Illinois State Water Survey - University of Illinois at Urbana-Champaign

State Climatologist Office for Illinois

Climate Normals Maps for Illinois (1981-2010)

Dr. Jim Angel, State Climatologist

These maps describe the climate of Illinois using the official 1981-2010 normals from the National Climatic Data Center. Available maps include precipitation, temperature, snowfall, heating degree days, and cooling degree days, as well as number of days above or below selected thresholds of precipitation, temperature, and snowfall. Data for individual sites may be found on my Illinois Climate Normals page.

These maps may be reproduced and redistributed, crediting the Illinois State Water Survey (see data disclaimer). Our GIS specialist, Zoe Zaloudek, generated the maps using ArcGIS and Python scripts.

Precipitation (inches)
Jan Feb Mar Apr May Jun  
Jul Aug Sep Oct Nov Dec Annual
Days with Precipitation Greater Than or Equal to 0.01 inches
Jan Feb Mar Apr May Jun  
Jul Aug Sep Oct Nov Dec Annual
Days with Precipitation Greater Than or Equal to 0.10 inches
Jan Feb Mar Apr May Jun  
Jul Aug Sep Oct Nov Dec Annual
Days with Precipitation Greater Than or Equal to 1.00 inches
Jan Feb Mar Apr May Jun  
Jul Aug Sep Oct Nov Dec Annual
Mean Daily High Temperature (degrees F)
Jan Feb Mar Apr May Jun  
Jul Aug Sep Oct Nov Dec Annual
Mean Daily Low Temperature (degrees F)
Jan Feb Mar Apr May Jun  
Jul Aug Sep Oct Nov Dec Annual
Mean Daily Temperature (degrees F)
Jan Feb Mar Apr May Jun  
Jul Aug Sep Oct Nov Dec Annual
Days Above 90 degrees F
Jan Feb Mar Apr May Jun  
Jul Aug Sep Oct Nov Dec Annual
Days Above 100 degrees F
Jan Feb Mar Apr May Jun  
Jul Aug Sep Oct Nov Dec Annual
Snowfall (inches)
Jan Feb Mar Apr May Jun  
Jul Aug Sep Oct Nov Dec Annual
Days with Snowfall Greater than 0.1 inches
Jan Feb Mar Apr May Jun  
Jul Aug Sep Oct Nov Dec Annual
Days with Snowfall Greater than 1.0 inches
Jan Feb Mar Apr May Jun  
Jul Aug Sep Oct Nov Dec Annual
Days with Snowfall Greater than 10.0 inches
Jan Feb Mar Apr May Jun  
Jul Aug Sep Oct Nov Dec Annual
Heating Degree Days
Jan Feb Mar Apr May Jun  
Jul Aug Sep Oct Nov Dec Annual
Cooling Degree Days
Jan Feb Mar Apr May Jun  
Jul Aug Sep Oct Nov Dec Annual

See the frost and growing season page for information on those two topics.

See the wind speed and wind rose pages for information on those topics.

The data used in these products come from the National Weather Service (NWS) Cooperative Observer Program (COOP). This network of more than 11,000 volunteer observers nationwide, using approved instruments and observing techniques, provides high-quality climate data to the nation. The data are archived at the National Climatic Data Center (NCDC).

Illinois State Water Survey

2204 Griffith Dr
Champaign, IL 61820-7463
217-333-0729
jimangel@illinois.edu

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