Precipitation Summary
Station: 114489 JERSEYVILLE 2 SW, IL
1971-2000 NCDC Normals
| Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Prec. (in) | 1.92 | 2.01 | 3.51 | 4.14 | 3.95 | 3.68 | 3.51 | 2.91 | 3.23 | 2.86 | 3.77 | 2.82 | 38.31 |
Precipitation Extremes
Period of Record: 1940-2006
| Month | High (in) | Year | Low (in) | Year | 1-Day Max (in) |
Date |
|---|---|---|---|---|---|---|
| Jan | 7.74 | 2005 | 0.03 | 1986 | 2.21 | 01-04-1993 |
| Feb | 6.49 | 1951 | 0.26 | 2006 | 2.13 | 02-26-1957 |
| Mar | 7.09 | 1948 | 0.55 | 1971 | 2.82 | 03-12-1977 |
| Apr | 12.36 | 1994 | 1.12 | 1976 | 3.22 | 04-24-1975 |
| May | 12.10 | 2002 | 0.67 | 1986 | 3.73 | 05-02-1983 |
| Jun | 9.70 | 1957 | 0.17 | 1959 | 3.57 | 06-12-2002 |
| Jul | 8.44 | 1942 | 0.66 | 1997 | 2.67 | 07-14-1955 |
| Aug | 10.19 | 1961 | 0.12 | 1984 | 5.81 | 08-11-1961 |
| Sep | 10.71 | 1993 | 0.00 | 1940 | 3.78 | 09-09-1989 |
| Oct | 9.66 | 1941 | 0.32 | 1964 | 3.74 | 10-12-1969 |
| Nov | 10.28 | 1985 | 0.09 | 1949 | 3.52 | 11-18-2003 |
| Dec | 9.31 | 1982 | 0.06 | 1958 | 5.12 | 12-03-1982 |
| Annual | 53.22 | 1993 | 24.43 | 1980 | 5.81 | 08-11-1961 |
| Winter | 12.47 | 1950 | 2.24 | 1981 | 5.12 | 12-03-1982 |
| Spring | 20.98 | 2002 | 2.80 | 1986 | 3.73 | 05-02-1983 |
| Summer | 19.25 | 1942 | 3.45 | 1984 | 5.81 | 08-11-1961 |
| Fall | 18.01 | 1993 | 3.32 | 1940 | 3.78 | 09-09-1989 |
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 | 7.4 | 4.2 | 1.2 | 0.3 |
| Feb | 6.7 | 4.1 | 1.3 | 0.5 |
| Mar | 9.7 | 6.8 | 2.6 | 0.8 |
| Apr | 11.2 | 7.0 | 2.8 | 0.9 |
| May | 11.1 | 7.4 | 2.9 | 1.0 |
| Jun | 8.8 | 6.1 | 2.9 | 1.1 |
| Jul | 8.3 | 5.8 | 2.6 | 1.1 |
| Aug | 7.2 | 4.9 | 1.9 | 0.8 |
| Sep | 7.7 | 5.1 | 2.3 | 0.9 |
| Oct | 8.8 | 5.7 | 2.0 | 0.7 |
| Nov | 9.2 | 6.6 | 2.9 | 1.1 |
| Dec | 7.9 | 5.2 | 1.7 | 0.8 |
| Annual | 104.0 | 68.8 | 26.9 | 9.9 |
| Winter | 22.1 | 13.5 | 4.2 | 1.6 |
| Spring | 32.1 | 21.3 | 8.3 | 2.8 |
| Summer | 24.2 | 16.7 | 7.3 | 2.9 |
| Fall | 25.7 | 17.4 | 7.1 | 2.6 |
Temperature Summary
Station 114489 JERSEYVILLE 2 SW, IL
1971-2000 NCDC Normals
| Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 35.3 | 41.3 | 52.5 | 64.2 | 74.3 | 83.1 | 87.5 | 85.9 | 78.8 | 67.6 | 52.5 | 40.0 | 63.6 |
| Low °F | 17.3 | 22.2 | 32.2 | 42.1 | 52.1 | 61.4 | 65.7 | 63.1 | 54.6 | 43.3 | 33.6 | 22.8 | 42.5 |
| Mean °F | 26.3 | 31.8 | 42.4 | 53.2 | 63.2 | 72.3 | 76.6 | 74.5 | 66.7 | 55.5 | 43.1 | 31.4 | 53.1 |
| HDD | 1200 | 932 | 702 | 364 | 150 | 12 | 0 | 9 | 71 | 310 | 658 | 1041 | 5449 |
| CDD | 0 | 0 | 0 | 8 | 93 | 228 | 360 | 302 | 121 | 13 | 0 | 0 | 1125 |
HDD – heating degree days (base 65F); CDD – cooling degree days (base 65F)
Temperature Extremes
Period of Record: 1940-2006
| Month | High Mean °F |
Year | Low Mean °F |
Year | 1-Day Max °F |
Date | 1-Day Min °F |
Date |
|---|---|---|---|---|---|---|---|---|
| Jan | 39.0 | 2006 | 10.3 | 1977 | 74 | 01-24-1950 | -25 | 01-17-1977 |
| Feb | 42.8 | 1954 | 17.1 | 1978 | 80 | 02-29-1972 | -22 | 02-09-1979 |
| Mar | 50.4 | 1973 | 28.6 | 1960 | 86 | 03-29-1985 | -11 | 03-05-1960 |
| Apr | 61.9 | 1954 | 47.8 | 1983 | 92 | 04-28-1951 | 18 | 04-02-1961 |
| May | 71.4 | 1962 | 57.9 | 1981 | 96 | 05-26-1953 | 28 | 05-04-1976 |
| Jun | 80.9 | 1952 | 67.6 | 1982 | 104 | 06-26-1954 | 37 | 06-01-1972 |
| Jul | 82.6 | 1954 | 72.2 | 1967 | 112 | 07-14-1954 | 43 | 07-27-1962 |
| Aug | 79.9 | 1983 | 68.4 | 1992 | 105 | 08-03-1964 | 38 | 08-29-1986 |
| Sep | 72.1 | 1960 | 61.4 | 1974 | 102 | 09-04-1954 | 27 | 09-23-1983 |
| Oct | 67.4 | 1963 | 49.7 | 1976 | 93 | 10-02-1953 | 17 | 10-21-1952 |
| Nov | 50.3 | 2001 | 35.5 | 1976 | 84 | 11-01-1950 | -2 | 11-30-1964 |
| Dec | 41.0 | 1965 | 17.3 | 1983 | 74 | 12-15-1948 | -19 | 12-30-1983 |
| Annual | 57.2 | 1953 | 47.0 | 1979 | 112 | 07-14-1954 | -25 | 01-17-1977 |
| Winter | 37.2 | 1950 | 20.9 | 1978 | 80 | 02-29-1972 | -25 | 01-17-1977 |
| Spring | 58.2 | 1977 | 48.6 | 2001 | 96 | 05-26-1953 | -11 | 03-05-1960 |
| Summer | 79.5 | 1954 | 71.0 | 2004 | 112 | 07-14-1954 | 37 | 06-01-1972 |
| Fall | 61.5 | 1963 | 49.8 | 1976 | 102 | 09-04-1954 | -2 | 11-30-1964 |
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 | 12.3 | 28.1 | 3.7 |
| Feb | 0.0 | 7.1 | 22.6 | 2.2 |
| Mar | 0.0 | 1.7 | 16.5 | 0.1 |
| Apr | 0.1 | 0.0 | 4.9 | 0.0 |
| May | 0.6 | 0.0 | 0.3 | 0.0 |
| Jun | 5.5 | 0.0 | 0.0 | 0.0 |
| Jul | 12.5 | 0.0 | 0.0 | 0.0 |
| Aug | 9.3 | 0.0 | 0.0 | 0.0 |
| Sep | 3.3 | 0.0 | 0.3 | 0.0 |
| Oct | 0.0 | 0.0 | 5.0 | 0.0 |
| Nov | 0.0 | 1.2 | 15.1 | 0.0 |
| Dec | 0.0 | 7.4 | 25.6 | 1.7 |
| Annual | 31.4 | 30.0 | 118.6 | 7.9 |
| Winter | 0.0 | 26.8 | 76.4 | 7.7 |
| Spring | 0.7 | 1.7 | 21.9 | 0.1 |
| Summer | 27.5 | 0.0 | 0.0 | 0.0 |
| Fall | 3.4 | 1.2 | 20.0 | 0.0 |
Snowfall Summary
Station: 114489 JERSEYVILLE 2 SW, IL
1971-2000 Averages
| Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snow (in) | 5.1 | 3.6 | 2.9 | 0.5 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.2 | 3.7 | 17.0 |
Snowfall Extremes
Period of Record: 1940-2006
| Month | High (in) | Year | 1-Day Max (in) | Date |
|---|---|---|---|---|
| Jan | 18.0 | 1979 | 7.5 | 01-02-1999 |
| Feb | 18.0 | 1993 | 8.0 | 02-16-1993 |
| Mar | 24.8 | 1960 | 11.0 | 03-24-1990 |
| 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 | 0.0 | – | – | – |
| Nov | 8.0 | 1951 | 8.0 | 11-06-1951 |
| Dec | 26.0 | 1973 | 12.0 | 12-31-1973 |
| Season (Jul-Jun) | 45.7 | 1977-1978 | 12.0 | 12-31-1973 |
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 | 1.8 | 1.4 | 0.9 | 0.1 |
| Feb | 1.8 | 1.4 | 0.9 | 0.1 |
| Mar | 0.9 | 0.8 | 0.5 | 0.2 |
| Apr | 0.2 | 0.2 | 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 | 0.0 | 0.0 | 0.0 | 0.0 |
| Nov | 0.5 | 0.4 | 0.2 | 0.1 |
| Dec | 1.7 | 1.3 | 0.7 | 0.2 |
| Annual | 7.9 | 6.4 | 3.6 | 0.9 |
Growing Season Summary
Station: 114489 JERSEYVILLE 2 SW, 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 | 22 | 57 | 188 | 419 | 733 | 972 | 1138 | 1073 | 806 | 486 | 183 | 44 | 6060 |
| 45 | 7 | 25 | 110 | 289 | 579 | 822 | 984 | 918 | 656 | 345 | 107 | 18 | 4816 |
| 50 | 2 | 9 | 60 | 181 | 428 | 673 | 829 | 763 | 508 | 223 | 56 | 7 | 3704 |
| 55 | 0 | 2 | 29 | 101 | 287 | 524 | 675 | 608 | 366 | 127 | 23 | 2 | 2720 |
| 60 | 0 | 0 | 10 | 48 | 168 | 378 | 520 | 453 | 239 | 59 | 7 | 0 | 1869 |
| 50** | 15 | 39 | 117 | 250 | 461 | 654 | 777 | 725 | 526 | 306 | 108 | 28 | 3969 |
**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 | 4/17 | 3/28 | 4/06 | 5/09 | 5/17 | 10/10 | 9/21 | 9/23 | 10/21 | 11/03 |
| 30 | 4/10 | 3/24 | 3/27 | 4/26 | 5/09 | 10/17 | 9/23 | 10/01 | 11/05 | 11/10 |
| 28 | 4/05 | 3/07 | 3/25 | 4/15 | 5/05 | 10/22 | 9/23 | 10/04 | 11/05 | 11/10 |
| 24 | 3/23 | 3/06 | 3/12 | 4/11 | 4/19 | 11/04 | 10/07 | 10/16 | 11/30 | 12/05 |
| 20 | 3/14 | 2/16 | 2/28 | 3/26 | 4/07 | 11/17 | 10/20 | 10/23 | 12/10 | 12/22 |
| 16 | 3/07 | 1/15 | 2/08 | 3/23 | 3/26 | 12/03 | 11/02 | 11/10 | 12/19 | 12/22 |
Length of Growing Season (Days)
Derived from 1971-2000 Averages
| Temp °F | Median | Shortest | 10% | 90% | Longest |
|---|---|---|---|---|---|
| 32 | 174 | 149 | 158 | 196 | 204 |
| 30 | 187 | 149 | 165 | 210 | 228 |
| 28 | 201 | 156 | 178 | 218 | 228 |
| 24 | 226 | 191 | 200 | 260 | 264 |
| 20 | 250 | 220 | 225 | 273 | 284 |
| 16 | 273 | 237 | 246 | 308 | 340 |
Copyright 2007 Illinois State Water Survey
Last Modified: September 11, 2007