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

State Climatologist Office for Illinois

Climate Maps for Illinois

Dr. Jim Angel, State Climatologist

The new climate normals for Illinois are available on the new climate normals map page and replace the ones found here. I will keep these maps here for a while before moving them to an archive.

These maps describe the climate of Illinois using the 1971-2000 average or "normals". Available maps include temperature, precipitation, snowfall, heating-, cooling-, and growing-degree days, as well as frequency of days at various thresholds of temperature, precipitation and snowfall. These maps may be reproduced and redistributed, crediting the Illinois State Water Survey (see data disclaimer).

Precipitation (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
Snowfall (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
Growing Degree Days
Jan Feb Mar Apr May Jun  
Jul Aug Sep Oct Nov Dec Annual
Days At Selected Temperature Thresholds
Days at or above 90F Days at or above 100F Days at or below 32F Days at or below 0F
Days At Selected Precipitation Thresholds
Days precipitation at or above 0.01 inches Days precipitation at or above 0.25 inches Days precipitation at or above 1.00 inches
Days At Selected Snowfall Thresholds
Days snowfall at or above 1 inches Days snowfall at or above 6 inches

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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