Historical Climate Data

Precipitation Summary

Station: 115493 MCHENRY WG STRATTON L&D, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.48 1.22 2.12 3.43 3.67 4.09 3.69 4.00 3.22 2.36 2.61 1.82 33.71

Precipitation Extremes

Period of Record: 1948-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 4.34 1979 0.03 1981 1.82 01-15-1979
Feb 3.67 1997 0.02 1987 2.06 02-21-1997
Mar 6.29 1976 0.00 2001 2.87 03-05-1976
Apr 6.31 1999 1.28 1985 2.01 04-16-1998
May 10.25 2004 0.91 1950 2.84 05-18-2004
Jun 10.34 1993 0.73 1988 4.01 06-14-1999
Jul 8.43 1985 0.56 2002 4.77 07-15-1985
Aug 10.80 1987 0.53 1948 4.58 08-14-1987
Sep 10.70 1986 0.00 2002 3.51 09-25-1986
Oct 7.35 2001 0.00 1950 2.68 10-18-1998
Nov 6.32 1985 0.40 1999 1.81 11-11-1995
Dec 4.82 1987 0.32 1976 1.70 12-10-2003
             
Annual 40.01 1998 24.32 2005 4.77 07-15-1985
Winter 9.11 1950 1.11 1977 2.06 02-21-1997
Spring 14.28 1976 3.77 1994 2.87 03-05-1976
Summer 17.67 1981 6.07 1984 4.77 07-15-1985
Fall 14.48 2001 2.92 2002 3.51 09-25-1986

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 8.6 4.2 0.6 0.2
Feb 6.9 3.5 0.6 0.1
Mar 9.1 4.7 1.2 0.2
Apr 11.1 7.3 2.2 0.7
May 11.2 6.8 2.8 0.6
Jun 10.0 7.0 3.1 1.1
Jul 9.2 6.1 2.7 1.2
Aug 10.3 6.8 2.7 1.1
Sep 9.0 5.4 2.0 0.9
Oct 8.3 5.0 1.4 0.6
Nov 9.3 5.6 1.6 0.5
Dec 8.9 4.2 1.0 0.1
         
Annual 111.1 65.7 21.4 7.2
Winter 24.4 11.9 2.2 0.4
Spring 31.2 18.7 6.1 1.5
Summer 29.6 19.9 8.7 3.5
Fall 26.5 15.9 4.9 1.9

Temperature Summary

There are insufficient temperature data to produce the temperature summary.

Snowfall Summary

Station: 115493 MCHENRY WG STRATTON L&D, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 12.6 7.4 3.9 0.4 0.0 0.0 0.0 0.0 0.0 0.0 2.2 8.5 35.0

Snowfall Extremes

Period of Record: 1948-2006

Month High (in) Year 1-Day Max (in) Date
Jan 52.8 1979 19.5 01-15-1979
Feb 30.4 1994 11.0 02-15-1990
Mar 12.0 1982 5.2 03-05-2003
Apr 3.6 1997 3.0 04-12-1997
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 0.0 - - -
Nov 6.0 1996 4.6 11-21-1996
Dec 32.1 2000 8.7 12-07-1994
Season (Jul-Jun) 85.2 1978-1979 19.5 01-15-1979

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 4.6 2.6 1.3 0.2
Feb 4.6 2.6 1.3 0.2
Mar 3.0 1.5 0.8 0.0
Apr 0.3 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 1.9 0.9 0.5 0.0
Dec 5.9 2.8 1.7 0.3
Annual 24.2 12.2 6.9 1.0

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