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Water Survey

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  • May brought a cool end to a warm spring

    Jun 2, 2021 8:15 am

    May temperatures varied substantially across Illinois, with an average temperature 2.5 degrees below the 30-year normal, according to Illinois State Climatologist Trent Ford at the University of Illinois’ Illinois State Water Survey.

  • May brought spring and a taste of summer to Illinois

    Jun 2, 2022 11:00 am

    Illinois temperatures in May varied from periods of below average to periods of far above average, breaking records across the state, according to Illinois State Climatologist Trent Ford at the University of Illinois’ Illinois State Water Survey. Rainfall was slightly below normal in May statewide.

  • May in Illinois: Warmer Than Average, Dry in the West

    Jun 2, 2014 4:00 pm

    The statewide average temperature for May in Illinois was 63.9 degrees F, which is 1.2 degrees above average. This is the first month for temperatures to be above average in Illinois since October 2013, according to Illinois State Climatologist Jim Angel, Illinois State Water Survey, University of Illinois.

  • May Was Warm and Wet in Illinois

    Jun 1, 2015 2:45 pm

    Despite cool weather at times, May was 2.3 degrees above average on temperature and 1 inch above average on rainfall, according to Illinois State Climatologist Jim Angel, Illinois State Water Survey, University of Illinois.

  • McConkey joins U of I group on building resilience to climate change

    Sep 11, 2019 9:30 am

    Professional engineer Sally McConkey has joined the Institute for Sustainability, Energy, and Environment’s (iSEE) new Resilience Working Advisory Team (RWAT) to foster resilience to the local effects of climate change.

  • Walton R. Kelly, John Scott, Nancy Holm, Wei Zheng and Samuel V. Panno

    Microplastic contamination found in common source of groundwater

    Jan 25, 2019 7:45 am

    A new study by PRI scientists is the first to report microplastics in fractured limestone aquifers – a groundwater source that accounts for 25 percent of the global drinking water supply.

  • Mid-September soils across Illinois were warmer and drier than normal

    Sep 17, 2021 9:15 am

    Soils remained warm in mid-September because of hotter than normal weather across Illinois. 

  • Midwest Experiences Warmest and Wettest December on Record

    Jan 6, 2016 10:30 pm

    In a year when many state records were broken, 2015 ended with historically warm temperatures and well above-normal precipitation, leading to the warmest and wettest December on record for the Midwest, according to the Midwestern Regional Climate Center (MRCC) at the Illinois State Water Survey (ISWS).

  • Midwest Heavy Rain and Flooding is Compared to 1993 Flood

    Jun 13, 2008 12:00 am

    The recent heavy rain in the Midwest and flooding in Illinois, Indiana, Iowa, Wisconsin, Minnesota, and Missouri are drawing comparisons with the weather and events associated with the Great Flood of 1993 on the Mississippi River, according to Steve Hilberg, director of the National Oceanic and Atmospheric Administration (NOAA) Midwestern Regional Climate Center (MRCC) at the Illinois State Water Survey. Climatologists there have compared 2008 weather events with what occurred in 1993 to place the current situation in perspective.

  • Midwest Regional Climate Center Announces Free Online Climate Data Tools Environment

    Oct 10, 2013 1:45 am

    The Midwestern Regional Climate Center (MRCC) is announcing the launch of a new online climate data system where registrants can access climate data and other value-added products for free!

  • Midwest Sets Record Cold Temperatures in July

    Aug 4, 2009 11:15 am

    This was the coldest July on record for the nine-state Midwest region, based on preliminary temperature data. The average temperature for the region was 68.0 degrees, 4.7 degrees below normal. The previous record was 68.9 degrees in 1992, according to Mike Timlin, Regional Climatologist with the NOAA Midwestern Regional Climate Center (http://mrcc.isws.illinois.edu).

  • Mild February wraps up a weak winter

    Mar 2, 2023 4:45 pm

    February in Illinois was particularly mild, ending a winter season that was 2 to 6 degrees above normal, according to Illinois State Climatologist Trent Ford at the University of Illinois’ Illinois State Water Survey. February also brought wetter weather to the state.

  • Mild March was quite a contrast to February

    Apr 2, 2021 8:30 am

    The preliminary statewide average March temperature was 45.9 degrees, 4.5 degrees above the 1991–2020 average and the 13th warmest on record going back to 1895. Preliminary statewide average total March precipitation was 4.10 inches, 1.16 inches above the 1991–2020 average and the 30th wettest on record going back to 1895.  

  • Agricultural field with young green plants in rows stretching back to the horizon.

    Mild May wraps up otherwise warm spring in Illinois

    Jun 16, 2025 12:30 pm

    Despite milder May temperatures, the spring season was still a top 10 warmest on record in many places in the Midwest, including in St. Louis, Peoria, and Paducah, according to Illinois State Climatologist Trent Ford at the Prairie Research Institute.

  • Mild, wet start to winter

    Jan 8, 2025 8:00 am

    Day to day temperature variability in Illinois is highest in climatological winter and December followed suit with regular dips and jumps in daily temperature, according to Illinois State Climatologist Trent Ford at the University of Illinois’ Illinois State Water Survey.

  • Mild Winter Leads to Warmer Soil Temperatures

    Feb 27, 2012 8:15 pm

    The mild winter weather has led to higher soil temperatures in comparison to last winter based on temperatures collected at weather stations across the state, according to Jennie Atkins, Water and Atmospheric Resources Monitoring (WARM) Program Manager at the Illinois State Water Survey.

  • Model Stormwater Ordinance is Now Available for Communities

    Nov 23, 2015 2:15 pm

    Flooding in urban areas from stormwater runoff may be mitigated when state and local governments plan a coordinated effort to reduce their risk. The Illinois State Water Survey (ISWS) and the Illinois Department of Natural Resources (IDNR) offered their support to communities by developing a model ordinance that city and county officials can use when revising or drafting their own stormwater ordinances.

  • momcilo markus

    Momcilo Markus named Head of the Watershed Science Section

    Jun 21, 2023 3:15 pm

    Markus specializes in hydrological forecasting and artificial neural networks. His work on the effects of climate change and urbanization on water resources, statistical evaluation of streamflow and water quality networks, stochastic modeling for load estimation, data mining, and hydrologic flood frequency analyses has contributed to the development of the National Weather Service River Forecast System.

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    Most of Illinois has warmer, drier soils in mid-September

    Sep 17, 2019 9:00 am

    Warmer weather has caused higher than normal soil temperatures for Illinois, according to Jennie Atkins, Water and Atmospheric Resources Monitoring (WARM) Program manager at the University of Illinois’ Illinois State Water Survey.

  • MRCC Climatologist Appointed to World Meteorological Organization Expert Task Team

    Dec 20, 2011 8:00 pm

    Nancy Westcott, research climatologist at the Midwestern Regional Climate Center (MRCC), was recently appointed as the North American representative to the Task Team on Climate Data Rescue, initiated by the World Meteorological Organization's Commission for Climatology.

  • National Groundwater Awareness Week: March 11–17, 2012

    Mar 1, 2012 8:15 pm

    About half the U.S. population receives its drinking water from wells. Many cities in Illinois, including Champaign-Urbana, Normal, and most of the western and southern suburbs of Chicago, get some or all of their drinking water from groundwater sources.  In addition, almost all rural residents use groundwater. During National Groundwater Awareness Week, we want to promote stewardship of this important resource, to protect and conserve it.

  • National Groundwater Awareness Week: March 8–14, 2015

    Feb 27, 2015 3:15 pm

    About half the U.S. population receives its drinking water from wells. Many cities in Illinois, including Champaign-Urbana, Normal, and most of the western and southern suburbs of Chicago, get some or all of their drinking water from groundwater sources. In addition, almost all rural residents use groundwater. During National Groundwater Awareness Week, we want to promote stewardship of this important resource, to protect and conserve it.

  • National Science Foundation funds project to improve weather forecasts for cities

    Feb 23, 2022 12:00 pm

    Scientists at the Illinois State Water Survey (ISWS) have begun a new project that will ultimately improve weather forecasting of severe storms and heatwaves in cities across the US.

  • Near-Normal August after a Hot and Dry Summer for Illinois

    Aug 31, 2012 7:45 pm

    After months of exceptionally warm temperatures and drought, Illinois finally experienced temperatures and precipitation closer to normal in August, according to Illinois State Climatologist Jim Angel at the Illinois State Water Survey, University of Illinois.

  • Near-surface soil temperatures and moisture levels are declining in mid-April

    Apr 16, 2021 11:30 am

    Colder weather in the second week of April has caused soil temperatures to decline in Illinois.

  • Network now monitors air temperature inversions in several locations

    May 14, 2018 8:30 am

  • New collaboration with the United Kingdom Focuses on water challenges

    Jan 13, 2013 2:00 am

    The Illinois State Water Survey (ISWS) at the Prairie Research Institute, University of Illinois, has signed a memorandum of understanding to collaborate on water-related projects with faculty at the Water@Leeds Research Centre, University of Leeds in the United Kingdom.  This collaboration will focus on topics such as climate change, water quality and supply, flooding, drought, and regulatory issues.

  • New Homeowners' To-Do List Should Include Well Water Testing

    Apr 26, 2016 8:00 pm

    Looking for that special house in the country?  Don't forget to have the well tested to ensure safe drinking water, advises Steve Wilson, groundwater hydrologist at the Illinois State Water Survey, University of Illinois.

  • New Nanosensor Detects Leaky Water Pipes

    Feb 26, 2010 1:45 am

    Combining the latest nanotechnology with hydraulics may yield a promising solution to the costly problem of leaking water pipes in community public water systems, according to Yu-Feng Lin, a hydrologist at the Illinois State Water Survey, University of Illinois.

  • New online county maps highlight flood hazard areas in Illinois

    Feb 8, 2008 7:15 pm

    Illinois State Water Survey (ISWS) engineers are bringing county floodplain maps into the 21st century, from two-dimensional paper products to digital illustrations using the latest geographical software and technology. The updated, online maps are easily accessible to community stakeholders for use in reducing the risk for flood damage.

  • New Online Map Tracks Freezing Temperatures

    May 18, 2011 12:45 am

    The Midwestern Regional Climate Center (MRCC) in the Illinois State Water Survey, a division of the Prairie Research Institute at the University of Illinois, has provided a new tool for users to glean information on the occurrences of freezing temperatures to help assess the vulnerability of spring flowers and plants.

  • Ninth Warmest Fall on Record for Illinois

    Dec 11, 2007 7:30 pm

    "Fall temperatures averaged 57.0 degrees, 2.9 degrees above normal and the 9th warmest fall since 1895. This was largely the result of warmer September and October temperatures that were 3.6 and 4.9 degrees above normal, respectively. Statewide temperatures in November averaged 41.6 degrees, only 0.1 degree below normal," 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.

  • View of New York City from the East River.

    NOAA draws on ISWS expertise for climate model update

    Sep 11, 2020 8:00 am

    The National Oceanic and Atmospheric Administration (NOAA) is tapping the expertise of the Illinois State Water Survey (ISWS) to finish a multi-year collaboration updating climate model projections for its Atlas 14, which serves as the benchmark for precipitation frequency values across the United States.

  • No Surprise: July was Hot and Dry in Illinois

    Aug 7, 2012 7:45 pm

    This July was the second warmest and fourth driest on record, according to Illinois State Climatologist Jim Angel of the Illinois State Water Survey at the University of Illinois in Urbana-Champaign.

  • No Surprises for March: Near Average Temperatures

    Apr 5, 2011 12:15 am

    The statewide average temperature for Illinois in March was 41.0 degrees, just 0.1 degrees below the 1971–2000 average, according to State Climatologist Jim Angel of the Illinois State Water Survey (http://www.isws.illinois.edu).

  • November 2013 in Illinois – Cold and Dry

    Dec 2, 2013 1:30 am

    November 2013 will always be remembered for the tornado outbreak on November 17, 2013, that produced 25 tornadoes across Illinois based on the latest reports. While not as dramatic, weather conditions for the month of November were colder and drier than average, according to Illinois State Climatologist Jim Angel at the Illinois State Water Survey, Prairie Research Institute, University of Illinois.

  • November: An Interesting Month for Weather in Illinois

    Dec 7, 2011 9:00 pm

    November in Illinois was the sixth wettest November on record and the ninth warmest, according to Illinois State Climatologist Jim Angel of the Illinois State Water Survey, University of Illinois at Urbana-Champaign.  In addition, the drought in central and western Illinois has ended due to the above average rainfall.

  • map of Illinois average temperature for November 2020

    November brings a warm end to fall

    Dec 2, 2020 9:30 am

    According to Illinois State Climatologist Trent Ford, November was much warmer and slightly drier than average across Illinois. The preliminary statewide average November temperature was 46.6 degrees, 4.1 degrees above the 30-year normal and tied for the ninth warmest on record. Preliminary statewide average total precipitation for November was 2.94 inches, 0.53 inches less than the 30-year normal, and the 70th driest on record.

  • November in Illinois: Cool and dry with a dash of snow

    Dec 1, 2017 2:45 pm

    November in Illinois was slightly cooler and slightly drier than average, says the Illinois State Climatologist.

  • November puts an end to a warmer and drier fall

    Dec 4, 2023 10:15 am

    The average statewide temperature was above the 30-year average in November, according to Illinois State Climatologist Trent Ford at the Illinois State Water Survey. Precipitation was 2.34 inches below average, making it the eighth driest of that month on record. 

  • November Snow Climatology for the Midwest

    Nov 4, 2010 12:45 am

    In the Midwest, November is typically the first month of the cold season when measureable snowfall occurs over a majority of the region, according to the Midwestern Regional Climate Center at the Illinois State Water Survey (ISWS).  However, it is not uncommon for northern portions of the Midwest to experience their first snowfall in October.

  • November was cold and snowy in Illinois

    Dec 4, 2018 2:30 pm

    The statewide average temperature for November in Illinois was 35.3 degrees, which is 7.2 degrees below normal, according to Illinois State Climatologist Jim Angel of the Illinois State Water Survey at the University of Illinois. November 2018 was ranked the eighth coldest November on record.

  • brown fallen leaves

    October broke records for both heat and cold

    Nov 1, 2019 2:15 pm

    State Climatologist Trent Fords reports that Illinois saw highly variable temperatures in October, with record-breaking heat in the early part of the month and record-breaking cold in the latter part.

  • October brought real fall to Illinois this year

    Nov 1, 2022 3:00 pm

    October in 2021 was warm and rainy, putting a damper on fall festivities in Illinois, but this year’s October did not disappoint fall lovers, according to Illinois State Climatologist Trent Ford at the University of Illinois’ Illinois State Water Survey. Temperatures and precipitation were below average.

  • October in Illinois: Cool and Wet

    Nov 1, 2012 7:30 pm

    October 2012 was cooler and wetter than normal, according to Illinois State Climatologist Jim Angel of the Illinois State Water Survey at the University of Illinois in Urbana-Champaign.

  • October in Illinois had warm temperatures and plenty of rain

    Nov 2, 2021 10:45 am

    October 2021 in Illinois was the eighth warmest and the fourth wettest October on record going back to 1895, according to Illinois State Climatologist Trent Ford at the University of Illinois’ Illinois State Water Survey.

  • October Rainfall Helps Soil Dryness

    Nov 4, 2013 1:45 am

    Precipitation was near normal for the month of October in Illinois, at a statewide average of 3.2 inches. The long-term average, or normal, for October is 3.26 inches of precipitation, according to Illinois State Climatologist Jim Angel at the Illinois State Water Survey, Prairie Research Institute, University of Illinois.

  • October Solar Radiation in Illinois: Record High in 2010, Record Low Last Year

    Nov 10, 2010 12:45 am

    Did it seem to you that the weather in October was quite a bit sunnier than in Octobers of the past? Do you remember last October as being rather cloudy?

    If these are your impressions, you are correct, according to Bob Scott, Director of the Water and Atmospheric Resources Monitoring Program at the Illinois State Water Survey. Scott operates an array of weather sites across the state called the Illinois Climate Network, and one of the sensors on the stations measures solar radiation.

  • October: Warm and Dry in Illinois

    Nov 2, 2015 2:30 pm

    October was warmer and drier than average in Illinois. The statewide average temperature was 55.8 degrees, 1.7 degrees above average, according to Illinois State Climatologist Jim Angel, Illinois State Water Survey, University of Illinois.

  • October was the 10th wettest in Illinois

    Nov 2, 2017 2:30 pm

    The statewide average precipitation in Illinois for October was 4.94 inches, 1.70 inches above normal, and the 10th wettest October since 1895, according to Illinois State Climatologist Jim Angel of the Illinois State Water Survey.