Chicago and Rockford Winter 2011-2012

This past winter was unusually mild across our forecast area. Below are some updated statistics for both Chicago and Rockford through February 29th. Both Chicago and Rockford ranked in the top 10 for the most number of 40 degree days throughout a winter season. Chicago saw their most 40 degree days for a winter season since the 1931-1932 season, while Rockford saw their most 40 degree days in a winter season since the 2001-2002 season. The warmth we experienced led to below average snowfall and the snow we did get didn't stick around very long. Both Chicago and Rockford ranked in the Top 10 for the least number of days with at least 1 inch of snow on the ground this winter.

Rockford: 40 Degree Days
Rank Winter # of 40 Degree Days
1 1932-1933 48
  2001-2002 48
3 1943-1944 43
4 1931-1932 41
  2011-2012 41
6 1927-1928 39
7 1933-1934 38
8 1920-1921 36
  1923-1924 36
10 1930-1931 35

Data for Entire Meteorological Winter (December 1st - February 28th/29th)
The high reached at least 40 degrees on 45% of the days this winter in Rockford.

Chicago: 40 Degree Days 
Rank Winter # of 40 Degree Days
1 1881-1882 61
2 1877-1878 54
3 1879-1880 53
4 1889-1890 52
5 1875-1876 51
6 1931-1932 50
  2011-2012 50
8 2001-2001 49
9 1932-1933 45
  1998-1999 45

 

Data for Entire Meteorological Winter (December 1st - February 28th/29th)
The high reached at least 40 degrees on 55% of the days this winter in Chicago.

Rockford: Least Amount of Days with 1 inch or More of Snow on Ground
Rank Winter # of Days
1 2002-2003 14
2 2001-2002 18
3 1998-1999 21
  2011-2012 21
5 1967-1968 23
6 1955-1956 24
7 1953-1954 26
8 1997-1998 27
9 1991-1992 28
10 1980-1981 29

 

Data from October 1st through February 28th/29th
Rockford had only 23% of the days in December through February with at least 1 inch of snow on the ground.

Chicago: Least Amount of Days with 1 Inch or More of Snow on Ground
Rank Winter # of Days
1 1931-1932 8
  1936-1937 8
  1948-1949 8
4 1905-1906 10
5 1889-1890 12
6 1890-1891 13
  1921-1922 13
  1930-1931 13
  2011-2012 13
10 1943-1944 14
  1952-1953 14
  1982-1983 14
     

Data from October 1st through February 28th/29th
Chicago had only 14% of the days in December through February with at least 1 inch of snow on the ground.

Temperatures and snow cover are related, and seeing as we only had snow on the ground for short periods of time this winter, it allowed our temperatures to remain above normal for long periods of time.

Poulos/Voss 03/08/2012



Return to News Archive

USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.