A Cold and Snowy Winter in Illinois

For anyone who lives in Illinois, it will come as no surprise that we were colder and snowier than normal this winter. The statewide average temperature for December-February was 24.9 degrees. That is 3.3 degrees below normal and the 17th coldest December-February since statewide record began in 1895. The coldest December-February in Illinois was 1977-78 with 19.6 degrees.

Snowfall for December-February ranged from 15 inches in southern Illinois to over 45 inches in northern Illinois (see maps below). According to the Lincoln NWS office, Peoria reported its snowiest December-February on record with 52.5 inches while Springfield reported its fifth snowiest December-February with 34.2 inches. According to the Chicago NWS office, Rockford reported its third snowiest December-February with 51.2 inches and Chicago reported its fifth snowiest December-February with 56.3 inches.

Precipitation (both rainfall and the water content of any snow) was near-normal. The statewide average precipitation was 6.90 inches, only 0.14 inches below normal.

Climatologists define winter as the months of December, January, and February because it lines up better with the kinds of weather we expect to see in winter. It’s better than the December 22 to March 22 definition, which is based on the winter solstice and the vernal equinox. In many cases in Illinois, we have already had several doses of winter weather by December 22 and winter weather is fading away once March arrives.

 

December 2010 to February 2011 snowfall.
December 2010 to February 2011 snowfall departure from normal.
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