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Water Survey

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  • February: More Rain, Less Snow

    Mar 3, 2009 8:00 pm

    February statewide precipitation averaged 2.45 inches, 0.52 inches above normal. Ft. Massac State Park reported the highest monthly precipitation total of 6.03 inches, according to State Climatologist Jim Angel of the Illinois State Water Survey 

  • February Tornadoes Are Rare But Violent

    Mar 1, 2012 8:15 pm

    Harrisburg, Illinois was struck by a deadly tornado on February 29, leading to six reported deaths and widespread damage. While more common during spring and summer in Illinois, tornadoes sometimes occur in February, said Illinois State Climatologist Jim Angel of the Illinois State Water Survey, University of Illinois at Urbana-Champaign.

  • Rock Island county map of structure-based flood risk assessment

    FEMA honors Water Survey and Illinois Department of Natural Resources

    May 18, 2021 3:00 pm

    The Illinois State Water Survey and the Office of Water Resources in the Illinois Department of Natural Resources took first place in FEMA’s 2021 National Cooperating Technical Partner Recognition Award for their statewide efforts to assess flood risk at the individual property level. 

  • map of Illinois flood insurance rate map status by county

    FEMA recognizes Water Survey's significant contributions as a Cooperating Technical Partner

    Mar 15, 2021 8:30 am

    The Federal Emergency Management Agency recently praised the Water Survey’s accomplishments as a Cooperating Technical Partner, including improving the flood mapping process in Illinois and developing accurate, easily accessible flood data for every county in Illinois. 

  • Fifth Warmest November and Second Warmest Fall in Illinois

    Dec 2, 2016 4:30 pm

    November 2016 was the 5th warmest November on record for Illinois, according to Illinois State Climatologist Jim Angel, Illinois State Water Survey, University of Illinois.

    This year also had the 2nd warmest fall (September, October, and November) on record for Illinois. 

  • Fifth Wettest Spring on Record

    Jun 3, 2009 11:15 am

    Wet conditions in March, April, and May resulted in 15.9 inches of rain, 4.5 inches above normal and the fifth wettest spring since statewide records began in 1895. May precipitation was 6.0 inches, 1.7 inches above normal and the 19th wettest May on record, according to State Climatologist Jim Angel of the Illinois State Water Survey (http://www.isws.illinois.edu).

  • Flood Terminology Can be Misleading

    Apr 2, 2009 7:00 pm

    We have heard the term "500-year flood" often in the news these days, and yet these extremely rare events seem to occur too frequently. Just last week, Fargo, ND experienced record flooding only 12 years after the 500-year flood in 1997.

    The problem is, people often have a misconception about flood-related terms, according to Jim Angel, state climatologist at the Illinois State Water Survey (ISWS), University of Illinois at Urbana-Champaign

  • Fourth Warmest Spring in Illinois

    Jun 11, 2010 1:15 am

    Based on preliminary data, the statewide average temperature for spring in Illinois was 55.3 degrees, 3.3 degrees above normal and the fourth warmest spring on record. Warmer than normal conditions prevailed in all three spring months of March (2.5 degrees above), April (6.2 degrees above), and May (1.3 degrees above), according to State Climatologist Jim Angel of the Illinois State Water Survey (http://www.isws.illinois.edu).

  • Fourth wettest February-March on record in Illinois

    Apr 3, 2018 2:30 pm

  • Free Online Program Educates Homeowners with Water Wells

    Nov 19, 2012 7:30 pm

    Homeowners in small communities and rural areas without a public water supply often don’t fully understand how to manage, operate, and protect their private well.

  • Future Groundwater Supplies are a Concern for Growing Illinois Communities

    Aug 24, 2009 10:00 am

    Population growth may be an economic boon for communities and counties, but the subsequent increased water demand could threaten the amount and quality of public water supplies available within the next few decades, according to Scott Meyer, hydrogeologist at the Illinois State Water Survey, a division of the Institute of Natural Resource Sustainability at the University of Illinois.

  • GIS topographic view

    GIS topographic tool is applied statewide

    Apr 15, 2020 8:30 am

    The Water Survey uses a GIS analysis tool called the Topographic Wetness Index to identify low-lying areas that could be subject to ponding during rain events. The index is particularly important because areas of low terrain with upslope—conditions that contributes to drainage areas—can be spotted outside of the Federal Emergency Management Agency’s mapped floodplain areas.

  • Gov. Rauner appoints ISWS scientist George Roadcap to Mahomet Aquifer Task Force

    Dec 22, 2017 2:45 pm

    Illinois State Water Survey hydrogeologist George Roadcap is among those appointed to the Mahomet Aquifer Task Force, which has been charged with protection of the Mahomet Aquifer, a primary source of drinking water for 500,000 Central Illinois residents.

  • Groundwater Awareness Week: March 10-16, 2013

    Mar 1, 2013 2:45 am

    In the spring, just before peak water use season begins, is a good time to check that your water well is working properly and that your water is safe to drink, according to Walt Kelly, interim head of the Center for Groundwater Science at the Illinois State Water Survey (ISWS), University of Illinois.

  • Leaves turn at Volo Bog Nature Preserve in the fall. Photo credit: Bill Batalden

    Groundwater experts help industries and nature preserves thrive

    Jul 7, 2022 8:00 am

    ISGS and ISWS began monitoring the intersections between industry and the state-protected nature preserves in 1998, letting science and groundwater testing lead the way. Then-graduate student Randy Locke embarked on what was intended to be a two-year groundwater monitoring project; that project is now in its 24th year and has expanded to 414 dedicated nature preserves across 62,270 acres in Illinois.

  • Groundwater hydrologist is honored for contributions to the water operating profession

    Jan 22, 2020 11:00 am

    Illinois State Water Survey (ISWS) groundwater hydrologist Steve Wilson has received an Association of Boards of Certification’s award for advancing the water and wastewater operating profession. The Kenneth D. Kerri Excellence in Workforce Development Award was presented to Wilson for going beyond the call of duty as an educator.

  • Groundwater is plentiful for water supplies in future years, but surface water may be lacking, especially for Springfield, putting East-Central Illinois communities at risk for water shortages in a serious drought, according to George Roadcap, Hydrogeologist with the Illinois State Water Survey (ISWS) in the Prairie Research Institute at the University of Illinois at Urbana-Champaign.Study Identifies Cities Where Water Shortages May be a Future Issue in East-Central Illinois

    Feb 14, 2012 8:30 pm

    Groundwater is plentiful for water supplies in future years, but surface water may be lacking, especially for Springfield, putting East-Central Illinois communities at risk for water shortages in a serious drought, according to George Roadcap, Hydrogeologist with the Illinois State Water Survey (ISWS) in the Prairie Research Institute at the University of Illinois at Urbana-Champaign.

  • Corn field and blue sky

    Growing degree day calculator provides site-specific weather data

    Sep 2, 2020 9:00 am

    The Illinois State Water Survey (ISWS) growing degree day (GDD) calculator is updated daily through local weather stations for users to calculate projections on crop development and maturity specifically for their location.

  • Heavy Rain in Southern Illinois Results in Widespread Flooding

    Mar 19, 2008 7:15 pm

    A storm system moving slowly through southern Illinois since March 17 has produced rainfall totals that have already exceeded 8 inches in some places south of Interstate 70, according to State Climatologist Jim Angel of the Illinois State Water Survey (http://www.sws.uiuc.edu), a division of the Illinois Department of Natural Resources.

  • Heavy Rains Strike Parts of Illinois in May

    Jun 2, 2016 7:45 pm

    The statewide average precipitation for May was 4.52 inches, just 0.08 inches below normal. However, heavy rains struck parts of Illinois, causing flooding. Some areas received up to 10 inches of precipitation by the end of the month, according to Illinois State Climatologist Jim Angel at the Illinois State Water Survey, University of Illinois.

  • High Arsenic Levels in Well Water are Scattered Across Tolono Area

    Sep 6, 2011 9:15 pm

    Illinois State Water Survey (ISWS) findings of a study on arsenic in drinking water from wells near Tolono, IL showed no discernable pattern of elevated arsenic levels except in the small subdivision south of Tolono where the safe drinking water issue was initiated, according to Walt Kelly, ISWS groundwater geochemist.

  • High-density Network Measures Incredible Differences in Recent Heavy C-U Rains

    Jun 27, 2007 7:00 pm

    A high-density raingage network identified large differences in rainfall amounts from June 26-27 storms across Champaign County, Illinois. Amounts ranged from 2.58 inches just west of the I-57/I-72 interchange (west of Champaign) to less than 0.20 inch (southeast Urbana).

  • Higher soil temperatures this winter foretell potential crop pest problems

    Mar 5, 2024 3:15 pm

    Winter 2023-24 has been warm throughout Illinois, creating conditions ripe for insects to overwinter, according to scientists at the Prairie Research Institute (PRI) at the University of Illinois.  

  • Hot and stormy end to summer

    Sep 2, 2021 8:15 am

    August temperatures were largely above normal across Illinois. Because of the heat and humidity, August precipitation was accompanied by frequent severe weather events including several tornadoes, hail, and strong winds.

  • Eric R. Larson and Sally McConkey standing in the U. of I.’s Red Oak Rain Garden. Photo by Fred Zwicky

    How do we measure community disaster resilience?

    Aug 12, 2022 8:15 am

    In a new study, retired Illinois State Water Survey engineer Sally McConkey and Eric R. Larson, a professor of natural resources and environmental sciences, examined the metrics used at a county scale for national assessments to determine whether communities are prepared to withstand and recover from natural disasters such as floods and fires. 

  • Illinoisans experienced bone-chilling weather changes in October

    Nov 2, 2018 11:30 am

    The Illinois weather in October 2018 dished up a mixed bag of conditions with temperatures in the 90s, the first fall frost, the first snow of the season, and widespread heavy rains, according to Illinois State Climatologist Jim Angel at the Illinois State Water Survey.

  • Illinoisans Experience Spring-like Weather in January

    Jan 9, 2008 7:15 pm

    On January 7, winter weather gave way to spring-like conditions with record-breaking warmth, heavy rains, and severe weather across Illinois. Record high temperatures were set at several locations, including Peoria (67 degrees), Chicago (65 degrees), and Champaign (67 degrees), according to State Climatologist Jim Angel of the Illinois State Water Survey (http://www.sws.uiuc.edu), a division of the Illinois Department of Natural Resources.

  • Illinois April temperatures were a roller coaster of highs and lows

    May 2, 2023 10:15 am

    April gave Illinoisans a taste of summer in the first half of the month, only to revert to winter-like conditions in the last week of the month. Overall, average temperatures were slightly above normal in April and precipitation was nearly 1.5 inches below normal with a record-setting dry week, according to Illinois State Climatologist Trent Ford at the Illinois State Water Survey.

  • metal rain gage standing in field of brown plants

    Illinois Climate Network marks 30 years of monitoring Illinois weather and soil

    Jan 31, 2019 10:45 am

    It’s been 30 years since the Illinois State Water Survey launched the Illinois Climate Network (ICN) to monitor the state’s weather and soils. The 19 ICN stations around the state collect data on wind speed and direction, air temperature, humidity, precipitation, barometric pressure, solar radiation, soil temperatures and soil moisture. Water Survey staff also calculate data on dew point, degree days, potential evapotranspiration, and temperature inversion. All of this information—an annual total of 2 million records—is used by farmers, researchers, and businesses for decision making and planning.

  • Illinois drought and soil moisture conditions worsen in mid-June

    Jun 15, 2023 10:00 am

    Northeastern and central Illinois are now experiencing severe drought, as dry conditions persist across the state in the second week of June, causing soil moisture levels to drop and record-low water levels in some areas of the Illinois River. Also, corn and soybeans in parts of southwestern, central, and northeastern Illinois are showing signs of slow growth, according to Illinois State Climatologist Trent Ford and Jennie Atkins, Water and Atmospheric Resources Monitoring (WARM) program manager at the Illinois State Water Survey.

  • Illinois drought impacts continue into the fall

    Sep 14, 2023 2:30 pm

    Drought intensified again in Illinois at the end of the growing season, increasing the risk of fire and blowing dust as harvest approaches. River levels have also dropped near or below low stage, leading to navigation concerns.

  • Illinois Farm Bureau highlights vital stats available from WARM

    Dec 15, 2017 2:45 pm

    Wind speed, precipitation, soil temperatures and pest degree days. Farmers can get those vital statistics and more from the Water and Atmospheric Resources Monitoring Program (WARM). More than 150,000 visitors--farmers, governmental agencies, industry and academics--regularly check the website at isws.illinois.edu/warm.

  • Illinois groundwater resources interactive map

    Jul 18, 2016 11:30 am

    Illinois has an abundance of groundwater resources that supply millions of gallons of water per day to public, irrigation, and commercial/industrial systems. Groundwater resources are unevenly distributed throughout Illinois due to the state’s complex bedrock and glacial geology. This interactive map depicts the three major aquifer systems in Illinois and the public water supply (PWS) wells that extract groundwater from them. Users can select or query wells based on spatial location or attribute, and then can view reported withdrawals in an attribute table or in graph view. Users can also export data found in the attribute tables as a CSV file and can output maps in various formats for printing.

  • Illinois Had the Warmest Spring on Record

    Jun 1, 2012 7:45 pm

    Spring in Illinois-March, April, and May-was the warmest on record dating back to 1895, according to State Climatologist Jim Angel of the Illinois State Water Survey.

  • Illinois Has a Cool, Dry August

    Sep 1, 2017 2:30 pm

    August was cool across the state and dry in most places in Illinois, capping off a summer that was cool and wet, according to Illinois State Climatologist Jim Angel, Illinois State Water Survey, University of Illinois.

  • Soybeans ready for harvest

    Illinois has cooler, wetter soils in mid-September

    Sep 17, 2020 8:00 am

    Soil temperatures have cooled the first half of September. Wetter weather the past two weeks has led to increases in soil moisture for northern and central Illinois. 

  • Illinois has dry soils in mid-September

    Sep 18, 2017 2:00 pm

    Illinois received 0.20 inches of rain for the month as of September 17, 1.59 inches below the long-term average. Dry weather in August and September has led to low soil moisture across Illinois.

  • Illinois has Four Odd Tornado Seasons in a Row

    Mar 25, 2015 3:00 pm

    The 2015 tornado season thus far in Illinois and the rest of tornado alley is incredibly quiet. However, this quiet start is no reason to relax if the past few years are a guide, according to Illinois State Climatologist Jim Angel at the Illinois State Water Survey, University of Illinois.

  • Illinois Has Fourth Wettest Year on Record

    Jan 5, 2010 1:45 am

    Based on preliminary data in Illinois, the statewide average precipitation for 2009 was 50.3 inches, 11 inches above normal. This was the fourth wettest year on record for the state based on data going back to 1895, according to State Climatologist Jim Angel of the Illinois State Water Survey

  • Illinois has Warmer, Drier Soils in Mid-April

    Apr 18, 2016 8:15 pm

    Warmer weather in the second week of April brought warmer and drier soils, according to Jennie Atkins, Water and Atmospheric Resources Monitoring (WARM) Program manager at the Illinois State Water Survey, Prairie Research Institute, University of Illinois.

  • Illinois has warm, wet June

    Jul 2, 2018 2:00 pm

  • Illinois in 2012: Second Warmest and Tenth Driest on Record

    Jan 2, 2013 2:00 am

    The year 2012 will long be remembered for the drought and the exceptionally warm temperatures. While the data for December are still preliminary, 2012 was the second warmest and tenth driest year on record for Illinois, according to Illinois State Climatologist Jim Angel of the Illinois State Water Survey at the University of Illinois.

  • Illinois’ June weather was hotter and drier than average

    Jul 5, 2022 9:45 am

    June temperatures in Illinois were above normal with a prolonged heat wave mid-month, according to Illinois State Climatologist Trent Ford at the University of Illinois’ Illinois State Water Survey. The rainfall was below normal for June.

  • Illinois’ mild winter might benefit insect pests this spring

    Mar 9, 2023 2:45 pm

    Above normal air temperatures this winter kept Illinois average soil temperatures higher than usual. These mild conditions are favorable for insect pests that overwinter in Illinois, but many other factors will affect insect populations for the upcoming growing season, according to scientists at the Prairie Research Institute (PRI), a part of the University of Illinois.

  • Illinois soil conditions are hot and dry in June

    Jun 17, 2021 1:45 pm

    Warmer weather has led to higher than normal soil temperatures for Illinois in June.

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    Illinois’ soils are cooler and drier in mid-April

    Apr 17, 2020 9:00 am

    Colder weather entering Illinois has caused soil temperatures to fall, according to Jennie Atkins, Water and Atmospheric Resources Monitoring (WARM) program manager at the University of Illinois’ Illinois State Water Survey.

  • Illinois soils are cooler and drier in mid-September

    Sep 14, 2023 2:15 pm

    Cooler weather in the past week has led to lower soil temperatures throughout the state in mid-September.


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    Illinois soils are cooler and wetter in mid-June

    Jun 18, 2019 8:45 am

    Soil temperatures are increasing after a cooling period the second week of June, according to Jennie Atkins, Water and Atmospheric Resources Monitoring (WARM) Program manager at the Illinois State Water Survey, University of Illinois.

  • Illinois soils are cooler in mid-August

    Aug 16, 2022 4:00 pm

    Cooler weather has led to lower soil temperatures in the first half of August in Illinois, according to Jennie Atkins, Water and Atmospheric Resources Monitoring (WARM) program manager at the Illinois State Water Survey.

  • Illinois soils are cooling in the first half of October

    Oct 18, 2023 9:30 am

    Soil temperatures have fallen 10 to 20 degrees so far in October, which is normal for this time of year.