Historical Climate Data

Precipitation Summary

Station: 112931 FAIRFIELD RADIO WFIW, IL


1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 2.78 2.70 4.62 4.80 4.73 4.20 3.83 3.35 2.90 3.31 4.33 3.45 45.00

Precipitation Extremes

Period of Record: 1887-2006


Month

High (in)

Year

Low (in)

Year
1-Day
Max (in)

Date
Jan 12.23 1949 0.30 1986 3.35 01-05-1917
Feb 6.83 1909 0.00 1947 3.14 02-09-1965
Mar 12.79 1945 0.08 1910 6.13 03-25-1913
Apr 11.11 1972 0.00 1915 4.11 04-24-1975
May 12.58 1961 0.12 1914 6.76 05-08-1961
Jun 10.31 2000 0.33 1991 3.78 06-27-1977
Jul 12.51 1969 0.21 1930 5.55 07-24-1969
Aug 8.94 2004 0.18 1943 5.01 08-26-2004
Sep 10.32 1926 0.02 2004 4.05 09-03-1926
Oct 16.00 1919 0.00 1908 6.48 10-27-1919
Nov 10.64 1985 0.39 1999 4.89 11-14-1993
Dec 9.81 1982 0.38 1955 4.00 12-03-1982
             
Annual 63.81 1927 24.31 1908 6.76 05-08-1961
Winter 18.68 1950 3.00 1931 4.00 12-03-1982
Spring 25.48 1927 4.38 1930 6.76 05-08-1961
Summer 21.83 1977 3.88 1930 5.55 07-24-1969
Fall 21.15 1919 3.49 1953 6.48 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 9.7 5.6 1.7 0.7
Feb 8.6 5.3 1.9 0.6
Mar 11.5 7.9 3.2 1.1
Apr 11.8 8.5 3.2 1.0
May 11.2 7.8 3.1 1.1
Jun 9.9 6.6 2.9 0.9
Jul 8.5 6.0 2.8 1.1
Aug 8.0 5.3 2.3 0.9
Sep 7.4 5.0 2.2 0.7
Oct 8.1 5.2 2.0 0.9
Nov 10.6 6.8 3.1 1.3
Dec 10.0 6.4 2.4 0.8
         
Annual 115.3 76.4 30.9 11.0
Winter 28.3 17.3 6.0 2.1
Spring 34.5 24.2 9.5 3.2
Summer 26.3 17.9 8.0 2.9
Fall 26.1 17.0 7.3 2.9


Temperature Summary

Station 112931 FAIRFIELD RADIO WFIW, IL


1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 37.0 43.2 54.3 65.7 75.6 85.0 88.2 86.6 79.6 68.3 53.4 41.7 64.9
Low °F 19.7 24.0 33.4 42.6 52.2 61.0 65.1 62.8 55.0 43.5 33.9 24.3 43.1
Mean °F 28.4 33.6 43.9 54.2 63.9 73.0 76.7 74.7 67.3 55.9 43.7 33.0 54.0
HDD 1136 879 656 335 135 8 0 7 60 307 641 992 5156
CDD 0 0 0 9 100 247 362 307 128 24 0 0 1177

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 42.7 1933 14.1 1977 77 01-24-1943 -23 01-17-1977
Feb 44.9 1938 21.3 1978 78 02-13-1962 -21 02-09-1899
Mar 56.8 1946 29.7 1960 91 03-24-1929 -8 03-06-1960
Apr 62.3 1981 48.2 1907 91 04-24-1925 17 04-07-1990
May 72.7 1962 58.8 1917 98 05-26-1911 29 05-01-1903
Jun 81.8 1934 68.1 1974 105 06-24-1914 39 06-01-1972
Jul 85.5 1936 73.3 1947 113 07-22-1901 45 07-26-1911
Aug 84.3 1936 70.2 1967 108 08-04-1918 43 08-29-1986
Sep 77.5 1925 62.2 1918 105 09-15-1939 25 09-30-1899
Oct 66.2 1947 50.4 1917 96 10-08-1939 19 10-21-1952
Nov 54.9 1909 36.8 1976 85 11-01-1933 -3 11-30-1929
Dec 45.1 1923 20.3 1989 74 12-07-1916 -18 12-22-1989
                 
Annual 60.0 1921 53.1 1904 113 07-22-1901 -23 01-17-1977
Winter 43.6 1932 24.4 1978 78 02-13-1962 -23 01-17-1977
Spring 60.4 1921 50.0 1960 98 05-26-1911 -8 03-06-1960
Summer 82.2 1936 72.0 1992 113 07-22-1901 39 06-01-1972
Fall 63.9 1931 51.2 1976 105 09-15-1939 -3 11-30-1929


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 10.5 26.0 2.1
Feb 0.0 5.7 20.3 1.2
Mar 0.0 1.1 14.2 0.1
Apr 0.0 0.0 4.2 0.0
May 0.9 0.0 0.2 0.0
Jun 7.8 0.0 0.0 0.0
Jul 13.2 0.0 0.0 0.0
Aug 9.6 0.0 0.0 0.0
Sep 3.7 0.0 0.1 0.0
Oct 0.1 0.0 4.2 0.0
Nov 0.0 0.6 12.9 0.0
Dec 0.0 6.0 22.2 1.0
         
Annual 35.2 23.9 104.5 4.4
Winter 0.0 22.2 68.4 4.3
Spring 0.9 1.1 18.6 0.1
Summer 30.6 0.0 0.0 0.0
Fall 3.8 0.6 17.2 0.0


Snowfall Summary

Station: 112931 FAIRFIELD RADIO WFIW, IL


1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 5.1 3.5 2.3 0.3 0.0 0.0 0.0 0.0 0.0 0.1 0.7 3.3 15.3

Snowfall Extremes

Period of Record: 1887-2006

Month High (in) Year 1-Day Max (in) Date
Jan 21.5 1977 8.0 01-25-1904
Feb 19.5 1910 12.0 02-26-1906
Mar 18.0 1960 10.0 03-19-1996
Apr 5.0 1971 5.0 04-06-1971
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 3.5 1925 2.5 10-30-1993
Nov 9.0 1958 9.0 11-28-1958
Dec 14.7 1917 9.0 12-27-1990
Season (Jul-Jun) 39.8 1911-1912 12.0 02-26-1906

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 1.7 1.3 0.6 0.2
Feb 1.7 1.3 0.6 0.2
Mar 0.8 0.6 0.4 0.2
Apr 0.1 0.1 0.1 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 0.4 0.3 0.1 0.0
Dec 1.6 1.2 0.7 0.2
Annual 7.8 5.8 3.0 0.9


Growing Season Summary

Station: 112931 FAIRFIELD RADIO WFIW, 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 34 75 225 462 768 1001 1150 1091 845 526 213 64 6427
45 14 37 136 326 613 851 995 937 695 380 129 30 5120
50 5 15 75 208 460 702 840 782 546 251 69 13 3947
55 1 4 36 118 314 552 685 627 401 148 31 4 2908
60 0 1 13 57 188 403 530 472 267 72 10 0 2006
50** 19 45 135 281 489 676 786 741 553 330 119 33 4190

**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 4/14 3/24 4/04 5/02 5/10 10/11 9/22 10/01 10/30 11/06
30 4/11 3/24 3/29 4/26 5/05 10/21 10/02 10/06 11/06 11/13
28 4/06 3/07 3/21 4/12 4/19 10/27 10/10 10/14 11/12 11/23
24 3/26 2/28 3/13 4/10 4/19 11/09 10/14 10/24 11/28 12/04
20 3/12 2/22 2/27 3/27 4/07 11/22 10/23 11/02 12/10 12/21
16 2/23 1/15 2/07 3/16 3/26 12/07 11/04 11/10 12/22 1/02

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 177 151 160 199 214
30 193 159 174 212 216
28 208 183 191 228 235
24 226 206 210 254 261
20 254 219 228 281 287
16 284 236 248 311 340

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