardship. 515-281-3375. [email protected]. Farmers are reminded to wait until soil temperatures remain below 50 degrees Fahrenheit before applying anhydrous ammonia (NH3) fertilizer this fall., ISU Soil Moisture Network. Iowa State University maintains a network of observation stations located primarily at the Research and Demonstration Farms, but also at cooperating locations. Data from this network dates back to 1986!, For ideal yields, the best time for planting in Iowa is April 15-May 20, but soil temperatures and moisture levels are even better indicators than a calendar. Soil is ready for planting when it is above 50 degrees and trending warmer, Licht said. ... With soil temperatures in the mid-50s and even into the 60s in parts of Iowa last week, farmers ..., Soil moisture and aeration also relate to temperature. But soil temperature is at its most important in the critical early stages of plant life, the germination of the seed and the development of the seedling before it breaks the surface. If the soil is too cold, the seed may not germinate; even if it does, growth may be permanently affected., Soil moisture and aeration also relate to temperature. But soil temperature is at its most important in the critical early stages of plant life, the germination of the seed and the development of the seedling before it breaks the surface. If the soil is too cold, the seed may not germinate; even if it does, growth may be permanently affected., ECT/RT-1 Temperature Port 1 6 in 57.8 °F ECT/RT-1 Temperature Port 2 12 in 52.9 °F *Soil temps are updated hourly. Soil Probe located in Havelock, Iowa. Havelock ..., Current weather in Sioux City, IA. Check current conditions in Sioux City, IA with radar, hourly, and more., (a) Comparison of monthly average 10 cm soil temperatures for three Agro-IBIS model simulations with observational station data from Hu and Feng (2003) averaged over the state of Iowa for 1982-2002., Not only will mulch give your outdoor landscaping areas a finished appearance, but mulch also has some important benefits for your plants. With a thick layer of mulch on the ground..., State Climatologist Justin Glisan told Iowa Capital Dispatch early planting this year was first stalled in April because of low temperatures five degrees below average. He said 2022 had one of Iowa’s top 15 coldest winters. Soil temperatures need to be at least 50 degrees to plant corn seed that is likely to sprout., Sustained soil temperatures of at least 50 degrees are necessary for corn seed to reliably sprout, but those temperatures have lagged in the 40s for much of the planting season so far. On Sunday, most of the southern half of Iowa was averaging soil temps of about 50 degrees, whereas parts of far northern Iowa were in the low-to-mid 40s ..., During dry weather, water roses about every 7 to 10 days. Water slowly but deeply. When watering roses, apply the water directly to the soil around the base of the plant. Avoid overhead watering. Wet foliage increases the risk of disease problems. An excellent way to conserve soil moisture is by mulching., Measure soil temperatures 5-10 cm deep, where a lot of root activity is going to happen. Proactively record soil temperature regularly. Apply N once root zone temperatures reach 4.5 to 5.0°C or above for 3 consecutive days. Soil temperature by date: Location: 02/03: 03/03: 04/03: 05/03: 06/03: 07/03: 08/03: 09/03: 10/03: 11/03: 12/03: 13/03:, Soil temperatures at 15 cm depth were recorded on a single occasion at multiple grid points on two algific talus slopes during the summer of 1999. To represent and compare soil temperatures over a wider area, soil temperatures were measured (less intensively) at five other algific slopes and three non-algific forested slopes. Algific slopes appear to have greater variation in soil temperatures ..., Adam McCann, WalletHub Financial WriterAug 23, 2022 While the U.S. is one of the most educated countries in the world, it doesn’t provide the same quality elementary school or seco..., The disturbance exited eastern Iowa in the early afternoon as gusty southerly winds built in. A strong warm front lifted north over Iowa, pushing daytime temperatures into the upper 70s and low 80s in southern and western Iowa; temperatures remained in the low 60s northeast; the statewide average high was 73 degrees, 10 degrees above normal., Brown, I. Climate change and soil wetness limitations for agriculture: spatial risk assessment framework with application to Scotland. Geoderma 285 , 173-184 (2017). Article Google Scholar, Soil Temperatures. Data from the Iowa State Soil Moisture Network is found on this website and daily soil temperature averages are used to produce the highlighted analysis., Many corn fields across Iowa had significant variation in plant emergence and early-season growth within fields. Uneven emergence and plant heights are caused by several factors, including variation in soil temperature, seeding depth, residue distribution, soil crusting, and soil moisture, etc. Iowa producers dealt specifically with variable soil temperatures this year, which have now caused ..., Oats are a cool season crop and yield best when planted in late March to April 15 so that flowering occurs before the hot part of the summer. Grain yields drop about 10-15% per week after April 15 in the central part of the state. So any oats yet to be seeded should be done as soon as soil conditions permit., LAS VEGAS, Sept. 22, 2020 /PRNewswire/ -- Doc's Sports Service is the most successful sports information and handicapping service in the world. Do... LAS VEGAS, Sept. 22, 2020 /PRN..., Apr 23, 2018 ... Optimum planting date windows to obtain at least 98% yield potential range from April 15-May 9 for northwest and cental Iowa; from April 17-May ..., Sustained soil temperatures of at least 50 degrees are necessary for corn seed to reliably sprout, but those temperatures have lagged in the 40s for much of the planting season so far. On Sunday, most of the southern half of Iowa was averaging soil temps of about 50 degrees, whereas parts of far northern Iowa were in the low-to-mid …, Soil temperatures under other ground covers or under bare ground will vary somewhat from those shown here. More information on soil temperatures, including current conditions can be found on the WARM site. Table 1. Average soil temperature at 4 and 8 inches at each site. 4-Inch Depth 8-Inch Depth; Belleville: Plot: Plot ..., When it comes to finding a reliable and trustworthy Chevrolet dealership in Mapleton, Iowa, look no further than Macs Chevrolet. With a wide selection of vehicles and exceptional c..., Soil Moisture and Temperatures We have soil sensors buried in the ground at the levels indicated below. Each level has a temperature probe and a moisture sensor. Moisture is measured in ' cb ' with range of 0 to 200 with 0 being totally saturated and anything over 100 being extremely dry., Soil Temperatures. Data from the Iowa State Soil Moisture Network is found on this website and daily soil temperature averages are used to produce the highlighted analysis. Precipitation. More Precipitation Maps. Current Data. The IEM combines data from participating networks into products like maps shown above and web applications to …, Crabgrass ( Digitaria spp.) is an annual, warm-season grass. Crabgrass seeds begin to germinate when soil temperatures reach 55 degrees Fahrenheit. Germination usually begins about mid-April in southern Iowa, early May in northern parts of the state. Crabgrass continues to germinate over several weeks from spring into summer.