Precipitation Summary
Station: 118860 VIRDEN, IL
1971-2000 NCDC Normals
| Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Prec. (in) | 1.85 | 2.02 | 3.22 | 3.59 | 4.37 | 3.92 | 3.62 | 3.06 | 2.95 | 2.58 | 3.34 | 2.53 | 37.05 |
Precipitation Extremes
Period of Record: 1941-2006
| Month | High (in) | Year | Low (in) | Year | 1-Day Max (in) |
Date |
|---|---|---|---|---|---|---|
| Jan | 6.21 | 1950 | 0.03 | 1986 | 3.00 | 01-10-1975 |
| Feb | 5.09 | 1990 | 0.15 | 1947 | 2.06 | 02-27-1997 |
| Mar | 8.22 | 1973 | 0.64 | 1956 | 2.38 | 03-08-1964 |
| Apr | 11.41 | 1994 | 0.86 | 1971 | 3.98 | 04-12-1994 |
| May | 13.33 | 1943 | 0.99 | 1987 | 3.77 | 05-02-1983 |
| Jun | 9.50 | 1947 | 0.07 | 1959 | 4.30 | 06-06-2001 |
| Jul | 13.23 | 1958 | 0.18 | 1997 | 4.30 | 07-04-1981 |
| Aug | 9.36 | 1946 | 0.11 | 1971 | 2.83 | 08-29-1975 |
| Sep | 8.75 | 1945 | 0.00 | 2004 | 4.75 | 09-19-1966 |
| Oct | 9.06 | 1941 | 0.09 | 1964 | 3.05 | 10-05-2000 |
| Nov | 9.61 | 1985 | 0.30 | 1965 | 2.66 | 11-22-1942 |
| Dec | 7.37 | 1982 | 0.30 | 1958 | 4.25 | 12-03-1982 |
| Annual | 54.14 | 1982 | 25.74 | 1951 | 4.75 | 09-19-1966 |
| Winter | 13.30 | 1950 | 1.68 | 1963 | 4.25 | 12-03-1982 |
| Spring | 18.24 | 1943 | 5.24 | 2005 | 3.98 | 04-12-1994 |
| Summer | 23.67 | 1981 | 3.82 | 1966 | 4.30 | 06-06-2001 |
| Fall | 16.81 | 1941 | 3.87 | 1956 | 4.75 | 09-19-1966 |
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 | 6.6 | 4.6 | 1.0 | 0.2 |
| Feb | 6.9 | 4.4 | 1.5 | 0.4 |
| Mar | 9.2 | 7.0 | 2.3 | 0.6 |
| Apr | 9.8 | 6.8 | 2.2 | 0.8 |
| May | 9.1 | 6.9 | 3.1 | 1.2 |
| Jun | 8.1 | 6.3 | 2.7 | 1.4 |
| Jul | 7.3 | 5.0 | 2.6 | 1.2 |
| Aug | 7.2 | 5.1 | 2.0 | 1.0 |
| Sep | 6.7 | 5.0 | 2.4 | 0.6 |
| Oct | 7.3 | 5.0 | 1.8 | 0.7 |
| Nov | 8.3 | 6.3 | 2.4 | 1.0 |
| Dec | 6.8 | 4.6 | 1.7 | 0.5 |
| Annual | 93.4 | 67.2 | 25.6 | 9.7 |
| Winter | 20.3 | 13.6 | 4.2 | 1.2 |
| Spring | 28.1 | 20.7 | 7.6 | 2.6 |
| Summer | 22.7 | 16.5 | 7.2 | 3.6 |
| Fall | 22.3 | 16.3 | 6.6 | 2.3 |
Temperature Summary
Station 118860 VIRDEN, IL
1971-2000 NCDC Normals
| Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 34.8 | 40.7 | 53.0 | 65.7 | 75.8 | 84.2 | 87.9 | 86.2 | 80.2 | 68.2 | 52.3 | 39.4 | 64.0 |
| Low °F | 18.4 | 23.5 | 33.2 | 43.5 | 53.6 | 62.4 | 65.8 | 63.5 | 55.9 | 45.2 | 34.4 | 23.6 | 43.6 |
| Mean °F | 26.6 | 32.1 | 43.1 | 54.6 | 64.7 | 73.3 | 76.9 | 74.9 | 68.1 | 56.7 | 43.4 | 31.5 | 53.8 |
| HDD | 1189 | 921 | 679 | 325 | 127 | 9 | 0 | 8 | 53 | 280 | 649 | 1038 | 5278 |
| CDD | 0 | 0 | 0 | 13 | 118 | 259 | 366 | 313 | 143 | 24 | 0 | 0 | 1236 |
HDD – heating degree days (base 65F); CDD – cooling degree days (base 65F)
Temperature Extremes
Period of Record: 1948-2006
| Month | High Mean °F |
Year | Low Mean °F |
Year | 1-Day Max °F |
Date | 1-Day Min °F |
Date |
|---|---|---|---|---|---|---|---|---|
| Jan | 40.0 | 2006 | 11.7 | 1977 | 71 | 01-25-1950 | -22 | 01-17-1977 |
| Feb | 41.4 | 1998 | 18.3 | 1979 | 75 | 02-29-1972 | -19 | 02-03-1996 |
| Mar | 49.7 | 1973 | 26.8 | 1960 | 85 | 03-29-1986 | -9 | 03-05-1960 |
| Apr | 61.4 | 1981 | 48.0 | 1950 | 90 | 04-25-1986 | 19 | 04-01-1954 |
| May | 71.7 | 1962 | 59.1 | 1961 | 95 | 05-26-1953 | 27 | 05-10-1966 |
| Jun | 78.6 | 1952 | 67.9 | 1974 | 107 | 06-26-1954 | 40 | 06-03-1969 |
| Jul | 82.3 | 1954 | 72.1 | 1971 | 114 | 07-14-1954 | 44 | 07-14-1975 |
| Aug | 81.6 | 1983 | 69.8 | 1950 | 105 | 08-20-1983 | 39 | 08-28-1986 |
| Sep | 74.0 | 2005 | 61.2 | 1949 | 101 | 09-29-1953 | 30 | 09-23-1974 |
| Oct | 66.5 | 1963 | 50.2 | 1976 | 93 | 10-07-1963 | 18 | 10-29-1952 |
| Nov | 52.1 | 2001 | 35.3 | 1996 | 83 | 11-01-1950 | -4 | 11-25-1950 |
| Dec | 39.9 | 1982 | 17.7 | 1983 | 74 | 12-03-1970 | -20 | 12-21-1989 |
| Annual | 59.1 | 1969 | 51.3 | 1960 | 114 | 07-14-1954 | -22 | 01-17-1977 |
| Winter | 36.6 | 2002 | 21.1 | 1978 | 75 | 02-29-1972 | -22 | 01-17-1977 |
| Spring | 59.0 | 1977 | 47.5 | 1960 | 95 | 05-26-1953 | -9 | 03-05-1960 |
| Summer | 79.0 | 1954 | 71.3 | 1950 | 114 | 07-14-1954 | 39 | 08-28-1986 |
| Fall | 60.7 | 1963 | 51.0 | 1976 | 101 | 09-29-1953 | -4 | 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 | 12.6 | 27.3 | 3.4 |
| Feb | 0.0 | 8.0 | 21.1 | 2.0 |
| Mar | 0.0 | 1.6 | 15.2 | 0.1 |
| Apr | 0.1 | 0.0 | 4.0 | 0.0 |
| May | 1.1 | 0.0 | 0.1 | 0.0 |
| Jun | 6.9 | 0.0 | 0.0 | 0.0 |
| Jul | 12.7 | 0.0 | 0.0 | 0.0 |
| Aug | 9.3 | 0.0 | 0.0 | 0.0 |
| Sep | 4.3 | 0.0 | 0.1 | 0.0 |
| Oct | 0.1 | 0.0 | 3.3 | 0.0 |
| Nov | 0.0 | 1.1 | 14.0 | 0.0 |
| Dec | 0.0 | 7.6 | 24.8 | 1.6 |
| Annual | 34.6 | 30.5 | 109.4 | 7.0 |
| Winter | 0.0 | 28.2 | 73.3 | 6.9 |
| Spring | 1.2 | 1.5 | 19.1 | 0.1 |
| Summer | 28.9 | 0.0 | 0.0 | 0.0 |
| Fall | 4.4 | 1.1 | 17.5 | 0.0 |
Snowfall Summary
Station: 118860 VIRDEN, IL
1971-2000 Averages
| Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snow (in) | 7.2 | 6.3 | 4.0 | 0.6 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.5 | 4.8 | 24.4 |
Snowfall Extremes
Period of Record: 1941-2006
| Month | High (in) | Year | 1-Day Max (in) | Date |
|---|---|---|---|---|
| Jan | 28.0 | 1977 | 8.1 | 01-13-1964 |
| Feb | 17.5 | 1993 | 8.0 | 02-28-1984 |
| Mar | 23.5 | 1978 | 8.0 | 03-08-1978 |
| Apr | 6.0 | 1980 | 4.0 | 04-14-1980 |
| May | 0.0 | – | – | – |
| Jun | 0.0 | – | – | – |
| Jul | 0.0 | – | – | – |
| Aug | 0.0 | – | – | – |
| Sep | 0.0 | – | – | – |
| Oct | 0.0 | – | – | – |
| Nov | 9.5 | 1951 | 8.8 | 11-06-1951 |
| Dec | 26.0 | 1973 | 11.0 | 12-19-1973 |
| Season (Jul-Jun) | 65.8 | 1977-1978 | 11.0 | 12-19-1973 |
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 | 2.9 | 2.5 | 1.5 | 0.3 |
| Feb | 2.9 | 2.5 | 1.5 | 0.3 |
| Mar | 1.5 | 1.3 | 0.8 | 0.2 |
| Apr | 0.3 | 0.3 | 0.2 | 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 | 0.7 | 0.5 | 0.3 | 0.1 |
| Dec | 2.0 | 1.8 | 1.0 | 0.3 |
| Annual | 10.7 | 9.0 | 5.5 | 1.2 |
Growing Season Summary
Station: 118860 VIRDEN, 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 | 20 | 55 | 193 | 444 | 767 | 995 | 1136 | 1065 | 843 | 527 | 187 | 43 | 6235 |
| 45 | 7 | 24 | 112 | 312 | 614 | 847 | 983 | 913 | 694 | 382 | 109 | 20 | 4980 |
| 50 | 2 | 8 | 59 | 197 | 461 | 698 | 829 | 761 | 546 | 252 | 56 | 8 | 3848 |
| 55 | 0 | 1 | 28 | 110 | 318 | 550 | 676 | 609 | 401 | 147 | 24 | 2 | 2840 |
| 60 | 0 | 0 | 10 | 52 | 192 | 403 | 522 | 457 | 269 | 72 | 8 | 0 | 1964 |
| 50** | 11 | 31 | 114 | 267 | 487 | 675 | 779 | 725 | 553 | 322 | 103 | 23 | 4065 |
**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 | 3/27 | 4/02 | 4/28 | 5/09 | 10/16 | 9/23 | 9/27 | 11/03 | 11/06 |
| 30 | 4/09 | 3/18 | 3/26 | 4/20 | 5/04 | 10/24 | 9/23 | 10/06 | 11/05 | 11/10 |
| 28 | 4/06 | 3/18 | 3/19 | 4/13 | 4/19 | 10/31 | 10/02 | 10/13 | 11/14 | 11/23 |
| 24 | 3/21 | 3/02 | 3/11 | 4/11 | 4/18 | 11/12 | 10/19 | 10/23 | 12/01 | 12/11 |
| 20 | 3/18 | 2/16 | 2/28 | 4/08 | 4/10 | 11/17 | 10/20 | 11/03 | 12/11 | 12/22 |
| 16 | 3/07 | 1/20 | 2/07 | 3/15 | 3/25 | 12/01 | 11/03 | 11/09 | 12/22 | 12/31 |
Length of Growing Season (Days)
Derived from 1971-2000 Averages
| Temp °F | Median | Shortest | 10% | 90% | Longest |
|---|---|---|---|---|---|
| 32 | 184 | 152 | 160 | 207 | 215 |
| 30 | 199 | 166 | 172 | 212 | 228 |
| 28 | 210 | 176 | 189 | 228 | 243 |
| 24 | 229 | 189 | 202 | 255 | 272 |
| 20 | 251 | 194 | 220 | 277 | 284 |
| 16 | 272 | 237 | 248 | 302 | 335 |
Copyright 2007 Illinois State Water Survey
Last Modified: September 11, 2007