Current climate conditions in Illinois are represented here using tables, figures, and maps of temperature, precipitation, and snowfall for selected time periods. These are typically updated by 11 am each day. Additional maps for the Midwest are available on the right from the Applied Climate Information System (ACIS). The maps are grouped by parameter.
The snowfall year-to-date starts on September 1. Sometimes the daily updates of these maps fail. In which case the maps for the Midwest from the Applied Climate Information System (ACIS), mentioned above, are a possible substitute.
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).
For other detailed precipitation reports of Illinois (rain, snow, and hail), visit the rapidly expanding Community Collaborative Rain, Hail, and Snow network (CoCoRaHS).