Precipitation Summary
Station: 117636 SALEM, IL
1971-2000 NCDC Normals
Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Prec. (in) | 2.46 | 2.53 | 3.98 | 4.01 | 4.37 | 4.15 | 3.90 | 3.43 | 3.22 | 3.10 | 4.12 | 3.26 | 42.53 |
Precipitation Extremes
Period of Record: 1915-2006
Month | High (in) | Year | Low (in) | Year | 1-Day Max (in) |
Date |
---|---|---|---|---|---|---|
Jan | 9.43 | 1949 | 0.13 | 1986 | 2.76 | 01-30-1916 |
Feb | 6.14 | 1950 | 0.01 | 1947 | 2.54 | 02-13-1946 |
Mar | 10.91 | 1945 | 0.48 | 1917 | 2.75 | 03-09-1964 |
Apr | 11.05 | 1994 | 1.02 | 1976 | 3.42 | 04-21-1984 |
May | 15.07 | 1995 | 0.99 | 2005 | 4.55 | 05-08-1961 |
Jun | 10.66 | 1970 | 0.22 | 1933 | 4.40 | 06-15-1957 |
Jul | 10.63 | 1942 | 0.23 | 1930 | 4.42 | 07-09-1942 |
Aug | 10.23 | 1920 | 0.24 | 1955 | 4.90 | 08-04-1998 |
Sep | 9.81 | 1984 | 0.30 | 1963 | 3.19 | 09-01-1959 |
Oct | 14.08 | 1919 | 0.15 | 1944 | 4.26 | 10-26-1919 |
Nov | 11.90 | 1985 | 0.26 | 1976 | 4.85 | 11-14-1993 |
Dec | 10.57 | 1967 | 0.42 | 1955 | 4.27 | 12-21-1967 |
Annual | 61.14 | 1957 | 27.54 | 1947 | 4.90 | 08-04-1998 |
Winter | 18.70 | 1950 | 2.99 | 1931 | 4.27 | 12-21-1967 |
Spring | 22.68 | 1945 | 5.11 | 1936 | 4.55 | 05-08-1961 |
Summer | 23.47 | 1942 | 4.03 | 1933 | 4.90 | 08-04-1998 |
Fall | 20.80 | 1984 | 3.04 | 1999 | 4.85 | 11-14-1993 |
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 | 9.3 | 5.1 | 1.6 | 0.5 |
Feb | 7.9 | 4.9 | 1.8 | 0.5 |
Mar | 10.5 | 7.4 | 2.9 | 1.1 |
Apr | 10.8 | 7.6 | 2.7 | 0.9 |
May | 11.3 | 7.9 | 2.9 | 1.0 |
Jun | 9.7 | 7.0 | 2.8 | 1.1 |
Jul | 8.3 | 5.6 | 2.8 | 1.2 |
Aug | 8.4 | 5.9 | 2.3 | 0.8 |
Sep | 7.3 | 5.0 | 2.2 | 1.0 |
Oct | 8.7 | 5.3 | 2.3 | 0.8 |
Nov | 9.9 | 6.8 | 3.0 | 1.1 |
Dec | 9.5 | 6.2 | 2.2 | 0.7 |
Annual | 111.6 | 74.8 | 29.5 | 10.6 |
Winter | 26.7 | 16.2 | 5.6 | 1.6 |
Spring | 32.6 | 22.8 | 8.5 | 3.0 |
Summer | 26.4 | 18.6 | 7.9 | 3.1 |
Fall | 25.9 | 17.2 | 7.5 | 2.9 |
Temperature Summary
Station 117636 SALEM, IL
1971-2000 NCDC Normals
Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
High °F | 36.8 | 42.7 | 54.1 | 65.4 | 75.3 | 84.2 | 88.2 | 86.6 | 79.6 | 68.6 | 53.7 | 41.6 | 64.7 |
Low °F | 18.1 | 22.3 | 32.5 | 43.6 | 53.7 | 63.2 | 68.1 | 66.0 | 57.2 | 45.1 | 33.9 | 23.9 | 44.0 |
Mean °F | 27.5 | 32.5 | 43.3 | 54.5 | 64.5 | 73.7 | 78.2 | 76.3 | 68.4 | 56.9 | 43.8 | 32.8 | 54.4 |
HDD | 1166 | 910 | 674 | 326 | 122 | 7 | 0 | 3 | 46 | 279 | 636 | 1000 | 5169 |
CDD | 0 | 0 | 0 | 11 | 108 | 269 | 408 | 353 | 146 | 25 | 0 | 0 | 1320 |
HDD – heating degree days (base 65F); CDD – cooling degree days (base 65F)
Temperature Extremes
Period of Record: 1958-2006
Month | High Mean °F |
Year | Low Mean °F |
Year | 1-Day Max °F |
Date | 1-Day Min °F |
Date |
---|---|---|---|---|---|---|---|---|
Jan | 40.9 | 1990 | 14.4 | 1977 | 70 | 01-23-1967 | -23 | 01-19-1994 |
Feb | 43.9 | 1976 | 21.5 | 1978 | 78 | 02-13-1962 | -23 | 02-10-1982 |
Mar | 51.3 | 1973 | 29.0 | 1960 | 85 | 03-30-1986 | -8 | 03-05-1978 |
Apr | 62.6 | 1981 | 49.7 | 1983 | 91 | 04-29-1987 | 20 | 04-07-1990 |
May | 73.1 | 1962 | 60.5 | 1961 | 94 | 05-20-1987 | 31 | 05-01-1960 |
Jun | 78.2 | 1984 | 68.9 | 2003 | 101 | 06-24-1988 | 38 | 06-03-1969 |
Jul | 82.0 | 1980 | 73.7 | 1971 | 104 | 07-15-1980 | 48 | 07-27-1962 |
Aug | 82.7 | 1983 | 70.4 | 1967 | 105 | 08-20-1983 | 44 | 08-13-1964 |
Sep | 73.6 | 1960 | 63.3 | 1974 | 100 | 09-06-1960 | 33 | 09-23-1974 |
Oct | 65.8 | 1963 | 51.0 | 1987 | 93 | 10-11-1963 | 21 | 10-24-1981 |
Nov | 51.7 | 1990 | 36.8 | 1976 | 82 | 11-02-1987 | 2 | 11-17-1959 |
Dec | 41.9 | 1982 | 20.4 | 2000 | 74 | 12-02-1982 | -20 | 12-22-1989 |
Annual | 60.6 | 1958 | 53.3 | 1979 | 105 | 08-20-1983 | -23 | 01-19-1994 |
Winter | 37.7 | 1992 | 24.6 | 1978 | 78 | 02-13-1962 | -23 | 01-19-1994 |
Spring | 60.8 | 1991 | 49.5 | 1960 | 94 | 05-20-1987 | -8 | 03-05-1978 |
Summer | 79.2 | 1983 | 72.5 | 2004 | 105 | 08-20-1983 | 38 | 06-03-1969 |
Fall | 61.5 | 1973 | 51.6 | 1976 | 100 | 09-06-1960 | 2 | 11-17-1959 |
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 | 10.1 | 26.6 | 2.2 |
Feb | 0.0 | 5.6 | 20.3 | 1.2 |
Mar | 0.0 | 0.9 | 13.9 | 0.1 |
Apr | 0.1 | 0.0 | 3.9 | 0.0 |
May | 1.3 | 0.0 | 0.1 | 0.0 |
Jun | 8.1 | 0.0 | 0.0 | 0.0 |
Jul | 14.8 | 0.0 | 0.0 | 0.0 |
Aug | 10.8 | 0.0 | 0.0 | 0.0 |
Sep | 3.7 | 0.0 | 0.0 | 0.0 |
Oct | 0.0 | 0.0 | 2.9 | 0.0 |
Nov | 0.0 | 0.4 | 12.4 | 0.0 |
Dec | 0.0 | 5.4 | 22.7 | 1.1 |
Annual | 38.7 | 22.4 | 102.9 | 4.6 |
Winter | 0.0 | 21.1 | 69.6 | 4.5 |
Spring | 1.3 | 0.9 | 17.9 | 0.1 |
Summer | 33.6 | 0.0 | 0.0 | 0.0 |
Fall | 3.8 | 0.4 | 15.4 | 0.0 |
Snowfall Summary
Station: 117636 SALEM, IL
1971-2000 Averages
Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Snow (in) | 5.3 | 3.3 | 1.5 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.6 | 3.3 | 14.4 |
Snowfall Extremes
Period of Record: 1915-2006
Month | High (in) | Year | 1-Day Max (in) | Date |
---|---|---|---|---|
Jan | 17.4 | 1977 | 13.5 | 01-31-1982 |
Feb | 16.0 | 1984 | 10.0 | 02-27-1984 |
Mar | 16.0 | 1960 | 10.5 | 03-12-2000 |
Apr | 6.3 | 1971 | 6.3 | 04-06-1971 |
May | 0.0 | – | – | – |
Jun | 0.0 | – | – | – |
Jul | 0.0 | – | – | – |
Aug | 0.0 | – | – | – |
Sep | 0.0 | – | – | – |
Oct | 2.5 | 1993 | 2.5 | 10-31-1993 |
Nov | 5.5 | 1958 | 5.5 | 11-28-1958 |
Dec | 16.7 | 2000 | 11.0 | 12-06-1950 |
Season (Jul-Jun) | 28.7 | 2002-2003 | 13.5 | 01-31-1982 |
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 | 2.0 | 1.1 | 0.8 | 0.1 |
Feb | 2.0 | 1.1 | 0.8 | 0.1 |
Mar | 0.8 | 0.4 | 0.3 | 0.1 |
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 | 0.0 | 0.0 | 0.0 | 0.0 |
Nov | 0.4 | 0.2 | 0.2 | 0.0 |
Dec | 2.1 | 1.3 | 0.6 | 0.2 |
Annual | 8.8 | 5.1 | 2.9 | 0.6 |
Growing Season Summary
Station: 117636 SALEM, 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 | 31 | 72 | 225 | 475 | 785 | 1028 | 1184 | 1122 | 867 | 546 | 218 | 60 | 6618 |
45 | 12 | 34 | 136 | 338 | 630 | 878 | 1029 | 967 | 717 | 398 | 131 | 28 | 5304 |
50 | 4 | 13 | 74 | 219 | 476 | 728 | 874 | 812 | 567 | 264 | 70 | 12 | 4118 |
55 | 1 | 4 | 34 | 125 | 329 | 578 | 719 | 657 | 421 | 155 | 31 | 4 | 3063 |
60 | 0 | 1 | 13 | 62 | 200 | 429 | 564 | 502 | 285 | 76 | 10 | 0 | 2146 |
50** | 18 | 45 | 138 | 289 | 500 | 697 | 811 | 766 | 569 | 340 | 124 | 32 | 4335 |
**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 | 4/12 | 3/24 | 3/29 | 4/24 | 5/05 | 10/20 | 10/02 | 10/06 | 11/05 | 11/10 |
30 | 4/10 | 3/18 | 3/26 | 4/21 | 4/29 | 10/25 | 10/03 | 10/10 | 11/09 | 11/23 |
28 | 4/06 | 3/07 | 3/16 | 4/14 | 4/20 | 11/03 | 10/03 | 10/14 | 11/22 | 11/28 |
24 | 3/20 | 2/28 | 3/09 | 4/10 | 4/18 | 11/13 | 10/20 | 10/28 | 12/05 | 12/11 |
20 | 3/10 | 2/09 | 2/21 | 3/25 | 4/07 | 11/25 | 11/02 | 11/08 | 12/14 | 12/22 |
16 | 2/26 | 1/15 | 2/07 | 3/16 | 3/25 | 12/08 | 11/03 | 11/11 | 12/22 | 12/25 |
Length of Growing Season (Days)
Derived from 1971-2000 Averages
Temp °F | Median | Shortest | 10% | 90% | Longest |
---|---|---|---|---|---|
32 | 190 | 167 | 170 | 212 | 226 |
30 | 199 | 174 | 177 | 226 | 235 |
28 | 212 | 177 | 189 | 242 | 252 |
24 | 235 | 199 | 217 | 256 | 271 |
20 | 259 | 228 | 237 | 287 | 289 |
16 | 284 | 237 | 260 | 305 | 340 |
Copyright 2007 Illinois State Water Survey
Last Modified: September 11, 2007