Historical Climate Data

Precipitation Summary

Station: 111627 CHILLICOTHE, IL


1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.58 1.65 2.80 3.34 4.24 3.99 3.67 3.60 3.36 2.66 3.10 2.37 36.36

Precipitation Extremes

Period of Record: 1940-2006


Month

High (in)

Year

Low (in)

Year
1-Day
Max (in)

Date
Jan 6.54 1965 0.12 1981 4.50 01-27-1996
Feb 6.46 1997 0.00 1987 3.86 02-21-1997
Mar 6.90 1985 0.24 2005 3.16 03-15-1944
Apr 7.67 1981 0.65 1986 2.56 04-20-1955
May 10.81 1995 0.60 1992 2.66 05-12-2002
Jun 10.91 1990 0.40 1965 4.06 06-20-1964
Jul 9.09 1992 0.26 1988 4.49 07-09-1951
Aug 10.00 1987 0.49 1974 4.80 08-17-1997
Sep 11.24 1961 0.00 1979 3.13 09-14-1961
Oct 9.75 1941 0.01 1964 4.02 10-03-1986
Nov 10.22 1985 0.25 1999 3.11 11-19-1985
Dec 5.77 1982 0.24 1958 2.77 12-03-1982
             
Annual 54.56 1970 21.83 2005 4.80 08-17-1997
Winter 11.98 1950 1.47 1963 4.50 01-27-1996
Spring 17.97 1995 3.70 1992 3.16 03-15-1944
Summer 23.08 1981 3.20 1988 4.80 08-17-1997
Fall 16.98 1961 3.14 2002 4.02 10-03-1986


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 6.5 4.6 0.8 0.2
Feb 5.6 3.9 1.0 0.2
Mar 8.1 5.9 1.8 0.6
Apr 8.9 6.5 2.1 0.9
May 10.2 7.8 3.0 1.0
Jun 8.9 6.4 2.8 1.0
Jul 7.7 6.0 2.5 1.1
Aug 8.1 6.2 2.4 1.0
Sep 6.8 5.0 2.2 0.9
Oct 7.0 5.1 1.7 0.6
Nov 7.6 5.8 2.3 0.8
Dec 7.2 5.1 1.3 0.6
         
Annual 92.5 68.3 24.0 8.8
Winter 19.2 13.6 3.1 1.0
Spring 27.2 20.2 6.9 2.5
Summer 24.8 18.5 7.8 3.1
Fall 21.4 16.0 6.2 2.3

Temperature Summary

There are insufficient temperature data to produce the temperature summary.


Snowfall Summary

Station: 111627 CHILLICOTHE, IL


1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 7.1 4.3 2.1 0.9 0.0 0.0 0.0 0.0 0.0 0.0 0.9 5.7 21.0

Snowfall Extremes

Period of Record: 1940-2006

Month High (in) Year 1-Day Max (in) Date
Jan 27.0 1979 11.0 01-27-1967
Feb 14.0 1950 5.3 02-14-1952
Mar 12.1 1965 7.5 03-09-1999
Apr 11.5 1997 11.5 04-11-1997
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 2.0 1967 2.0 10-27-1967
Nov 6.2 1951 5.0 11-27-1975
Dec 18.1 2000 9.0 12-19-1973
Season (Jul-Jun) 40.2 1951-1952 11.5 04-11-1997

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 2.6 2.1 1.0 0.1
Feb 2.6 2.1 1.0 0.1
Mar 0.9 0.8 0.4 0.1
Apr 0.2 0.2 0.2 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 0.7 0.5 0.2 0.0
Dec 2.9 2.4 1.4 0.1
Annual 11.2 9.1 4.6 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