Historical Climate Data

Precipitation Summary

Station: 113335 GALVA, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.52 1.54 2.79 3.93 3.94 4.39 3.98 4.32 3.57 2.73 2.91 2.27 37.89

Precipitation Extremes

Period of Record: 1887-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 5.05 1965 0.09 1981 2.60 01-24-1938
Feb 4.98 1997 0.02 1987 3.16 02-21-1997
Mar 5.80 1954 0.18 1958 2.60 03-25-1954
Apr 9.05 1967 0.70 1915 3.10 04-30-2003
May 9.32 1908 0.47 1992 3.02 05-26-1932
Jun 10.86 1898 0.36 1963 4.25 06-22-1974
Jul 12.50 1992 0.26 1955 6.10 07-07-1982
Aug 12.54 1924 0.69 1893 9.15 08-20-1924
Sep 11.38 1961 0.28 1956 3.61 09-01-1989
Oct 13.04 1941 0.08 1945 3.84 10-10-1954
Nov 7.94 1985 0.01 1894 3.06 11-17-1928
Dec 5.17 1971 0.09 1995 2.75 12-10-2003
             
Annual 52.14 1941 18.94 2005 9.15 08-20-1924
Winter 9.30 1974 0.90 1920 3.16 02-21-1997
Spring 20.04 1973 1.95 1934 3.10 04-30-2003
Summer 24.12 1924 3.14 1893 9.15 08-20-1924
Fall 20.93 1941 3.35 1939 3.84 10-10-1954

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 7.0 4.0 0.7 0.2
Feb 6.5 4.0 0.9 0.3
Mar 9.5 6.1 1.7 0.6
Apr 10.8 6.9 2.7 1.0
May 11.4 7.7 2.8 1.0
Jun 9.9 6.9 3.1 1.3
Jul 9.0 6.6 2.5 1.0
Aug 9.2 6.2 2.7 1.6
Sep 8.4 5.9 2.4 1.0
Oct 8.4 5.4 1.8 0.7
Nov 8.5 5.7 2.0 0.6
Dec 8.0 4.6 1.4 0.5
         
Annual 106.7 70.1 24.9 9.9
Winter 21.5 12.6 3.1 1.0
Spring 31.7 20.7 7.3 2.6
Summer 28.1 19.7 8.3 4.0
Fall 25.4 17.0 6.2 2.3

Temperature Summary

Station 113335 GALVA, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 28.9 34.7 47.4 60.7 72.1 81.7 84.9 82.9 76.2 64.0 47.6 34.1 59.6
Low °F 12.5 18.4 28.7 39.1 50.6 59.5 64.0 61.5 53.2 41.5 30.0 18.0 39.8
Mean °F 20.7 26.6 38.1 49.9 61.4 70.6 74.5 72.2 64.7 52.8 38.8 26.1 49.7
HDD 1374 1077 836 457 190 22 4 18 92 388 785 1207 6450
CDD 0 0 0 4 78 189 297 241 84 8 0 0 901

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

Temperature Extremes

Period of Record: 1887-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 35.6 1933 6.4 1977 67 01-24-1909 -23 01-05-1924
Feb 38.2 1954 11.7 1936 70 02-15-1921 -28 02-13-1905
Mar 49.4 1945 24.2 1960 86 03-24-1910 -12 03-01-1962
Apr 58.6 1955 40.7 1907 93 04-10-1930 9 04-05-1920
May 69.0 1934 53.7 1907 105 05-31-1934 22 05-03-2005
Jun 78.8 1934 64.3 1903 105 06-02-1934 34 06-06-1887
Jul 83.8 1936 70.3 1971 111 07-14-1936 44 07-22-1947
Aug 80.0 1947 66.2 2004 105 08-18-1936 38 08-30-1915
Sep 72.2 1933 58.9 1918 101 09-05-1899 4 09-12-1894
Oct 64.0 1963 43.2 1925 94 10-31-1909 9 10-29-1925
Nov 49.5 2001 29.9 1976 83 11-01-1950 -7 11-28-1930
Dec 37.3 1923 12.3 1983 69 12-05-1998 -26 12-28-1924
                 
Annual 54.5 1931 46.5 1901 111 07-14-1936 -28 02-13-1905
Winter 34.1 1932 14.0 1979 70 02-15-1921 -28 02-13-1905
Spring 54.9 1977 45.0 1984 105 05-31-1934 -12 03-01-1962
Summer 78.3 1936 67.8 1915 111 07-14-1936 34 06-06-1987
Fall 59.4 1931 46.2 1976 101 09-05-1999 -7 11-28-1930

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 18.7 29.8 7.5
Feb 0.0 12.4 25.3 4.2
Mar 0.0 3.8 21.5 0.2
Apr 0.1 0.3 7.5 0.0
May 0.4 0.0 0.3 0.0
Jun 3.6 0.0 0.0 0.0
Jul 7.4 0.0 0.0 0.0
Aug 4.9 0.0 0.0 0.0
Sep 1.7 0.0 0.2 0.0
Oct 0.0 0.0 4.9 0.0
Nov 0.0 3.0 18.3 0.2
Dec 0.0 13.5 28.5 4.1
         
Annual 18.3 51.3 136.2 16.0
Winter 0.0 44.5 83.6 15.8
Spring 0.5 4.1 29.6 0.2
Summer 16.0 0.0 0.0 0.0
Fall 1.8 3.0 23.5 0.2

Snowfall Summary

Station: 113335 GALVA, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 8.5 6.1 3.8 1.6 0.0 0.0 0.0 0.0 0.0 0.4 2.2 6.5 29.1

Snowfall Extremes

Period of Record: 1887-2006

Month High (in) Year 1-Day Max (in) Date
Jan 33.5 1979 13.0 01-04-1971
Feb 22.1 1905 9.0 02-26-1913
Mar 21.4 1912 9.0 03-26-1970
Apr 14.5 1912 14.5 04-18-1912
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 1.5 1942 1.5 09-25-1942
Oct 7.0 1997 7.0 10-27-1997
Nov 9.0 1926 7.0 11-27-1975
Dec 25.5 2000 13.0 12-01-2006
Season (Jul-Jun) 69.1 1978-1979 14.5 04-18-1912

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 3.6 2.2 1.3 0.2
Feb 3.6 2.2 1.3 0.2
Mar 1.9 1.4 0.9 0.2
Apr 0.7 0.4 0.2 0.1
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 0.1 0.1 0.0
Nov 1.5 0.9 0.4 0.1
Dec 3.7 2.5 1.4 0.2
Annual 16.0 10.7 5.9 1.2

Growing Season Summary

Station: 113335 GALVA, 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 4 18 98 315 661 921 1068 1004 739 401 108 16 5311
45 0 5 52 200 508 771 913 850 590 268 55 6 4186
50 0 1 25 114 362 621 759 695 444 161 24 2 3183
55 0 0 9 56 233 471 605 540 306 86 9 0 2299
60 0 0 3 25 131 326 451 386 189 36 2 0 1540
50** 2 11 64 186 401 609 729 675 468 237 59 9 3428

**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 4/21 4/05 4/09 5/08 5/16 10/14 9/22 9/28 11/03 11/07
30 4/16 3/29 4/03 4/30 5/07 10/18 9/22 10/05 11/05 11/12
28 4/08 3/27 3/31 4/22 5/07 10/30 10/02 10/12 11/14 11/20
24 4/06 3/15 3/25 4/13 4/22 11/06 10/20 10/23 11/16 11/20
20 3/22 2/22 3/10 4/09 4/09 11/14 10/20 11/02 11/29 12/11
16 3/13 2/10 2/23 3/27 4/07 11/27 11/02 11/10 12/11 12/21

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 176 140 151 194 204
30 186 150 169 208 215
28 201 176 179 219 232
24 212 193 198 232 237
20 234 194 213 257 261
16 255 220 233 277 309

Back to the Station List

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