Historical Climate Data

Precipitation Summary

Station: 113320 GALESBURG, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.41 1.55 2.84 3.81 3.97 4.18 4.37 4.07 3.50 2.52 2.72 2.28 37.22

Precipitation Extremes

Period of Record: 1895-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 6.32 1897 0.07 1981 2.50 01-02-1897
Feb 4.78 1997 0.01 1987 2.76 02-21-1997
Mar 7.48 1985 0.15 1956 4.11 03-25-1954
Apr 7.67 1950 0.29 1907 3.05 04-29-1967
May 10.07 1995 0.42 1992 2.75 05-11-2002
Jun 9.97 1974 0.42 1900 4.11 06-14-1970
Jul 12.70 1982 0.56 1936 6.13 07-24-1993
Aug 10.69 1977 0.47 1945 5.40 08-16-1898
Sep 11.57 1970 0.32 2002 7.70 09-08-1927
Oct 16.56 1941 0.04 1964 4.17 10-03-1941
Nov 7.21 1985 0.17 1999 2.61 11-19-1954
Dec 5.37 1982 0.27 1955 3.28 12-10-2003
             
Annual 53.59 1941 18.82 1901 7.70 09-08-1927
Winter 9.34 1950 1.29 1961 3.28 12-10-2003
Spring 17.73 1898 4.13 1958 4.11 03-25-1954
Summer 27.48 1993 3.96 1936 6.13 07-24-1993
Fall 25.43 1941 3.14 2002 7.70 09-08-1927

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 8.1 3.8 0.6 0.2
Feb 7.0 3.7 0.9 0.2
Mar 9.9 6.3 1.6 0.6
Apr 11.3 6.6 2.6 1.0
May 11.1 7.7 2.9 0.9
Jun 9.6 6.8 3.2 1.2
Jul 9.1 6.6 2.6 1.3
Aug 9.1 6.6 2.7 1.1
Sep 7.9 5.8 2.6 0.9
Oct 8.3 5.0 1.6 0.5
Nov 9.0 5.7 1.8 0.7
Dec 9.0 4.8 1.4 0.6
         
Annual 109.4 69.5 24.5 9.0
Winter 24.1 12.3 2.9 1.0
Spring 32.3 20.6 7.1 2.4
Summer 27.8 20.0 8.5 3.5
Fall 25.3 16.6 6.0 2.1

Temperature Summary

Station 113320 GALESBURG, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 29.0 35.1 47.9 61.2 72.5 81.4 84.5 81.9 74.7 62.7 46.7 33.4 59.3
Low °F 13.5 19.2 29.4 40.2 51.4 60.8 65.3 63.2 54.7 42.9 30.8 19.2 40.9
Mean °F 21.3 27.2 38.7 50.7 62.0 71.1 74.9 72.6 64.7 52.8 38.8 26.3 50.1
HDD 1356 1059 817 434 176 17 5 17 92 386 788 1200 6347
CDD 0 0 0 5 81 200 312 252 83 8 0 0 941

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

Temperature Extremes

Period of Record: 1896-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 36.9 2006 7.3 1977 68 01-23-1909 -25 01-10-1982
Feb 38.1 1998 14.4 1979 71 02-15-1954 -28 02-13-1905
Mar 45.7 1973 23.0 1960 86 03-29-1986 -14 03-05-1960
Apr 57.7 1955 43.9 1904 91 04-29-1952 9 04-02-1899
May 68.8 1977 56.3 1997 95 05-12-1956 24 05-01-1903
Jun 77.0 2005 64.1 1903 101 06-25-1988 36 06-12-1903
Jul 81.0 1955 70.2 1904 108 07-24-1901 42 07-01-1899
Aug 79.5 1983 67.3 1992 101 08-17-1983 41 08-24-1908
Sep 72.1 2005 60.0 1902 100 09-05-1899 19 09-30-1899
Oct 64.6 1963 46.3 1976 94 10-03-2006 18 10-13-1909
Nov 49.9 2001 31.0 1959 79 11-01-1950 -6 11-27-1898
Dec 35.6 1965 13.5 1983 69 12-03-1970 -22 12-21-1963
                 
Annual 54.2 2006 46.6 1903 108 07-24-1901 -28 02-13-1905
Winter 32.0 2002 15.8 1979 71 02-15-1954 -28 02-13-1905
Spring 56.1 1977 43.9 1900 95 05-12-1956 -14 03-05-1960
Summer 77.4 1983 68.0 1904 108 07-24-1901 36 06-12-1903
Fall 58.0 1963 46.6 1976 100 09-05-1999 -6 11-27-1998

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 17.4 29.3 6.4
Feb 0.0 11.4 24.5 3.4
Mar 0.0 3.5 19.4 0.1
Apr 0.0 0.1 5.7 0.0
May 0.4 0.0 0.2 0.0
Jun 3.6 0.0 0.0 0.0
Jul 7.5 0.0 0.0 0.0
Aug 4.3 0.0 0.0 0.0
Sep 1.4 0.0 0.1 0.0
Oct 0.0 0.0 4.4 0.0
Nov 0.0 2.7 17.7 0.1
Dec 0.0 12.1 27.6 3.3
         
Annual 17.4 47.4 129.3 13.4
Winter 0.0 40.9 81.4 13.1
Spring 0.5 3.6 25.4 0.1
Summer 15.4 0.0 0.0 0.0
Fall 1.5 2.8 22.4 0.1

Snowfall Summary

Station: 113320 GALESBURG, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 8.3 5.2 2.8 1.5 0.0 0.0 0.0 0.0 0.0 0.1 1.8 5.8 25.5

Snowfall Extremes

Period of Record: 1895-2006

Month High (in) Year 1-Day Max (in) Date
Jan 27.0 1979 10.5 01-25-1895
Feb 17.0 - 11.0 02-18-1908
Mar 21.2 1960 9.6 03-16-1960
Apr 13.8 1982 11.0 04-11-1997
May 0.2 1994 7.7 05-19-1900
Jun 0.0 - - -
Jul 0.0 - 13.8 07-14-1895
Aug 0.0 - - -
Sep 0.0 - - -
Oct 2.0 1898 2.0 10-26-1898
Nov 8.9 1951 7.5 11-06-1951
Dec 22.0 2000 10.5 12-01-2006
Season (Jul-Jun) 49.5 1959-1960 13.8 07-14-1895

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 3.9 1.7 1.0 0.1
Feb 3.9 1.7 1.0 0.1
Mar 1.8 1.1 0.5 0.1
Apr 0.5 0.3 0.3 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 0.0 0.0 0.0
Nov 1.3 0.6 0.3 0.1
Dec 3.5 1.9 1.3 0.2
Annual 16.7 8.6 4.9 0.9

Growing Season Summary

Station: 113320 GALESBURG, 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 5 23 118 345 682 940 1094 1024 757 423 115 18 5534
45 1 8 64 225 528 790 939 869 608 288 60 7 4383
50 0 2 32 129 380 640 784 714 461 176 27 2 3346
55 0 0 13 65 246 491 629 559 322 95 9 0 2431
60 0 0 4 28 138 344 474 405 200 41 2 0 1639
50** 3 14 73 200 414 628 752 696 478 244 62 9 3570

**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 4/16 3/24 4/02 5/03 5/07 10/14 9/19 10/02 11/03 11/07
30 4/13 3/24 4/01 4/29 5/07 10/20 9/30 10/04 11/05 11/12
28 4/08 3/24 3/27 4/20 4/22 10/30 10/02 10/09 11/12 11/16
24 4/04 3/15 3/22 4/12 4/18 11/06 10/20 10/23 11/18 11/28
20 3/22 2/22 3/08 4/07 4/09 11/15 10/20 11/04 12/02 12/21
16 3/15 2/07 2/13 4/01 4/09 12/01 11/01 11/08 12/15 12/21

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 180 150 159 205 212
30 190 150 175 211 226
28 200 176 183 222 227
24 216 191 203 234 238
20 237 194 218 269 282
16 262 220 233 285 310

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