Historical Climate Data

Precipitation Summary

Station: 112736 ELGIN, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.68 1.38 2.23 3.91 3.84 4.31 3.93 4.43 3.63 2.66 3.12 2.10 37.22

Precipitation Extremes

Period of Record: 1898-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 4.49 1907 0.00 1981 2.67 01-24-1938
Feb 5.74 1925 0.04 1987 3.17 02-21-1997
Mar 5.55 1922 0.20 1986 2.97 03-25-1954
Apr 8.53 1999 0.68 1899 2.65 04-22-1973
May 8.70 1996 0.47 1992 3.84 05-25-1922
Jun 10.40 1993 0.24 1922 5.00 06-25-1898
Jul 7.64 1957 0.11 1946 4.00 07-22-1976
Aug 11.36 1987 0.64 1930 4.93 08-22-2002
Sep 13.69 1961 0.01 1979 3.59 09-13-1936
Oct 8.03 1941 0.05 1952 3.32 10-11-1954
Nov 8.42 1985 0.25 1917 2.25 11-03-1935
Dec 5.49 1971 0.29 1930 2.60 12-03-1982
             
Annual 52.99 1925 21.51 1920 5.00 06-25-1898
Winter 10.35 1974 1.42 1961 3.17 02-21-1997
Spring 16.45 1922 2.94 1934 3.84 05-25-1922
Summer 21.23 1979 4.02 1922 5.00 06-25-1898
Fall 20.61 1961 1.95 1956 3.59 09-13-1936

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 7.7 4.6 1.2 0.3
Feb 5.9 3.5 0.7 0.1
Mar 8.5 5.4 1.4 0.3
Apr 11.6 7.6 2.9 1.1
May 11.1 7.3 2.5 1.0
Jun 9.9 7.0 3.1 1.0
Jul 9.6 6.2 2.6 1.2
Aug 10.1 7.1 2.8 1.4
Sep 8.7 6.0 2.4 1.2
Oct 8.6 5.1 1.6 0.5
Nov 10.4 6.5 1.9 0.6
Dec 9.0 5.2 1.2 0.3
         
Annual 111.2 71.6 24.5 9.2
Winter 22.6 13.3 3.1 0.8
Spring 31.2 20.2 6.7 2.4
Summer 29.6 20.2 8.6 3.6
Fall 27.6 17.6 5.9 2.3

Temperature Summary

Station 112736 ELGIN, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 27.6 32.9 44.3 57.5 69.4 79.4 83.0 81.0 74.0 62.0 46.4 33.1 57.6
Low °F 10.9 15.7 26.0 36.4 47.4 56.7 62.1 60.2 51.4 39.5 29.1 17.3 37.7
Mean °F 19.3 24.3 35.2 47.0 58.4 68.1 72.6 70.6 62.7 50.8 37.8 25.2 47.7
HDD 1419 1140 926 543 252 43 6 29 120 445 817 1235 6975
CDD 0 0 0 1 48 135 240 201 50 4 0 0 679

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

Temperature Extremes

Period of Record: 1897-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 34.0 2006 5.5 1977 62 01-05-1997 -27 01-20-1985
Feb 37.8 1998 12.2 1979 70 02-26-2000 -23 02-09-1899
Mar 45.4 1921 26.9 1912 82 03-23-1907 -8 03-04-2002
Apr 56.8 1915 40.4 1907 91 04-27-1986 11 04-06-1979
May 65.8 1911 53.2 1983 94 05-26-1911 28 05-03-2004
Jun 74.8 1921 62.5 1982 101 06-26-1988 36 06-09-1913
Jul 79.7 1921 68.4 1992 103 07-01-1910 41 07-03-1924
Aug 77.5 1995 65.5 1992 102 08-12-1918 38 08-31-1915
Sep 69.8 1925 58.6 1993 99 09-05-1899 25 09-30-1899
Oct 59.1 1920 42.8 1925 89 10-15-1975 11 10-29-1925
Nov 47.7 2001 29.5 1976 76 11-07-1915 -7 11-29-1976
Dec 36.7 1923 13.7 1983 67 12-06-2001 -24 12-24-1983
                 
Annual 53.0 1921 42.6 1985 103 07-01-1910 -27 01-20-1985
Winter 31.6 1998 13.3 1979 70 02-26-1900 -27 01-20-1985
Spring 54.0 1921 42.3 1996 94 05-26-1911 -8 03-04-1902
Summer 75.6 1921 66.5 1992 103 07-01-1910 36 06-09-1913
Fall 55.6 1922 45.0 1976 99 09-05-1999 -7 11-29-1976

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 20.0 29.8 7.9
Feb 0.0 13.0 26.1 4.8
Mar 0.0 5.1 23.9 0.4
Apr 0.0 0.2 9.5 0.0
May 0.4 0.0 0.5 0.0
Jun 3.2 0.0 0.0 0.0
Jul 4.8 0.0 0.0 0.0
Aug 2.8 0.0 0.0 0.0
Sep 1.0 0.0 0.2 0.0
Oct 0.0 0.0 7.2 0.0
Nov 0.0 3.4 19.8 0.2
Dec 0.0 13.6 28.9 4.3
         
Annual 11.7 58.5 150.2 18.0
Winter 0.0 46.6 84.8 16.9
Spring 0.4 5.5 35.0 0.4
Summer 10.8 0.0 0.0 0.0
Fall 1.0 3.7 27.6 0.2

Snowfall Summary

Station: 112736 ELGIN, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 10.7 7.4 4.2 0.9 0.0 0.0 0.0 0.0 0.0 0.0 1.7 8.5 33.4

Snowfall Extremes

Period of Record: 1898-2006

Month High (in) Year 1-Day Max (in) Date
Jan 52.0 1979 16.5 01-13-1966
Feb 19.3 1960 10.0 02-10-1960
Mar 24.5 1972 11.0 03-26-1970
Apr 13.0 1975 12.0 04-03-1975
May 2.0 1966 2.0 05-11-1966
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 4.0 1967 4.0 10-27-1967
Nov 8.2 1955 4.0 11-27-1978
Dec 32.0 1978 12.0 12-23-1959
Season (Jul-Jun) 100.1 1978-1979 16.5 01-13-1966

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 2.9 1.6 0.3
Feb 3.9 2.9 1.6 0.3
Mar 2.1 1.5 0.8 0.2
Apr 0.4 0.2 0.1 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 0.0 0.0 0.0 0.0
Nov 1.4 0.8 0.4 0.0
Dec 4.4 2.8 1.5 0.5
Annual 17.8 12.1 6.2 1.4

Growing Season Summary

Station: 112736 ELGIN, 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 2 11 74 249 583 846 1016 942 691 333 92 10 4592
45 0 3 39 148 432 697 862 789 542 209 46 3 3570
50 0 0 18 78 292 547 708 636 396 119 20 1 2668
55 0 0 7 39 176 400 554 483 259 57 6 0 1880
60 0 0 2 17 94 263 401 332 151 22 1 0 1218
50** 1 7 49 149 347 545 689 626 427 201 50 5 2932

**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 4/26 4/09 4/16 5/09 5/28 10/11 9/23 9/30 10/22 11/02
30 4/21 3/28 4/05 5/01 5/09 10/16 9/23 10/04 10/28 11/07
28 4/17 3/27 4/04 4/27 4/29 10/25 10/08 10/10 11/15 11/19
24 4/06 3/14 3/21 4/14 4/22 11/06 10/14 10/23 11/20 11/30
20 3/22 3/03 3/13 4/09 4/19 11/13 10/24 10/31 12/06 12/22
16 3/17 2/13 2/27 4/05 4/07 11/22 11/03 11/09 12/12 12/22

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 166 143 156 182 193
30 177 158 163 204 212
28 193 172 175 216 225
24 215 193 199 240 248
20 233 207 209 261 282
16 253 218 222 284 286

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