Fall is creeping into the Central United States! The image below, updated daily, tracks the locations that have received their first freeze (32 degrees or colder) of the season.
Also, the map of the median first freeze date (32 degrees), based on the 1981-2010 period, is below. The "median" is the date when half of the years had their first freeze earlier and half of the years had their first freeze later. It is close to the "average" first freeze date, but not necessarily the same.
All images are courtesy of the Midwest Regional Climate Center. To see these images and others, visit the Midwest Regional Climate Center's Climate Watch page at http://mrcc.isws.illinois.edu/cliwatch/watch.htm and for more frost/freeze information, visit their Frost/Freeze Vegetation Impact Program page at http://mrcc.isws.illinois.edu/VIP/indexFFG.html!