Historical Climate Data

Precipitation Summary

Station: 112687 EFFINGHAM, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 2.38 2.51 3.61 4.09 4.46 4.26 4.51 2.92 3.04 2.95 4.05 3.27 42.05

Precipitation Extremes

Period of Record: 1892-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 9.99 1950 0.05 1986 3.82 01-03-1950
Feb 5.95 1990 0.23 1947 2.75 02-07-1999
Mar 12.77 1898 0.58 1941 3.30 03-14-1922
Apr 9.57 1994 0.89 1900 2.75 04-08-1929
May 12.89 1943 0.58 1913 4.41 05-01-1946
Jun 12.47 1957 0.34 1992 5.02 06-16-1970
Jul 11.66 2000 0.33 1921 5.25 07-05-2000
Aug 10.25 1915 0.02 1943 5.66 08-13-1973
Sep 13.64 1911 0.17 2004 5.22 09-29-1955
Oct 9.60 1919 0.08 1896 3.99 10-11-1949
Nov 10.36 1985 0.26 1904 3.17 11-01-1946
Dec 9.89 1967 0.25 1958 3.27 12-30-1990
             
Annual 65.18 1927 18.47 1894 5.66 08-13-1973
Winter 18.68 1950 2.90 1943 3.82 01-03-1950
Spring 25.22 1927 4.26 1914 4.41 05-01-1946
Summer 26.30 2000 3.28 1984 5.66 08-13-1973
Fall 19.76 1993 3.40 1901 5.22 09-29-1955

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 8.8 4.9 1.2 0.4
Feb 8.3 4.9 1.6 0.7
Mar 10.5 7.2 2.6 0.6
Apr 12.1 8.0 2.5 0.8
May 10.2 7.6 3.4 1.0
Jun 9.5 6.9 2.7 1.0
Jul 9.1 6.9 3.1 1.4
Aug 7.4 5.0 2.2 0.8
Sep 6.5 4.5 2.3 1.0
Oct 7.9 5.2 2.0 0.9
Nov 10.1 7.0 2.9 1.3
Dec 9.6 5.9 2.3 1.0
         
Annual 110.2 74.1 29.0 10.9
Winter 26.7 15.7 5.2 2.1
Spring 32.8 22.8 8.4 2.4
Summer 26.0 18.7 8.1 3.3
Fall 24.5 16.7 7.2 3.1

Temperature Summary

Station 112687 EFFINGHAM, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 34.8 40.5 51.7 63.5 73.8 83.2 86.9 85.0 78.1 66.6 52.2 39.9 63.0
Low °F 17.8 21.6 31.8 41.9 52.0 61.5 65.7 63.3 54.8 43.2 33.7 23.1 42.5
Mean °F 26.3 31.1 41.8 52.7 62.9 72.4 76.3 74.2 66.5 54.9 43.0 31.5 52.8
HDD 1200 950 721 374 156 13 0 12 73 333 661 1040 5533
CDD 0 0 0 5 92 233 350 296 117 21 0 0 1114

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

Temperature Extremes

Period of Record: 1892-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 40.2 1933 9.7 1977 72 01-25-1950 -29 01-24-1915
Feb 42.4 1954 16.8 1978 78 02-29-1972 -21 02-13-1905
Mar 54.1 1946 28.7 1960 89 03-24-1929 -11 03-05-1978
Apr 61.1 1925 47.3 1950 91 04-23-1925 21 04-01-1923
May 72.9 1962 56.2 1917 98 05-29-1895 28 05-01-1903
Jun 80.2 1934 66.8 1916 106 06-26-1954 35 06-16-1917
Jul 86.2 1936 71.7 1947 111 07-15-1936 45 07-26-1911
Aug 83.7 1936 67.8 1915 110 08-04-1918 39 08-31-1915
Sep 77.2 1895 60.6 1918 105 09-04-1954 23 09-30-1899
Oct 67.3 1894 47.5 1976 95 10-03-1922 15 10-29-1952
Nov 52.4 1902 34.2 1976 83 11-01-1933 -6 11-25-1950
Dec 43.5 1923 19.1 1983 74 12-15-1948 -17 12-28-1924
                 
Annual 60.7 1918 49.5 1979 111 07-15-1936 -29 01-24-1915
Winter 40.1 1932 20.5 1978 78 02-29-1972 -29 01-24-1915
Spring 58.8 1921 48.1 1984 98 05-29-1995 -11 03-05-1978
Summer 81.4 1936 70.1 1915 111 07-15-1936 35 06-16-1917
Fall 63.6 1894 48.0 1976 105 09-04-1954 -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 13.6 27.5 3.6
Feb 0.0 7.9 22.5 2.5
Mar 0.0 1.9 16.6 0.2
Apr 0.0 0.0 4.5 0.0
May 0.7 0.0 0.3 0.0
Jun 6.2 0.0 0.0 0.0
Jul 11.3 0.0 0.0 0.0
Aug 8.4 0.0 0.0 0.0
Sep 2.8 0.0 0.0 0.0
Oct 0.0 0.0 4.9 0.0
Nov 0.0 1.0 14.2 0.0
Dec 0.0 7.7 24.7 2.1
         
Annual 30.1 31.4 113.4 8.2
Winter 0.0 29.0 74.6 8.2
Spring 0.8 1.9 21.1 0.2
Summer 25.9 0.0 0.0 0.0
Fall 2.9 1.0 19.1 0.0

Snowfall Summary

Station: 112687 EFFINGHAM, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 7.2 4.8 3.0 0.2 0.0 0.0 0.0 0.0 0.0 0.0 1.3 4.2 20.7

Snowfall Extremes

Period of Record: 1892-2006

Month High (in) Year 1-Day Max (in) Date
Jan 23.7 1979 10.2 01-10-1987
Feb 21.5 1993 9.0 02-26-1993
Mar 17.2 1978 9.0 03-24-1990
Apr 3.0 1973 3.0 04-10-1973
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 1.0 1913 1.0 10-29-1913
Nov 13.5 1980 10.0 11-27-1980
Dec 25.5 1973 14.5 12-20-1973
Season (Jul-Jun) 40.6 1977-1978 14.5 12-20-1973

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 2.8 1.7 1.2 0.2
Feb 2.8 1.7 1.2 0.2
Mar 1.3 1.0 0.6 0.2
Apr 0.2 0.1 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 0.0 0.0 0.0 0.0
Nov 0.6 0.5 0.3 0.1
Dec 2.3 1.5 0.9 0.2
Annual 11.3 7.4 4.2 0.8

Growing Season Summary

Station: 112687 EFFINGHAM, 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 18 46 176 409 721 980 1138 1068 807 475 192 44 6060
45 6 19 102 281 567 830 983 913 657 336 112 19 4819
50 1 6 54 174 416 680 828 758 509 216 59 7 3705
55 0 1 24 95 276 530 673 603 366 122 26 2 2719
60 0 0 9 45 158 382 518 449 239 57 8 0 1869
50** 11 29 106 242 448 660 783 725 523 292 108 24 3945

**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 4/13 3/28 3/31 5/09 5/12 10/15 10/02 10/03 11/05 11/10
30 4/10 3/24 3/29 4/25 5/12 10/21 10/03 10/08 11/05 11/20
28 4/06 3/08 3/23 4/12 4/19 11/02 10/05 10/10 11/14 11/23
24 3/23 2/28 3/10 4/09 4/19 11/12 10/14 10/25 12/04 12/11
20 3/14 2/19 2/28 3/25 3/25 11/18 10/24 10/31 12/07 12/11
16 2/26 1/28 2/08 3/19 3/25 12/07 11/04 11/12 12/21 12/26

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 186 144 155 202 215
30 199 163 167 212 225
28 210 183 187 229 249
24 234 191 213 254 260
20 252 225 229 275 286
16 282 237 254 311 323

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