Historical Climate Data

Precipitation Summary

Station: 111743 CLINTON 1 SSW, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.84 1.93 3.45 4.03 4.28 4.06 4.34 3.88 2.81 3.11 3.28 2.85 39.86

Precipitation Extremes

Period of Record: 1910-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 7.39 1949 0.01 1986 2.75 01-10-1975
Feb 5.76 1990 0.19 1947 2.80 02-10-1959
Mar 8.63 1973 0.29 1910 4.50 03-18-1933
Apr 10.20 1964 0.70 1971 5.28 04-12-1994
May 16.96 1961 0.26 1925 14.25 05-08-1961
Jun 9.22 1935 0.05 1933 6.25 06-24-1919
Jul 13.91 1992 0.46 1988 5.60 07-11-1958
Aug 9.72 1975 0.36 1947 4.25 08-29-1951
Sep 15.27 1926 0.15 1979 3.54 09-19-1986
Oct 11.74 1941 0.12 1964 3.94 10-01-1977
Nov 8.13 1935 0.07 1917 3.80 11-18-2003
Dec 8.15 1967 0.19 1919 3.69 12-02-1982
             
Annual 56.36 1926 20.90 1962 14.25 05-08-1961
Winter 15.21 1950 1.29 1920 3.69 12-02-1982
Spring 24.19 1961 4.08 1932 14.25 05-08-1961
Summer 24.84 1958 2.06 1933 6.25 06-24-1919
Fall 29.14 1926 3.69 1979 3.94 10-01-1977

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 8.7 4.9 0.8 0.2
Feb 8.6 4.6 1.1 0.4
Mar 11.0 6.8 2.4 0.7
Apr 12.1 8.3 2.5 0.8
May 11.1 7.7 3.0 1.2
Jun 10.0 7.3 3.0 1.0
Jul 9.4 6.7 3.2 1.2
Aug 8.6 5.9 2.7 1.1
Sep 8.0 5.1 1.9 0.7
Oct 9.3 5.6 2.2 0.8
Nov 10.2 6.8 2.2 0.8
Dec 9.9 5.8 1.7 0.6
         
Annual 117.1 75.5 26.8 9.3
Winter 27.2 15.3 3.7 1.2
Spring 34.3 22.7 7.9 2.6
Summer 28.1 19.9 8.9 3.3
Fall 27.5 17.5 6.4 2.2

Temperature Summary

There are insufficient temperature data to produce the temperature summary.

Snowfall Summary

Station: 111743 CLINTON 1 SSW, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 2.4 2.5 0.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.0 2.0 8.6

Snowfall Extremes

Period of Record: 1910-2006

Month High (in) Year 1-Day Max (in) Date
Jan 12.0 1962 6.0 01-30-1956
Feb 14.0 1956 6.8 02-24-1965
Mar 23.0 1934 10.0 03-10-1959
Apr 6.0 1957 5.0 04-08-1957
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 0.0 - - -
Nov 9.0 1975 7.0 11-27-1975
Dec 20.4 1973 7.5 12-19-1973
Season (Jul-Jun) 39.5 1959-1960 10.0 03-10-1959

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 1.5 1.0 0.6 0.1
Feb 1.5 1.0 0.6 0.1
Mar 0.8 0.3 0.1 0.0
Apr 0.1 0.0 0.0 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 0.4 0.3 0.2 0.1
Dec 1.3 0.7 0.3 0.1
Annual 4.1 2.4 1.3 0.2

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