These observations are taken by the Illinois State Water Survey, located near the corner of Windsor Road and First Street in Champaign using a variety of weather instruments. Real-time conditions at this site are reported here.
For an extended view of precipitation in the Champaign-Urbana area check out the Boneyard Network.
The "current month" link has this month and previous months back to January 2011. A more detailed report in pdf format is prepared usually a few days after the end of the month. Because the data changes every day, refreshing/reloading the pages in your browser is advisable.
Starting in March 2011, we changed the way the monthly reports were generated. The original program was written for Microsoft Access 97 and is no longer supportable. Therefore, I have been adding features to the Microsoft Excel spreadsheet used in the "Current Month" product. The "Daily Summaries by Month" PDF are generated directly from that spreadsheet.