Month by Month – 2013 in Illinois

Here are the monthly plots of temperature and precipitation departures for the state of Illinois for 2013, updated through the end of July. Departures are based on the 1981-2010 average. [Revised August 13 with release of data from the national archive].

Cooler than average conditions prevailed in March, April, and July. Warmer than average conditions occurred in January and to a lesser extent in May. February and June were near-average.

Wetter than average conditions prevailed in January, February, April, May, and June. March was near-average while July was below average. In terms of departures, we have seen a steady decline from April to July from over three inches above average to over one inch below average.