Precipitation Summary
Station: 118179 SPRINGFIELD CAPITAL AIRPORT, IL
1971-2000 NCDC Normals
| Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Prec. (in) | 1.62 | 1.80 | 3.15 | 3.36 | 4.06 | 3.77 | 3.53 | 3.41 | 2.83 | 2.62 | 2.87 | 2.54 | 35.56 |
Precipitation Extremes
Period of Record: 1908-2006
| Month | High (in) | Year | Low (in) | Year | 1-Day Max (in) |
Date |
|---|---|---|---|---|---|---|
| Jan | 5.67 | 1949 | 0.04 | 1986 | 2.12 | 01-10-1975 |
| Feb | 4.89 | 1990 | 0.44 | 1941 | 2.37 | 02-22-1990 |
| Mar | 7.89 | 1973 | 0.63 | 1937 | 2.63 | 03-23-1936 |
| Apr | 9.91 | 1964 | 0.73 | 1971 | 4.45 | 04-11-1979 |
| May | 11.05 | 1943 | 0.52 | 1992 | 3.54 | 05-08-1996 |
| Jun | 9.22 | 1990 | 0.23 | 1959 | 4.48 | 06-10-1958 |
| Jul | 10.76 | 1981 | 0.89 | 1997 | 4.33 | 07-27-1981 |
| Aug | 8.37 | 1981 | 0.07 | 1943 | 4.40 | 08-02-1981 |
| Sep | 8.57 | 1986 | 0.00 | 1979 | 5.12 | 09-26-1959 |
| Oct | 13.92 | 1941 | 0.16 | 1964 | 4.76 | 10-04-1941 |
| Nov | 6.94 | 1985 | 0.25 | 1999 | 2.36 | 11-15-1964 |
| Dec | 8.94 | 1982 | 0.15 | 1955 | 4.70 | 12-02-1982 |
| Annual | 52.67 | 1990 | 21.95 | 1940 | 5.12 | 09-26-1959 |
| Winter | 12.21 | 1950 | 1.83 | 1963 | 4.70 | 12-02-1982 |
| Spring | 17.68 | 1944 | 5.23 | 1987 | 4.45 | 04-11-1979 |
| Summer | 24.93 | 1981 | 3.42 | 1936 | 4.48 | 06-10-1958 |
| Fall | 22.68 | 1941 | 3.32 | 1963 | 5.12 | 09-26-1959 |
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 | 9.1 | 4.3 | 0.8 | 0.2 |
| Feb | 8.5 | 4.0 | 1.0 | 0.3 |
| Mar | 11.4 | 6.7 | 2.1 | 0.8 |
| Apr | 11.4 | 6.8 | 2.1 | 0.7 |
| May | 11.0 | 7.0 | 2.7 | 1.0 |
| Jun | 9.6 | 6.3 | 2.2 | 0.9 |
| Jul | 8.6 | 5.5 | 2.2 | 1.0 |
| Aug | 8.3 | 5.2 | 2.3 | 0.9 |
| Sep | 8.0 | 5.1 | 1.8 | 0.8 |
| Oct | 8.3 | 5.1 | 1.8 | 0.6 |
| Nov | 9.8 | 6.0 | 1.9 | 0.5 |
| Dec | 9.9 | 5.3 | 1.5 | 0.6 |
| Annual | 113.9 | 67.2 | 22.5 | 8.1 |
| Winter | 27.5 | 13.6 | 3.3 | 1.1 |
| Spring | 33.7 | 20.4 | 6.9 | 2.4 |
| Summer | 26.6 | 17.0 | 6.7 | 2.8 |
| Fall | 26.1 | 16.3 | 5.5 | 1.8 |
Temperature Summary
Station 118179 SPRINGFIELD CAPITAL AP, IL
1971-2000 NCDC Normals
| Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 33.1 | 38.9 | 51.1 | 63.4 | 74.4 | 83.3 | 86.5 | 84.5 | 78.5 | 66.6 | 50.9 | 38.0 | 62.4 |
| Low °F | 17.1 | 22.2 | 32.4 | 42.2 | 52.7 | 61.9 | 66.0 | 63.9 | 55.4 | 44.4 | 33.7 | 22.6 | 42.9 |
| Mean °F | 25.1 | 30.6 | 41.8 | 52.8 | 63.6 | 72.6 | 76.3 | 74.2 | 67.0 | 55.5 | 42.3 | 30.3 | 52.7 |
| HDD | 1239 | 979 | 726 | 376 | 126 | 14 | 1 | 4 | 77 | 319 | 674 | 1061 | 5596 |
| CDD | 0 | 0 | 2 | 17 | 84 | 249 | 358 | 291 | 140 | 23 | 1 | 0 | 1165 |
HDD – heating degree days (base 65F); CDD – cooling degree days (base 65F)
Temperature Extremes
Period of Record: 1879-2006
| 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 | 71 | 01-24-1950 | -21 | 01-17-1977 |
| Feb | 40.4 | 1998 | 16.7 | 1978 | 74 | 02-29-1972 | -22 | 02-26-1963 |
| Mar | 48.3 | 1973 | 24.2 | 1960 | 87 | 03-31-1981 | -12 | 03-05-1960 |
| Apr | 60.4 | 1981 | 46.2 | 1950 | 90 | 04-25-1986 | 19 | 04-06-1982 |
| May | 72.3 | 1962 | 57.7 | 1966 | 95 | 05-17-1962 | 28 | 05-10-1966 |
| Jun | 79.0 | 1971 | 68.1 | 1958 | 103 | 06-26-1954 | 39 | 06-01-2003 |
| Jul | 81.4 | 1980 | 72.1 | 1996 | 112 | 07-14-1954 | 48 | 07-14-1967 |
| Aug | 80.2 | 1995 | 68.6 | 1967 | 103 | 08-03-1964 | 43 | 08-13-1964 |
| Sep | 72.7 | 1960 | 61.0 | 1949 | 101 | 09-01-1984 | 32 | 09-30-1984 |
| Oct | 66.4 | 1963 | 49.4 | 1976 | 93 | 10-02-1953 | 17 | 10-29-1952 |
| Nov | 49.9 | 2001 | 34.6 | 1950 | 83 | 11-01-1950 | -3 | 11-30-1964 |
| Dec | 38.8 | 1982 | 16.1 | 1983 | 74 | 12-03-1970 | -21 | 12-23-1989 |
| Annual | 55.4 | 1998 | 50.7 | 1950 | 112 | 07-14-1954 | -22 | 02-26-1963 |
| Winter | 35.0 | 1998 | 19.9 | 1978 | 74 | 12-03-1970 | -22 | 02-26-1963 |
| Spring | 59.5 | 1977 | 46.6 | 1960 | 95 | 05-17-1962 | -12 | 03-05-1960 |
| Summer | 78.1 | 1983 | 70.4 | 2004 | 112 | 07-14-1954 | 39 | 06-01-1903 |
| Fall | 59.5 | 1963 | 49.7 | 1976 | 101 | 09-01-1984 | -3 | 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 | 14.2 | 27.6 | 4.1 |
| Feb | 0.0 | 8.5 | 21.9 | 2.5 |
| Mar | 0.0 | 2.1 | 15.9 | 0.1 |
| Apr | 0.0 | 0.0 | 4.3 | 0.0 |
| May | 1.4 | 0.0 | 0.0 | 0.0 |
| Jun | 6.7 | 0.0 | 0.0 | 0.0 |
| Jul | 10.7 | 0.0 | 0.0 | 0.0 |
| Aug | 6.9 | 0.0 | 0.0 | 0.0 |
| Sep | 3.2 | 0.0 | 0.1 | 0.0 |
| Oct | 0.1 | 0.0 | 3.7 | 0.0 |
| Nov | 0.0 | 1.3 | 14.4 | 0.0 |
| Dec | 0.0 | 8.4 | 24.8 | 1.8 |
| Annual | 29.0 | 34.7 | 113.1 | 8.6 |
| Winter | 0.0 | 31.1 | 74.4 | 8.4 |
| Spring | 1.5 | 2.2 | 20.2 | 0.1 |
| Summer | 24.2 | 0.0 | 0.0 | 0.0 |
| Fall | 3.2 | 1.3 | 18.4 | 0.0 |
Snowfall Summary
Station: 118179 SPRINGFIELD CAPITAL AP, IL
1971-2000 Averages
| Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snow (in) | 7.4 | 5.8 | 3.5 | 0.7 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.6 | 6.0 | 25.0 |
Snowfall Extremes
Period of Record: 1908-2006
| Month | High (in) | Year | 1-Day Max (in) | Date |
|---|---|---|---|---|
| Jan | 21.1 | 1977 | 8.0 | 01-09-1987 |
| Feb | 16.0 | 1993 | 8.2 | 02-24-1965 |
| Mar | 20.3 | 1960 | 8.2 | 03-07-1978 |
| Apr | 7.3 | 1980 | 6.1 | 04-14-1980 |
| May | 0.0 | – | – | – |
| Jun | 0.0 | – | – | – |
| Jul | 0.0 | – | – | – |
| Aug | 0.0 | – | – | – |
| Sep | 0.0 | – | – | – |
| Oct | 0.3 | 1989 | 0.3 | 10-19-1989 |
| Nov | 9.2 | 1951 | 7.8 | 11-06-1951 |
| Dec | 22.7 | 1973 | 17.0 | 12-12-1972 |
| Season (Jul-Jun) | 52.1 | 1977-1978 | 17.0 | 12-12-1972 |
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 | 4.4 | 1.6 | 1.0 | 0.3 |
| Feb | 4.4 | 1.6 | 1.0 | 0.3 |
| Mar | 2.5 | 0.9 | 0.5 | 0.2 |
| Apr | 0.7 | 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 | 0.1 | 0.0 | 0.0 | 0.0 |
| Nov | 1.6 | 0.5 | 0.2 | 0.1 |
| Dec | 4.7 | 1.6 | 0.8 | 0.3 |
| Annual | 19.8 | 7.1 | 4.0 | 1.2 |
Growing Season Summary
Station: 118179 SPRINGFIELD CAPITAL AP, 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 | 15 | 43 | 170 | 406 | 742 | 989 | 1136 | 1071 | 818 | 492 | 170 | 37 | 6067 |
| 45 | 5 | 18 | 97 | 277 | 587 | 839 | 981 | 916 | 668 | 350 | 98 | 15 | 4833 |
| 50 | 1 | 6 | 51 | 170 | 435 | 689 | 826 | 761 | 519 | 227 | 51 | 6 | 3730 |
| 55 | 0 | 1 | 25 | 92 | 294 | 539 | 671 | 606 | 376 | 132 | 23 | 2 | 2753 |
| 60 | 0 | 0 | 9 | 44 | 175 | 391 | 516 | 451 | 247 | 65 | 7 | 0 | 1902 |
| 50** | 8 | 26 | 102 | 239 | 463 | 665 | 782 | 732 | 531 | 298 | 93 | 19 | 3947 |
**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 | 4/01 | 4/25 | 5/04 | 10/12 | 9/22 | 10/04 | 10/26 | 11/03 |
| 30 | 4/08 | 3/23 | 3/28 | 4/21 | 5/04 | 10/21 | 10/02 | 10/08 | 11/05 | 11/12 |
| 28 | 4/06 | 3/18 | 3/23 | 4/16 | 4/18 | 10/28 | 10/02 | 10/12 | 11/12 | 11/28 |
| 24 | 3/26 | 3/02 | 3/14 | 4/12 | 4/18 | 11/07 | 10/11 | 10/21 | 11/21 | 11/29 |
| 20 | 3/15 | 2/14 | 2/24 | 4/02 | 4/09 | 11/17 | 10/20 | 11/04 | 12/10 | 12/21 |
| 16 | 3/07 | 2/07 | 2/09 | 3/15 | 3/25 | 12/03 | 11/02 | 11/08 | 12/19 | 12/30 |
Length of Growing Season (Days)
Derived from 1971-2000 Averages
| Temp °F | Median | Shortest | 10% | 90% | Longest |
|---|---|---|---|---|---|
| 32 | 181 | 166 | 171 | 201 | 210 |
| 30 | 197 | 166 | 177 | 215 | 220 |
| 28 | 205 | 176 | 190 | 227 | 255 |
| 24 | 222 | 191 | 196 | 253 | 259 |
| 20 | 250 | 217 | 221 | 276 | 282 |
| 16 | 269 | 238 | 251 | 301 | 311 |
Copyright 2007 Illinois State Water Survey
Last Modified: September 11, 2007