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  • Corn stalks in summer

    Climatologist: Vegetation plays a role in developing flash droughts

    Farmland vegetation and grasses can affect both the frequency and extent of flash droughts, say scientists at the Illinois State Water Survey (ISWS), who hope to better understand the phenomenon and improve early warnings.

  • Cold, dry December ends a warm year in Illinois

    The statewide average temperature for December was 28.6 degrees, 1.3 degrees below normal, according to Illinois State Climatologist Jim Angel, Illinois State Water Survey, University of Illinois.

  • Coldest July on Record for Illinois

    Based on preliminary data for Illinois, the statewide average temperature for July was 70.4 degrees, 5.3 degrees below normal. This ranks as the coldest July in the statewide records and a degree colder than the previous record set in 1924 (71.5 degrees), according to State Climatologist Jim Angel of the Illinois State Water Survey (http://www.sws.uiuc.edu).

  • Cold February Wraps Up Cold Winter

    Based on preliminary data in Illinois, the statewide average temperature for February was 25.1 degrees, 5.1 degrees below normal. Snowfall for February was above normal. Amounts ranged from 6 inches in southern Illinois to over 18 inches in the Quad Cities and Chicago areas, according to State Climatologist Jim Angel of the Illinois State Water Survey 

  • Cold January for Illinois

    January 2014 was the eighth coldest January on record for Illinois. The statewide average temperature was 18.2 degrees, 8.1 degrees below the 1981-2010 average of 26.3 degrees, according to Illinois State Climatologist Jim Angel at the Illinois State Water Survey, University of Illinois.

  • light frost on fall leaves

    Cold November brings an end to meteorological autumn

    November temperatures were well below the long-term average across the state, breaking hundreds of local daily records. The preliminary statewide November average temperature was 35.6 degrees, about 7 degrees below our 30-year normal and tied for the ninth coldest on record.

  • Cold, Snowy March for Illinois

    The statewide average temperature for March was 38.2 degrees, 3.1 degrees below average, according to Illinois State Climatologist Jim Angel, Illinois State Water Survey, University of Illinois.

  • Cool, Dry August for Illinois

    August statewide precipitation was below normal, ending an eight-month streak of above-normal precipitation in Illinois that began in December 2007, according to State Climatologist Jim Angel of the Illinois State Water Survey (http://www.sws.uiuc.edu).

  • Cool, Dry November Finishes with First Major Snow of the Season

    November in Illinois was both cooler and drier than normal. However, a low-pressure system at the end of the month brought the first significant snowfall of the season across northern and central Illinois, according to State Climatologist Jim Angel of the Illinois State Water Survey (http://www.isws.illinois.edu).

  • Cooler soil temperatures in mid-April

  • Cooler than Normal July Prevails

    "Statewide July temperatures averaged 73.5°F, 2.3°F below normal, and the 20th coolest July since 1895. While we had some hot days, Illinois generally managed to avoid the heat wave experienced out West during July," says State Climatologist Jim Angel of the Illinois State Water Survey (http://www.sws.uiuc.edu), a division of the Illinois Department of Natural Resources.

  • Cooler, Wetter Soils in Mid-May

    Soils were wetter and cooler than average over most of Illinois in mid-May, according to Jennie Atkins, Water and Atmospheric Resources Monitoring (WARM) Program manager at the Illinois State Water Survey, Prairie Research Institute, University of Illinois.

  • Cool fall temperatures continued in October

    October was much cooler than average across Illinois, 2.6 degrees below the 30-year normal for the month, according to Illinois State Climatologist Trent Ford at the University of Illinois’ Illinois State Water Survey. The preliminary statewide average October temperature was 51.8 degrees.

  • May was cool and wet in Illinois

    Cool, wet May ends wet spring

    May was much colder and moderately wetter than average across Illinois, bringing an end to a wet climatological spring season. The preliminary statewide average May temperature was 60.5 degrees, 2.2 degrees below the 30-year normal and the 39th coldest on record. Preliminary statewide average total precipitation for May was 5.41 inches, 0.81 inches wetter than the 30-year normal and the 25th wettest on record.

  • Cool, Wet Summer in Illinois

    Based on preliminary data for Illinois, this was the 11th coolest and 8th wettest summer since statewide records began in 1895. The average temperature for June–August was 71.4 degrees, 2.4 degrees below normal. The total precipitation for June–August was 15.2 inches, 3.6 inches above normal, according to State Climatologist Jim Angel of the Illinois State Water Survey 

  • Cool, Wet Weather Slows Northern and Central Illinois Planting

    "Combined with cooler temperatures, wet April conditions led to widespread corn planting delays in the northern two-thirds of the state, where precipitation averaged 4.05 inches (0.46 inches above normal) and up to 5–7 inches at some locations. April temperatures averaged 49.5°F statewide (2.7°F below normal), and statewide precipitation was 3.75 inches (just 0.05 inches below normal), based on preliminary data. Southern Illinois was drier, averaging 3.38 inches (0.74 inches below normal), and planting there is further along," says State Climatologist Jim Angel of the Illinois State Water Survey (http://www.sws.uiuc.edu), a division of the Illinois Department of Natural Resources.

  • corn fields

    Corn fields add to muggy, humid Midwestern temps

    It’s not just the heat; it’s the humidity and “corn sweat” making muggy Midwestern summers feel even hotter.

  • December 2010 in Illinois–Cold and Snowy

    The statewide average temperature for December was 24.0 degrees, which is 5.8 degrees below normal. This ranks as the 12th coldest December on record, according to State Climatologist Jim Angel of the Illinois State Water Survey (http://www.isws.illinois.edu).

  • December 2021 was exceptionally warm

    Provisional data show December was among the top 5 warmest on record in Illinois, with no snow on Christmas.

  • frost on evergreen branch

    December brought warm and dry weather to end 2020

  • December Finished Cold in Illinois

    In December, the statewide temperature of 25.5 degrees was 4.4 degrees below average, making it the 20th coldest December on record since 1895. However, it is far short of the record coldest December of 1983 when the statewide temperature was only 17.1 degrees, 8.4 degrees colder than this December, according to Illinois State Climatologist Jim Angel at the Illinois State Water Survey, Prairie Research Institute, University of Illinois.

  • December in Illinois: Tornadoes, warm temperatures, and little snow

    With warmer than average temperatures, December 2018 brought slight snowfall and a historic late-season severe weather outbreak to Illinois.

  • December in Illinois: Warm with Little Snow

    The statewide average temperature for December 2011 in Illinois was 35.7 degrees, 5.9 degrees above average. This ranked as the ninth warmest December on record with statewide records going back to 1895, according to Illinois State Climatologist Jim Angel of the Illinois State Water Survey, University of Illinois at Urbana-Champaign.

  • Demissie Named Director of Illinois State Water Survey

    The Institute of Natural Resource Sustainability (INRS) at the University of Illinois at Urbana-Champaign has named Mike Demissie, head of the Center for Watershed Science at the Illinois State Water Survey (ISWS), as new director of the Survey.

  • Drying, warming soils across Illinois

    Soils are drying out after the early September rain, according to Jennie Atkins, Water and Atmospheric Resources Monitoring (WARM) Program manager at the Illinois State Water Survey, University of Illinois.

  • Early Warmth in 2012 and the Climatology of the Last Spring Freeze in the Midwest

    With warm weather seemingly stationary across the Midwest, many people are wondering if we have seen the last of freezing temperatures.  Climatology tells us that there is still the possibility for a late freeze, according to the Midwestern Regional Climate Center at the Illinois State Water Survey (ISWS).

  • El Niño and the Midwest

    What effect could El Niño have on winter in the Midwest and the rest of the United States? Find out on the new El Niño webpage from the Midwestern Regional Climate Center (MRCC), located at the Illinois State Water Survey (ISWS). (http://mrcc.isws.illinois.edu/mw_climate/elNino/index.jsp)

  • El Niño Not Likely to Affect First Fall Freeze

    A developing El Niño in the Pacific Ocean will likely not affect the first freeze this fall in the Midwest, according to Steve Hilberg, Director of the Midwestern Regional Climate Center at the Illinois State Water Survey (ISWS), University of Illinois.

  • End-of-June Rainfall Provides Remarkable Transformation

    "The most outstanding feature of June weather was the change from very dry conditions the first 18 days to very wet ones the rest of the month. As a result, crops, lawns, and gardens recovered quickly from abnormally dry conditions that began in May," says State Climatologist Jim Angel of the Illinois State Water Survey (http://www.sws.uiuc.edu), a division of the Illinois Department of Natural Resources. Statewide June precipitation in Illinois was 4.47 inches (0.39 inches above normal), and statewide temperatures were 72.7°F degrees (0.8°F above normal). "That's quite a switch from the first 18 days of June, only 1.03 inches statewide, less than half the 2.42-inch normal for that period. The last 12 days of June had 3.44 inches, about twice the 1.66-inch normal," says Angel.

  • Fall 2011 Precipitation in the Midwest: From Shortage in the West to Surplus in the East

    In the Midwest during the fall of 2011, precipitation was plentiful in the eastern Midwest but scarce in western parts of the region (meteorological fall is September through November), according to the Midwestern Regional Climate Center at the Illinois State Water Survey (ISWS).

  • Fall Brings Near-Record Warmth to the Midwest

    Warm conditions blanketed the Midwest during the 2015 fall season (September-October-November), bringing near-record seasonal and monthly temperatures, according the Midwestern Regional Climate Center (http://mrcc.isws.illinois.edu/), Illinois State Water Survey (ISWS).

  • Farmers Must Adapt to Climate Changes in Illinois

    Farmers who keep an eye on the sky and an ear tuned to the local weather report will also want to pay attention to long-term climate change trends which may sway production decisions down the road.

  • February breaks record for warm temperatures in Illinois

    February was the warmest February on record for Illinois, according to State Climatologist Jim Angel at University of Illinois’ Illinois State Water Survey.

  • February in Illinois was Slightly Warmer than Normal

    The Illinois temperature for February was 33.2 degrees, 2.3 degrees above average, according to Illinois State Climatologist Jim Angel, Illinois State Water Survey, University of Illinois.

  • February: More Rain, Less Snow

    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

    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

    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

    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

    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

    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

    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

    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

  • Free Online Program Educates Homeowners with Water Wells

    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

    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

    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

    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

    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.

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

    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

    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.