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 |
Copyright 2007 Illinois State Water Survey
Last Modified: September 11, 2007