Historical Climate Data

Precipitation Summary

Station: 113595 GRAND TOWER 2 N, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 2.89 2.89 4.42 4.45 4.81 4.19 3.72 3.71 3.06 3.11 4.60 3.84 45.69

Precipitation Extremes

Period of Record: 1940-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 15.05 1950 0.03 1943 5.02 01-04-1950
Feb 7.79 1945 0.19 1947 4.64 02-26-1945
Mar 13.16 1945 1.07 1954 5.20 03-28-1977
Apr 13.18 1957 1.24 1988 6.48 04-30-1983
May 14.72 1957 0.66 1994 5.48 05-22-1957
Jun 10.61 1969 0.65 1991 6.96 06-23-1969
Jul 10.33 2001 0.17 1974 5.40 07-03-1965
Aug 11.73 1977 0.57 1948 5.45 08-29-1974
Sep 10.67 1945 0.02 1953 5.16 09-13-1949
Oct 11.08 1984 0.00 1964 4.07 10-22-1984
Nov 10.09 1985 0.00 1949 6.35 11-15-1993
Dec 16.23 1982 0.12 1955 5.26 12-03-1982
             
Annual 72.80 1945 29.77 1963 6.96 06-23-1969
Winter 25.36 1950 3.34 1943 5.26 12-03-1982
Spring 31.19 1957 5.33 1941 6.48 04-30-1983
Summer 24.25 1977 2.53 1991 6.96 06-23-1969
Fall 24.88 1984 2.87 1953 6.35 11-15-1993

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 6.9 5.2 1.8 0.6
Feb 6.8 5.0 2.3 0.7
Mar 9.4 6.9 3.2 1.2
Apr 9.1 6.7 2.7 1.3
May 8.9 7.1 3.5 1.4
Jun 8.0 6.4 2.9 1.3
Jul 6.3 5.4 2.6 1.1
Aug 6.2 5.0 2.3 1.1
Sep 5.8 4.6 2.2 0.9
Oct 6.1 4.7 2.2 0.8
Nov 7.7 6.2 3.0 1.3
Dec 7.1 5.8 2.4 1.1
         
Annual 88.3 69.0 31.1 13.1
Winter 20.8 16.0 6.5 2.5
Spring 27.4 20.8 9.3 4.0
Summer 20.5 16.7 7.9 3.6
Fall 19.6 15.5 7.4 3.1

Temperature Summary

There are insufficient temperature data to produce the temperature summary.

Snowfall Summary

Station: 113595 GRAND TOWER 2 N, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 3.2 3.1 1.5 0.3 0.0 0.0 0.0 0.0 0.0 0.1 0.5 1.0 9.7

Snowfall Extremes

Period of Record: 1940-2006

Month High (in) Year 1-Day Max (in) Date
Jan 20.0 1978 9.5 01-10-1954
Feb 16.8 1993 12.0 02-26-1979
Mar 15.0 1960 12.0 03-15-1999
Apr 8.0 1971 5.0 04-06-1971
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 2.0 1993 2.0 10-30-1993
Nov 10.0 1951 10.0 11-06-1951
Dec 11.3 1969 5.1 12-31-1969
Season (Jul-Jun) 36.8 1978-1979 12.0 03-15-1999

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 1.6 1.1 0.5 0.1
Feb 1.6 1.1 0.5 0.1
Mar 0.5 0.4 0.3 0.1
Apr 0.1 0.1 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 0.2 0.2 0.1 0.0
Dec 0.7 0.4 0.2 0.0
Annual 4.9 3.4 1.9 0.5

Growing Season Summary

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

Back to the Station List

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