Welcome to the State Climatologist Office for Illinois. This website contains a wide range of climate data, maps, and information on Illinois. Our office has access to more data stored offline. In addition, we do research in Illinois on past climate events, monitor current conditions, and study possible future climate change. See the About Us link for more information. On the right are tweets and links to blog posts.
Here is a quick glance of current conditions in Illinois from left to right, 1) 30-day, 2) 90-day precipitation departures, 3) 30-day, 4) 90-day temperature departures, and 5) winter snowfall departure from average. Click to enlarge. Here is the link to more maps of current conditions.
Illinois experienced one of the most severe droughts in recent decades in 2012. The 2012 drought was covered extensively in the blog at http://climateillinois.wordpress.com . You can find out information specifically on the 2012 drought on the State Water Survey drought page and the State of Illinois Drought Response Task Force page. You can find out general information on drought in Illinois on my drought page.
In coming months a number of reports at the state and national level will be coming out.
Check out the historical records for Fort Armstrong (1820-1836) on the modern-day Rock Island Arsenal. Fort Armstrong
You can find monthly data for temperature, precipitation, and other parameters by climate division for Illinois here.