Historical Climate Data

Precipitation Summary

Station: 111491 CHESTER, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 2.55 2.55 3.98 3.85 4.68 4.43 4.16 3.45 3.61 3.08 4.41 3.47 44.22

Precipitation Extremes

Period of Record: 1896-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 12.13 1916 0.00 1943 3.80 01-01-1948
Feb 6.77 1908 0.05 1947 2.30 02-07-1999
Mar 9.17 1904 0.04 1910 4.26 03-26-1904
Apr 10.40 1927 1.07 1915 3.20 04-26-1912
May 12.46 1995 0.56 1932 4.42 05-01-1946
Jun 12.71 1928 0.23 1933 4.97 06-11-1938
Jul 13.56 1905 0.25 1918 3.44 07-21-1905
Aug 13.44 1915 0.09 1909 6.53 08-11-1933
Sep 11.88 1986 0.03 1928 8.06 09-17-1905
Oct 8.44 1919 0.10 1908 3.40 10-26-1991
Nov 10.88 1985 0.28 1910 4.50 11-14-1993
Dec 12.22 1982 0.00 1953 4.57 12-08-1916
             
Annual 60.25 1990 22.20 1936 8.06 09-17-1905
Winter 18.26 1916 2.50 1936 4.57 12-08-1916
Spring 21.95 1908 4.18 1941 4.42 05-01-1946
Summer 27.35 1915 3.07 1930 6.53 08-11-1933
Fall 22.18 1984 3.30 1953 8.06 09-17-1905

Precipitation Threshold Climatology

Derived from 1971-2000 Averages:

*Annual/seasonal totals may differ from the sum of the monthly totals due to rounding.


Month 		# Days
Total ≥ 0.01" 		# Days
Total ≥ 0.10" 		# Days
Total ≥ 0.50" 		# Days
Total ≥ 1.00"
Jan 7.3 5.2 1.6 0.6
Feb 7.1 4.9 1.7 0.6
Mar 9.8 7.4 3.0 1.0
Apr 9.9 7.5 2.7 0.9
May 10.2 7.4 3.1 1.3
Jun 8.3 6.5 3.1 1.4
Jul 7.1 5.9 3.1 1.2
Aug 6.8 5.2 2.2 1.3
Sep 6.3 5.2 2.2 1.1
Oct 6.9 5.1 2.1 0.8
Nov 8.5 6.6 3.2 1.4
Dec 7.9 6.3 2.3 0.9
         
Annual 96.2 73.3 30.3 12.3
Winter 22.3 16.4 5.6 2.1
Spring 29.9 22.3 8.7 3.2
Summer 22.3 17.6 8.4 3.8
Fall 21.7 16.9 7.5 3.2

Temperature Summary

There are insufficient temperature data to produce the temperature summary.

Snowfall Summary

Station: 111491 CHESTER, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 5.5 3.5 2.0 0.4 0.0 0.0 0.0 0.0 0.0 0.1 1.1 3.0 15.6

Snowfall Extremes

Period of Record: 1896-2006

Month High (in) Year 1-Day Max (in) Date
Jan 21.5 1979 7.0 01-31-1982
Feb 21.0 1993 10.0 02-25-1993
Mar 22.5 1960 13.0 03-14-1999
Apr 8.0 1971 6.0 04-06-1971
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 1.5 1993 1.5 10-30-1993
Nov 10.5 1980 9.0 11-27-1980
Dec 24.0 2002 8.0 12-28-1988
Season (Jul-Jun) 48.0 2002-2003 13.0 03-14-1999

Snowfall Threshold Climatology

Derived from 1971-2000 Averages

*Annual values may differ from the sum of the monthly values due to rounding.


Month 		# Days
Total ≥ 0.1" 		# Days
Total ≥ 1.0" 		# Days
Total ≥ 2.0" 		# Days
Total ≥ 5.0"
Jan 2.0 1.4 0.6 0.2
Feb 2.0 1.4 0.6 0.2
Mar 0.7 0.6 0.3 0.1
Apr 0.2 0.2 0.1 0.0
May 0.0 0.0 0.0 0.0
Jun 0.0 0.0 0.0 0.0
Jul 0.0 0.0 0.0 0.0
Aug 0.0 0.0 0.0 0.0
Sep 0.0 0.0 0.0 0.0
Oct 0.0 0.0 0.0 0.0
Nov 0.3 0.3 0.2 0.1
Dec 1.4 1.2 0.6 0.2
Annual 7.4 5.9 3.2 0.7

Growing Season Summary

There are insufficient temperature data to produce the growing season summary.

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Copyright 2007 Illinois State Water Survey
Jim Angel, State Climatologist, jimangel@illinois.edu
Last Modified: September 11, 2007