Historical Climate Data

Precipitation Summary

Station: 119354 WINDSOR, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.99 1.89 3.30 3.70 3.99 4.05 4.00 3.27 3.05 3.07 3.85 2.98 39.14

Precipitation Extremes

Period of Record: 1904-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 11.06 1950 0.00 1944 3.10 01-03-1950
Feb 6.12 2004 0.25 1947 2.47 02-07-1999
Mar 9.73 1938 0.43 1910 4.09 03-14-1922
Apr 9.35 1994 0.44 1971 3.31 04-17-1940
May 13.26 1908 0.35 1914 4.10 05-04-1908
Jun 15.52 1957 0.61 1988 5.52 06-27-1957
Jul 10.01 1958 0.43 1947 4.62 07-10-1971
Aug 10.00 1939 0.07 1971 3.63 08-20-1915
Sep 14.76 1911 0.10 2004 4.34 09-01-2003
Oct 10.39 1941 0.11 1908 4.75 10-27-1919
Nov 10.88 1992 0.02 1917 4.30 11-27-1910
Dec 7.76 1982 0.13 1976 4.50 12-07-1966
             
Annual 57.63 1950 24.20 1954 5.52 06-27-1957
Winter 20.32 1950 1.42 1964 4.50 12-07-1966
Spring 22.07 2002 4.51 1988 4.10 05-04-1908
Summer 23.66 1957 3.24 1984 5.52 06-27-1957
Fall 21.34 1911 3.16 1953 4.75 10-27-1919

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 8.2 4.6 1.3 0.2
Feb 6.5 3.9 1.2 0.4
Mar 10.5 7.2 2.2 0.5
Apr 11.2 7.8 2.6 0.9
May 10.9 7.0 2.7 0.9
Jun 9.7 6.9 2.7 0.9
Jul 9.2 6.3 2.6 1.1
Aug 8.2 5.4 2.2 1.1
Sep 7.5 5.0 2.0 0.8
Oct 8.7 5.3 2.4 0.6
Nov 10.0 6.3 2.4 1.1
Dec 9.1 5.8 2.0 0.6
         
Annual 109.8 71.6 26.4 9.0
Winter 23.8 14.4 4.6 1.2
Spring 32.7 22.0 7.5 2.3
Summer 27.1 18.5 7.5 3.0
Fall 26.2 16.6 6.9 2.5

Temperature Summary

Station 119354 WINDSOR, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 34.5 40.5 52.2 64.6 74.9 83.4 86.9 85.4 79.7 68.1 52.4 39.5 63.5
Low °F 18.9 23.7 33.1 42.8 53.2 61.9 65.6 63.5 56.1 45.2 34.8 24.3 43.6
Mean °F 26.7 32.1 42.7 53.7 64.1 72.7 76.3 74.5 67.9 56.7 43.6 31.9 53.6
HDD 1188 921 693 346 138 9 0 7 48 281 642 1027 5300
CDD 0 0 0 7 109 239 349 298 133 22 0 0 1157

HDD - heating degree days (base 65F); CDD - cooling degree days (base 65F)

Temperature Extremes

Period of Record: 1904-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 39.8 2006 12.1 1977 74 01-23-1909 -26 01-24-1915
Feb 47.9 2004 18.5 1978 76 02-28-2004 -24 02-18-1910
Mar 53.9 1946 25.4 1960 89 03-23-1910 -7 03-05-1960
Apr 61.3 2001 44.3 1907 90 04-11-1930 19 04-05-1920
May 71.0 1962 56.1 1924 97 05-30-1913 27 05-25-1925
Jun 79.3 1934 66.4 1928 105 06-26-1954 35 06-16-1917
Jul 83.9 1936 71.2 1924 111 07-14-1936 43 07-02-1904
Aug 81.8 1947 68.1 1915 107 08-05-1918 37 08-31-1915
Sep 74.0 1925 59.3 1918 106 09-05-1954 26 09-28-1942
Oct 63.5 1947 47.0 1917 95 10-03-1922 16 10-29-1925
Nov 52.0 1965 35.4 1951 84 11-28-1965 -6 11-25-1950
Dec 41.6 1923 19.0 1983 72 12-15-1948 -20 12-22-1989
                 
Annual 59.5 1964 50.3 1917 111 07-14-1936 -26 01-24-1915
Winter 39.4 1932 21.6 1978 76 02-28-1904 -26 01-24-1915
Spring 59.3 1977 47.5 1960 97 05-30-1913 -7 03-05-1960
Summer 79.4 1936 70.0 1927 111 07-14-1936 35 06-16-1917
Fall 61.4 1931 50.8 1976 106 09-05-1954 -6 11-25-1950

Temperature Threshold Climatology

Derived from 1971-2000 Averages:

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


Month 		# Days
High ≥ 90°F 		# Days
High ≤ 32°F 		# Days
Low ≤ 32°F 		# Days
Low ≤ 0°F
Jan 0.0 13.2 27.1 3.2
Feb 0.0 7.5 21.0 1.8
Mar 0.0 1.5 15.8 0.1
Apr 0.0 0.0 4.2 0.0
May 0.9 0.0 0.2 0.0
Jun 6.2 0.0 0.0 0.0
Jul 10.6 0.0 0.0 0.0
Aug 7.4 0.0 0.0 0.0
Sep 3.0 0.0 0.1 0.0
Oct 0.0 0.0 2.6 0.0
Nov 0.0 0.9 13.3 0.0
Dec 0.0 7.4 23.8 1.3
         
Annual 27.8 30.7 108.7 6.4
Winter 0.0 28.1 71.9 6.2
Spring 0.9 1.5 20.2 0.1
Summer 24.2 0.0 0.0 0.0
Fall 2.9 0.9 16.2 0.0

Snowfall Summary

Station: 119354 WINDSOR, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 7.7 4.0 2.8 0.2 0.0 0.0 0.0 0.0 0.0 0.0 1.3 5.3 21.4

Snowfall Extremes

Period of Record: 1904-2006

Month High (in) Year 1-Day Max (in) Date
Jan 27.5 1979 14.0 01-13-1927
Feb 18.0 1934 7.0 02-25-1993
Mar 21.6 1906 13.0 03-25-1930
Apr 4.5 1920 4.0 04-11-1940
May 0.2 1909 0.2 05-01-1909
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 2.0 1913 2.0 10-29-1913
Nov 12.0 1932 10.0 11-16-1932
Dec 26.5 1973 12.0 12-19-1973
Season (Jul-Jun) 46.0 1983-1984 14.0 01-13-1927

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 2.1 1.4 0.8 0.2
Feb 2.1 1.4 0.8 0.2
Mar 1.4 1.0 0.7 0.1
Apr 0.3 0.2 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 0.1 0.0 0.0 0.0
Nov 0.7 0.5 0.3 0.0
Dec 2.9 1.9 1.1 0.2
Annual 11.5 7.7 4.4 0.8

Growing Season Summary

Station: 119354 WINDSOR, IL

Growing Degree Day Averages

Derived from 1971-2000 Data

Base Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
40 20 53 185 432 760 986 1135 1071 848 522 189 44 6187
45 7 22 106 299 605 837 980 917 698 377 111 19 4934
50 2 7 57 187 453 688 825 763 549 247 57 8 3807
55 0 1 27 104 310 540 670 608 403 144 24 2 2807
60 0 0 9 47 185 392 516 454 268 70 7 0 1931
50** 11 30 110 259 480 668 783 733 556 317 102 22 4035

**Modified Growing Degree Days: Base 50, Ceiling 86.

Growing Season Summary

Derived from 1971-2000 Averages

Date of Last Spring Occurrence Date of First Fall Occurrence
Temp °F Median Early 90% 10% Late Median Early 90% 10% Late
32 4/15 3/29 4/04 5/08 5/12 10/17 9/22 10/04 11/04 11/20
30 4/10 3/23 3/30 4/22 5/02 10/24 10/02 10/08 11/11 11/20
28 4/07 3/15 3/23 4/13 4/19 10/31 10/07 10/16 11/14 11/23
24 3/25 3/02 3/13 4/10 4/18 11/14 10/23 11/02 12/03 12/22
20 3/15 2/22 2/28 4/04 4/09 11/21 10/24 11/07 12/09 12/22
16 3/06 1/29 2/08 3/18 3/25 12/07 11/02 11/11 12/22 12/25

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 183 140 165 211 225
30 198 175 180 217 226
28 209 182 189 231 235
24 228 207 213 255 282
20 252 220 230 277 287
16 281 236 250 304 312

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