Precipitation Summary
Station: 112223 DE KALB, IL
1971-2000 NCDC Normals
| Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Prec. (in) | 1.54 | 1.40 | 2.46 | 3.52 | 4.21 | 4.49 | 4.22 | 4.48 | 3.51 | 2.60 | 2.82 | 2.13 | 37.38 |
Precipitation Extremes
Period of Record: 1966-2006
| Month | High (in) | Year | Low (in) | Year | 1-Day Max (in) |
Date |
|---|---|---|---|---|---|---|
| Jan | 4.08 | 1974 | 0.08 | 1981 | 1.47 | 01-13-1979 |
| Feb | 4.90 | 1997 | 0.06 | 1987 | 2.60 | 02-21-1997 |
| Mar | 6.37 | 1976 | 0.32 | 1968 | 1.58 | 03-04-1985 |
| Apr | 6.50 | 1973 | 0.88 | 1989 | 2.08 | 04-06-1988 |
| May | 10.44 | 2004 | 0.86 | 1992 | 2.81 | 05-21-2004 |
| Jun | 9.87 | 1993 | 0.33 | 1988 | 3.06 | 06-02-1970 |
| Jul | 11.40 | 1996 | 0.65 | 2002 | 8.09 | 07-18-1996 |
| Aug | 14.23 | 1987 | 1.11 | 1970 | 5.71 | 08-14-1987 |
| Sep | 11.56 | 1970 | 0.04 | 1979 | 3.47 | 09-28-1999 |
| Oct | 6.75 | 1969 | 0.53 | 2005 | 2.98 | 10-11-1969 |
| Nov | 7.02 | 1985 | 0.34 | 1999 | 2.20 | 11-11-1995 |
| Dec | 4.97 | 1982 | 0.35 | 1976 | 2.03 | 12-10-2003 |
| Annual | 49.64 | 1972 | 22.52 | 1968 | 8.09 | 07-18-1996 |
| Winter | 8.86 | 1974 | 1.42 | 1977 | 2.60 | 02-21-1997 |
| Spring | 16.50 | 2004 | 4.44 | 1994 | 2.81 | 05-21-2004 |
| Summer | 23.17 | 1996 | 4.25 | 1991 | 8.09 | 07-18-1996 |
| Fall | 15.93 | 1970 | 4.13 | 1979 | 3.47 | 09-28-1999 |
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 | 10.0 | 4.4 | 0.6 | 0.2 |
| Feb | 7.7 | 3.4 | 0.8 | 0.1 |
| Mar | 10.6 | 5.9 | 1.4 | 0.4 |
| Apr | 11.8 | 7.3 | 2.3 | 0.8 |
| May | 11.4 | 7.6 | 2.8 | 1.1 |
| Jun | 10.3 | 7.4 | 3.4 | 1.2 |
| Jul | 9.6 | 5.9 | 2.1 | 1.3 |
| Aug | 10.0 | 6.6 | 2.8 | 1.3 |
| Sep | 9.1 | 5.8 | 2.4 | 0.9 |
| Oct | 9.4 | 5.6 | 1.7 | 0.4 |
| Nov | 9.9 | 5.7 | 2.0 | 0.5 |
| Dec | 10.1 | 5.3 | 1.3 | 0.4 |
| Annual | 119.9 | 70.9 | 23.7 | 8.6 |
| Winter | 27.8 | 13.1 | 2.6 | 0.8 |
| Spring | 33.8 | 20.8 | 6.5 | 2.3 |
| Summer | 29.9 | 19.8 | 8.4 | 3.8 |
| Fall | 28.4 | 17.1 | 6.1 | 1.8 |
Temperature Summary
Station 112223 DE KALB, IL
1971-2000 NCDC Normals
| Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 26.7 | 32.3 | 44.5 | 58.1 | 70.4 | 80.3 | 83.6 | 81.3 | 74.3 | 62.5 | 45.4 | 32.3 | 57.6 |
| Low °F | 10.3 | 15.5 | 26.2 | 36.8 | 48.1 | 58.4 | 62.6 | 60.5 | 51.4 | 39.9 | 28.2 | 16.9 | 37.9 |
| Mean °F | 18.5 | 23.9 | 35.4 | 47.5 | 59.3 | 69.4 | 73.1 | 70.9 | 62.9 | 51.2 | 36.8 | 24.6 | 47.8 |
| HDD | 1441 | 1152 | 919 | 528 | 230 | 29 | 5 | 29 | 116 | 432 | 845 | 1253 | 6979 |
| CDD | 0 | 0 | 0 | 2 | 52 | 159 | 256 | 212 | 51 | 4 | 0 | 0 | 736 |
HDD – heating degree days (base 65F); CDD – cooling degree days (base 65F)
Temperature Extremes
Period of Record: 1966-2006
| Month | High Mean °F |
Year | Low Mean °F |
Year | 1-Day Max °F |
Date | 1-Day Min °F |
Date |
|---|---|---|---|---|---|---|---|---|
| Jan | 32.4 | 2006 | 7.6 | 1977 | 63 | 01-24-1967 | -27 | 01-20-1985 |
| Feb | 36.6 | 1998 | 14.7 | 1989 | 69 | 02-26-2000 | -23 | 02-03-1996 |
| Mar | 43.7 | 1973 | 28.9 | 1996 | 84 | 03-30-1986 | -13 | 03-04-2002 |
| Apr | 56.0 | 1977 | 43.8 | 1975 | 92 | 04-26-1986 | 8 | 04-07-1982 |
| May | 68.4 | 1977 | 53.3 | 1997 | 95 | 05-26-1985 | 24 | 05-07-1989 |
| Jun | 74.5 | 2005 | 65.1 | 1982 | 101 | 06-26-1988 | 34 | 06-01-1993 |
| Jul | 78.0 | 1983 | 69.2 | 1992 | 102 | 07-14-1995 | 43 | 07-06-1967 |
| Aug | 78.6 | 1983 | 65.3 | 1992 | 103 | 08-17-1988 | 39 | 08-28-1986 |
| Sep | 70.3 | 1978 | 60.2 | 1975 | 94 | 09-08-1978 | 27 | 09-27-1991 |
| Oct | 58.8 | 1971 | 44.4 | 1987 | 89 | 10-02-1976 | 13 | 10-30-1988 |
| Nov | 47.1 | 2001 | 29.5 | 1995 | 76 | 11-09-1999 | -8 | 11-29-1976 |
| Dec | 35.3 | 1982 | 12.6 | 2000 | 66 | 12-03-1970 | -22 | 12-24-1983 |
| Annual | 53.6 | 1966 | 45.8 | 1996 | 103 | 08-17-1988 | -27 | 01-20-1985 |
| Winter | 31.1 | 1983 | 15.8 | 1979 | 69 | 02-26-1900 | -27 | 01-20-1985 |
| Spring | 55.6 | 1977 | 43.1 | 1996 | 95 | 05-26-1985 | -13 | 03-04-1902 |
| Summer | 76.1 | 1983 | 67.1 | 1992 | 103 | 08-17-1988 | 34 | 06-01-1993 |
| Fall | 54.9 | 1971 | 46.8 | 1976 | 94 | 09-08-1978 | -8 | 11-29-1976 |
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 | 20.6 | 30.1 | 7.6 |
| Feb | 0.0 | 13.0 | 25.4 | 3.9 |
| Mar | 0.0 | 4.3 | 22.6 | 0.2 |
| Apr | 0.1 | 0.2 | 8.9 | 0.0 |
| May | 0.7 | 0.0 | 1.0 | 0.0 |
| Jun | 3.8 | 0.0 | 0.0 | 0.0 |
| Jul | 5.6 | 0.0 | 0.0 | 0.0 |
| Aug | 3.8 | 0.0 | 0.0 | 0.0 |
| Sep | 1.4 | 0.0 | 0.5 | 0.0 |
| Oct | 0.0 | 0.0 | 6.3 | 0.0 |
| Nov | 0.0 | 3.2 | 18.7 | 0.1 |
| Dec | 0.0 | 13.0 | 28.5 | 3.4 |
| Annual | 15.4 | 53.7 | 142.2 | 14.9 |
| Winter | 0.0 | 46.4 | 83.9 | 14.7 |
| Spring | 0.8 | 4.5 | 32.8 | 0.2 |
| Summer | 13.3 | 0.0 | 0.0 | 0.0 |
| Fall | 1.3 | 3.3 | 26.0 | 0.1 |
Snowfall Summary
Station: 112223 DE KALB, IL
1971-2000 Averages
| Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snow (in) | 9.9 | 7.4 | 4.8 | 1.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 2.1 | 9.5 | 35.0 |
Snowfall Extremes
Period of Record: 1966-2006
| Month | High (in) | Year | 1-Day Max (in) | Date |
|---|---|---|---|---|
| Jan | 29.6 | 1979 | 15.6 | 01-13-1979 |
| Feb | 26.4 | 1994 | 8.0 | 02-19-2000 |
| Mar | 23.5 | 1972 | 8.0 | 03-29-1972 |
| Apr | 8.8 | 1975 | 5.9 | 04-02-1975 |
| May | 2.5 | 1966 | 2.5 | 05-11-1966 |
| Jun | 0.0 | – | – | – |
| Jul | 0.0 | – | – | – |
| Aug | 0.0 | – | – | – |
| Sep | 0.0 | – | – | – |
| Oct | 3.5 | 1967 | 3.5 | 10-27-1967 |
| Nov | 6.8 | 1997 | 4.0 | 11-27-1975 |
| Dec | 34.5 | 1978 | 10.6 | 12-15-1987 |
| Season (Jul-Jun) | 80.3 | 1978-1979 | 15.6 | 01-13-1979 |
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 | 4.7 | 2.6 | 1.5 | 0.2 |
| Feb | 4.7 | 2.6 | 1.5 | 0.2 |
| Mar | 3.1 | 1.5 | 1.0 | 0.2 |
| Apr | 0.6 | 0.4 | 0.2 | 0.1 |
| 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 | 0.1 | 0.0 | 0.0 |
| Nov | 2.2 | 0.8 | 0.4 | 0.0 |
| Dec | 6.0 | 2.9 | 1.8 | 0.4 |
| Annual | 24.2 | 11.9 | 6.3 | 1.2 |
Growing Season Summary
Station: 112223 DE KALB, 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 | 2 | 12 | 87 | 287 | 626 | 901 | 1045 | 974 | 728 | 388 | 97 | 14 | 5032 |
| 45 | 0 | 2 | 46 | 177 | 474 | 751 | 890 | 820 | 579 | 258 | 48 | 6 | 3947 |
| 50 | 0 | 0 | 22 | 98 | 329 | 601 | 735 | 666 | 433 | 153 | 21 | 2 | 2981 |
| 55 | 0 | 0 | 9 | 48 | 205 | 453 | 580 | 512 | 295 | 78 | 7 | 0 | 2130 |
| 60 | 0 | 0 | 2 | 22 | 113 | 310 | 425 | 359 | 180 | 31 | 1 | 0 | 1406 |
| 50** | 1 | 7 | 54 | 175 | 383 | 594 | 711 | 652 | 461 | 232 | 51 | 6 | 3245 |
**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 | 4/28 | 3/28 | 4/12 | 5/12 | 5/27 | 10/08 | 9/19 | 9/23 | 10/22 | 11/01 |
| 30 | 4/22 | 3/25 | 4/08 | 5/12 | 5/27 | 10/13 | 9/19 | 9/24 | 11/04 | 11/08 |
| 28 | 4/13 | 3/24 | 4/04 | 4/30 | 5/11 | 10/21 | 9/26 | 10/03 | 11/10 | 11/20 |
| 24 | 4/07 | 3/14 | 3/24 | 4/21 | 5/07 | 11/03 | 10/07 | 10/19 | 11/18 | 11/22 |
| 20 | 3/23 | 2/27 | 3/14 | 4/09 | 4/13 | 11/11 | 10/20 | 10/27 | 11/27 | 11/29 |
| 16 | 3/17 | 2/17 | 2/24 | 4/04 | 4/09 | 11/22 | 10/31 | 11/05 | 12/10 | 12/22 |
Length of Growing Season (Days)
Derived from 1971-2000 Averages
| Temp °F | Median | Shortest | 10% | 90% | Longest |
|---|---|---|---|---|---|
| 32 | 164 | 125 | 138 | 183 | 204 |
| 30 | 175 | 125 | 142 | 208 | 213 |
| 28 | 193 | 146 | 162 | 219 | 225 |
| 24 | 213 | 174 | 186 | 232 | 240 |
| 20 | 229 | 194 | 209 | 256 | 265 |
| 16 | 253 | 222 | 229 | 280 | 284 |
Copyright 2007 Illinois State Water Survey
Last Modified: September 11, 2007