Precipitation Summary
Station: 110993 BROOKPORT DAM 52, IL
1971-2000 NCDC Normals
Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Prec. (in) | 3.51 | 3.91 | 4.42 | 4.70 | 4.76 | 4.03 | 4.28 | 3.00 | 3.27 | 3.23 | 4.45 | 4.37 | 47.93 |
Precipitation Extremes
Period of Record: 1928-2006
Month | High (in) | Year | Low (in) | Year | 1-Day Max (in) |
Date |
---|---|---|---|---|---|---|
Jan | 19.03 | 1937 | 0.22 | 1943 | 5.22 | 01-25-1949 |
Feb | 13.21 | 1989 | 0.36 | 1947 | 5.32 | 02-14-1989 |
Mar | 10.89 | 1935 | 0.55 | 1941 | 4.64 | 03-31-1938 |
Apr | 11.75 | 1983 | 1.20 | 1959 | 5.20 | 04-30-1983 |
May | 9.86 | 1983 | 1.05 | 1932 | 4.46 | 05-11-1943 |
Jun | 12.68 | 1935 | 0.17 | 1952 | 4.23 | 06-08-1979 |
Jul | 12.01 | 1958 | 0.39 | 1970 | 3.76 | 07-16-1958 |
Aug | 9.67 | 1942 | 0.47 | 1936 | 4.57 | 08-23-1942 |
Sep | 9.76 | 1932 | 0.04 | 1998 | 4.35 | 09-20-1932 |
Oct | 7.59 | 1985 | 0.01 | 1964 | 3.50 | 10-07-1998 |
Nov | 12.07 | 1957 | 0.75 | 1949 | 4.45 | 11-22-1934 |
Dec | 10.09 | 1982 | 0.36 | 1958 | 3.50 | 12-17-2001 |
Annual | 68.80 | 2006 | 29.11 | 1963 | 5.32 | 02-14-1989 |
Winter | 27.92 | 1950 | 3.79 | 1943 | 5.32 | 02-14-1989 |
Spring | 27.79 | 1973 | 5.46 | 1930 | 5.20 | 04-30-1983 |
Summer | 25.00 | 1958 | 4.14 | 1930 | 4.57 | 08-23-1942 |
Fall | 20.52 | 2006 | 3.73 | 1963 | 4.45 | 11-22-1934 |
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 | 9.5 | 6.1 | 2.4 | 1.0 |
Feb | 9.0 | 6.2 | 2.5 | 1.1 |
Mar | 11.6 | 8.0 | 2.7 | 1.2 |
Apr | 10.7 | 7.3 | 3.3 | 1.3 |
May | 10.9 | 7.8 | 3.2 | 1.3 |
Jun | 9.5 | 6.6 | 2.9 | 1.1 |
Jul | 8.2 | 5.6 | 2.9 | 1.6 |
Aug | 7.0 | 5.0 | 2.1 | 0.6 |
Sep | 7.4 | 5.2 | 2.4 | 1.1 |
Oct | 7.7 | 5.3 | 2.3 | 0.8 |
Nov | 9.6 | 6.7 | 3.4 | 1.4 |
Dec | 10.2 | 7.1 | 3.5 | 1.2 |
Annual | 111.4 | 76.8 | 33.4 | 13.7 |
Winter | 28.7 | 19.3 | 8.3 | 3.3 |
Spring | 33.2 | 23.1 | 9.2 | 3.8 |
Summer | 24.7 | 17.2 | 7.8 | 3.3 |
Fall | 24.6 | 17.1 | 8.0 | 3.3 |
Temperature Summary
Station 110993 BROOKPORT DAM 52, IL
1971-2000 NCDC Normals
Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
High °F | 42.3 | 48.3 | 58.4 | 68.8 | 77.5 | 85.9 | 89.5 | 88.4 | 81.7 | 71.1 | 57.7 | 46.5 | 68.0 |
Low °F | 25.0 | 29.0 | 37.6 | 46.6 | 55.9 | 64.2 | 68.4 | 66.1 | 58.7 | 46.9 | 38.0 | 28.9 | 47.1 |
Mean °F | 33.7 | 38.7 | 48.0 | 57.7 | 66.7 | 75.1 | 79.0 | 77.3 | 70.2 | 59.0 | 47.9 | 37.7 | 57.6 |
HDD | 971 | 737 | 529 | 238 | 79 | 2 | 0 | 1 | 37 | 227 | 515 | 847 | 4183 |
CDD | 0 | 0 | 1 | 19 | 132 | 304 | 432 | 381 | 192 | 39 | 1 | 0 | 1501 |
HDD – heating degree days (base 65F); CDD – cooling degree days (base 65F)
Temperature Extremes
Period of Record: 1962-2006
Month | High Mean °F |
Year | Low Mean °F |
Year | 1-Day Max °F |
Date | 1-Day Min °F |
Date |
---|---|---|---|---|---|---|---|---|
Jan | 45.0 | 2006 | 20.5 | 1977 | 73 | 01-23-1967 | -21 | 01-21-1984 |
Feb | 46.8 | 1976 | 24.1 | 1978 | 74 | 02-25-1981 | -9 | 02-03-1985 |
Mar | 55.0 | 1976 | 40.2 | 1965 | 83 | 03-30-1986 | 0 | 03-05-1978 |
Apr | 63.5 | 1981 | 51.0 | 1983 | 89 | 04-13-1967 | 21 | 04-10-1982 |
May | 74.7 | 1962 | 62.8 | 1981 | 94 | 05-18-1962 | 32 | 05-04-1976 |
Jun | 79.2 | 1971 | 71.0 | 1974 | 100 | 06-26-1971 | 42 | 06-01-1972 |
Jul | 82.7 | 1980 | 74.6 | 1967 | 105 | 07-14-1966 | 48 | 07-06-1972 |
Aug | 81.8 | 1980 | 72.1 | 1967 | 103 | 08-15-1965 | 42 | 08-29-1986 |
Sep | 76.6 | 1998 | 63.4 | 1994 | 99 | 09-09-1980 | 29 | 09-22-1983 |
Oct | 65.9 | 1971 | 53.5 | 1988 | 92 | 10-03-1969 | 18 | 10-24-1981 |
Nov | 54.6 | 1999 | 40.1 | 1976 | 85 | 11-01-2000 | 9 | 11-22-1964 |
Dec | 45.9 | 1971 | 25.8 | 1983 | 74 | 12-02-1982 | -13 | 12-22-1989 |
Annual | 61.0 | 1962 | 54.4 | 1978 | 105 | 07-14-1966 | -21 | 01-21-1984 |
Winter | 41.9 | 2000 | 28.1 | 1978 | 74 | 12-02-1982 | -21 | 01-21-1984 |
Spring | 62.2 | 1977 | 53.5 | 1984 | 94 | 05-18-1962 | 0 | 03-05-1978 |
Summer | 80.1 | 1980 | 73.9 | 1967 | 105 | 07-14-1966 | 42 | 06-01-1972 |
Fall | 63.6 | 1973 | 54.6 | 1976 | 99 | 09-09-1980 | 9 | 11-22-1964 |
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 | 6.2 | 22.9 | 1.1 |
Feb | 0.0 | 3.1 | 16.9 | 0.5 |
Mar | 0.0 | 0.3 | 11.0 | 0.0 |
Apr | 0.0 | 0.0 | 2.5 | 0.0 |
May | 1.2 | 0.0 | 0.0 | 0.0 |
Jun | 8.2 | 0.0 | 0.0 | 0.0 |
Jul | 16.4 | 0.0 | 0.0 | 0.0 |
Aug | 13.2 | 0.0 | 0.0 | 0.0 |
Sep | 4.6 | 0.0 | 0.1 | 0.0 |
Oct | 0.1 | 0.0 | 2.2 | 0.0 |
Nov | 0.0 | 0.1 | 9.5 | 0.0 |
Dec | 0.0 | 3.3 | 19.3 | 0.4 |
Annual | 43.7 | 13.0 | 84.2 | 2.0 |
Winter | 0.0 | 12.5 | 58.9 | 2.0 |
Spring | 1.2 | 0.3 | 13.6 | 0.0 |
Summer | 37.9 | 0.0 | 0.0 | 0.0 |
Fall | 4.7 | 0.1 | 11.7 | 0.0 |
Snowfall Summary
Station: 110993 BROOKPORT DAM 52, IL
1971-2000 Averages
Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Snow (in) | 3.4 | 2.8 | 0.9 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.2 | 8.3 |
Snowfall Extremes
Period of Record: 1928-2006
Month | High (in) | Year | 1-Day Max (in) | Date |
---|---|---|---|---|
Jan | 19.6 | 1978 | 8.0 | 01-17-1978 |
Feb | 13.0 | 1993 | 6.0 | 02-25-1965 |
Mar | 15.5 | 1960 | 10.0 | 03-09-1994 |
Apr | 0.0 | – | – | – |
May | 0.0 | – | – | – |
Jun | 0.0 | – | – | – |
Jul | 0.0 | – | – | – |
Aug | 0.0 | – | – | – |
Sep | 0.0 | – | – | – |
Oct | 0.0 | – | – | – |
Nov | 4.5 | 1950 | 4.5 | 11-24-1950 |
Dec | 13.0 | 2004 | 13.0 | 12-22-2004 |
Season (Jul-Jun) | 35.3 | 1984-1985 | 13.0 | 12-22-2004 |
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 | 1.4 | 1.2 | 0.7 | 0.1 |
Feb | 1.4 | 1.2 | 0.7 | 0.1 |
Mar | 0.4 | 0.3 | 0.2 | 0.0 |
Apr | 0.0 | 0.0 | 0.0 | 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 | 0.0 | 0.0 | 0.0 | 0.0 |
Dec | 0.7 | 0.5 | 0.3 | 0.0 |
Annual | 4.2 | 3.1 | 1.7 | 0.3 |
Growing Season Summary
Station: 110993 BROOKPORT DAM 52, 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 | 63 | 114 | 290 | 538 | 836 | 1054 | 1214 | 1158 | 909 | 598 | 279 | 99 | 7061 |
45 | 27 | 57 | 182 | 394 | 681 | 904 | 1059 | 1003 | 759 | 448 | 175 | 47 | 5663 |
50 | 9 | 23 | 101 | 263 | 526 | 754 | 904 | 849 | 610 | 308 | 97 | 19 | 4408 |
55 | 2 | 6 | 46 | 153 | 374 | 604 | 749 | 695 | 462 | 190 | 46 | 7 | 3293 |
60 | 0 | 0 | 16 | 74 | 234 | 455 | 594 | 540 | 321 | 98 | 16 | 1 | 2322 |
50** | 32 | 64 | 170 | 327 | 541 | 723 | 837 | 796 | 604 | 377 | 160 | 50 | 4621 |
**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 | 4/09 | 3/23 | 3/29 | 4/24 | 5/05 | 10/21 | 9/21 | 10/05 | 11/07 | 11/13 |
30 | 4/06 | 3/18 | 3/19 | 4/16 | 4/23 | 10/23 | 9/21 | 10/13 | 11/13 | 12/03 |
28 | 4/02 | 2/28 | 3/16 | 4/11 | 4/23 | 11/07 | 10/13 | 10/21 | 11/27 | 12/03 |
24 | 3/14 | 2/09 | 3/02 | 4/09 | 4/18 | 11/14 | 10/24 | 10/31 | 12/07 | 12/09 |
20 | 2/27 | 1/30 | 2/08 | 3/16 | 3/24 | 11/30 | 10/24 | 11/08 | 12/22 | 12/25 |
16 | 2/15 | 1/10 | 1/29 | 3/11 | 3/24 | 12/13 | 11/03 | 11/19 | 12/28 | 1/16 |
Length of Growing Season (Days)
Derived from 1971-2000 Averages
Temp °F | Median | Shortest | 10% | 90% | Longest |
---|---|---|---|---|---|
32 | 193 | 149 | 171 | 211 | 223 |
30 | 204 | 154 | 186 | 228 | 247 |
28 | 223 | 195 | 202 | 246 | 251 |
24 | 247 | 206 | 213 | 271 | 274 |
20 | 278 | 235 | 244 | 300 | 303 |
16 | 296 | 237 | 276 | 328 | 346 |
Copyright 2007 Illinois State Water Survey
Last Modified: September 11, 2007