Precipitation Summary
Station: 113384 GENESEO, IL
1971-2000 NCDC Normals
Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Prec. (in) | 1.52 | 1.58 | 2.69 | 3.74 | 4.21 | 4.20 | 3.90 | 4.32 | 3.29 | 3.01 | 2.82 | 2.15 | 37.43 |
Precipitation Extremes
Period of Record: 1895-2006
Month | High (in) | Year | Low (in) | Year | 1-Day Max (in) |
Date |
---|---|---|---|---|---|---|
Jan | 4.90 | 1897 | 0.20 | 1961 | 3.05 | 01-12-1960 |
Feb | 3.97 | 1997 | 0.04 | 1969 | 1.86 | 02-21-1985 |
Mar | 6.15 | 1898 | 0.17 | 1958 | 2.03 | 03-17-1998 |
Apr | 7.31 | 1973 | 0.67 | 1946 | 3.01 | 04-21-1973 |
May | 12.19 | 1974 | 0.55 | 1992 | 3.93 | 05-16-1974 |
Jun | 11.58 | 1990 | 0.60 | 1991 | 6.00 | 06-24-1898 |
Jul | 12.85 | 1992 | 0.35 | 1991 | 5.00 | 07-30-1904 |
Aug | 13.69 | 1987 | 0.52 | 1976 | 6.57 | 08-25-1898 |
Sep | 12.61 | 1926 | 0.05 | 1979 | 5.20 | 09-03-1926 |
Oct | 9.36 | 1998 | 0.08 | 1964 | 4.75 | 10-17-1998 |
Nov | 6.70 | 1985 | 0.21 | 1904 | 3.31 | 11-17-1928 |
Dec | 4.69 | 1987 | 0.00 | 1939 | 2.56 | 12-02-1982 |
Annual | 56.93 | 1898 | 19.24 | 2005 | 6.57 | 08-25-1898 |
Winter | 8.43 | 1974 | 0.78 | 2003 | 3.05 | 01-12-1960 |
Spring | 19.47 | 1973 | 2.85 | 1934 | 3.93 | 05-16-1974 |
Summer | 24.19 | 1898 | 4.37 | 1991 | 6.57 | 08-25-1898 |
Fall | 18.48 | 1961 | 3.41 | 1952 | 5.20 | 09-03-1926 |
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 | 8.4 | 4.1 | 0.6 | 0.2 |
Feb | 6.8 | 3.6 | 0.9 | 0.2 |
Mar | 9.7 | 5.5 | 1.7 | 0.7 |
Apr | 10.5 | 6.7 | 2.4 | 1.0 |
May | 11.2 | 7.3 | 2.5 | 1.2 |
Jun | 10.1 | 6.8 | 2.7 | 1.2 |
Jul | 9.6 | 6.4 | 2.6 | 1.0 |
Aug | 9.3 | 6.4 | 2.6 | 1.3 |
Sep | 7.9 | 5.2 | 2.4 | 0.8 |
Oct | 8.7 | 5.3 | 1.9 | 0.6 |
Nov | 9.9 | 5.9 | 1.8 | 0.5 |
Dec | 8.5 | 4.8 | 1.3 | 0.4 |
Annual | 110.9 | 68.1 | 23.5 | 9.2 |
Winter | 23.8 | 12.5 | 2.8 | 0.9 |
Spring | 31.5 | 19.5 | 6.6 | 2.9 |
Summer | 29.1 | 19.7 | 7.9 | 3.5 |
Fall | 26.6 | 16.4 | 6.1 | 1.9 |
Temperature Summary
Station 113384 GENESEO, IL
1971-2000 NCDC Normals
Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
High °F | 28.7 | 34.4 | 47.2 | 61.1 | 73.1 | 82.4 | 85.7 | 83.2 | 75.7 | 63.3 | 46.9 | 33.4 | 59.6 |
Low °F | 13.4 | 19.3 | 29.5 | 40.2 | 51.6 | 61.3 | 65.7 | 63.5 | 54.9 | 43.2 | 31.1 | 19.2 | 41.1 |
Mean °F | 21.1 | 26.9 | 38.4 | 50.7 | 62.4 | 71.9 | 75.7 | 73.4 | 65.3 | 53.3 | 39.0 | 26.3 | 50.4 |
HDD | 1363 | 1068 | 826 | 436 | 167 | 14 | 1 | 13 | 80 | 372 | 780 | 1201 | 6321 |
CDD | 0 | 0 | 0 | 5 | 84 | 218 | 334 | 271 | 88 | 9 | 0 | 0 | 1009 |
HDD – heating degree days (base 65F); CDD – cooling degree days (base 65F)
Temperature Extremes
Period of Record: 1895-2006
Month | High Mean °F |
Year | Low Mean °F |
Year | 1-Day Max °F |
Date | 1-Day Min °F |
Date |
---|---|---|---|---|---|---|---|---|
Jan | 35.0 | 2006 | 7.5 | 1977 | 66 | 01-31-1989 | -23 | 01-10-1982 |
Feb | 37.5 | 1998 | 13.8 | 1979 | 71 | 02-25-2000 | -25 | 02-13-1905 |
Mar | 45.3 | 2000 | 22.1 | 1960 | 87 | 03-29-1986 | -13 | 03-01-1962 |
Apr | 56.9 | 1896 | 42.7 | 1907 | 92 | 04-25-1986 | 12 | 04-07-1982 |
May | 69.5 | 1977 | 55.1 | 1907 | 95 | 05-26-1985 | 26 | 05-10-1966 |
Jun | 77.5 | 1971 | 65.5 | 1903 | 101 | 06-19-1971 | 39 | 06-16-1961 |
Jul | 82.7 | 1901 | 70.6 | 1992 | 107 | 07-24-1901 | 47 | 07-07-1965 |
Aug | 79.1 | 1995 | 67.4 | 1967 | 103 | 08-17-1988 | 40 | 08-28-1986 |
Sep | 72.9 | 1906 | 60.1 | 1993 | 99 | 09-08-1971 | 25 | 09-30-1899 |
Oct | 64.6 | 1963 | 46.8 | 1976 | 92 | 10-03-1997 | 19 | 10-30-1988 |
Nov | 49.6 | 2001 | 30.5 | 1976 | 79 | 11-01-2000 | -7 | 11-29-1976 |
Dec | 35.7 | 1965 | 12.9 | 1983 | 70 | 12-04-1998 | -20 | 12-24-1983 |
Annual | 58.9 | 1956 | 47.6 | 1978 | 107 | 07-24-1901 | -25 | 02-13-1905 |
Winter | 32.2 | 2002 | 15.4 | 1979 | 71 | 02-25-1900 | -25 | 02-13-1905 |
Spring | 56.2 | 1977 | 44.9 | 1960 | 95 | 05-26-1985 | -13 | 03-01-1962 |
Summer | 77.2 | 1988 | 69.2 | 1992 | 107 | 07-24-1901 | 39 | 06-16-1961 |
Fall | 58.4 | 1963 | 46.6 | 1976 | 99 | 09-08-1971 | -7 | 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 | 18.1 | 29.6 | 6.7 |
Feb | 0.0 | 11.8 | 24.8 | 3.3 |
Mar | 0.0 | 3.6 | 20.8 | 0.1 |
Apr | 0.1 | 0.2 | 6.1 | 0.0 |
May | 1.2 | 0.0 | 0.2 | 0.0 |
Jun | 5.2 | 0.0 | 0.0 | 0.0 |
Jul | 8.7 | 0.0 | 0.0 | 0.0 |
Aug | 5.6 | 0.0 | 0.0 | 0.0 |
Sep | 1.9 | 0.0 | 0.2 | 0.0 |
Oct | 0.1 | 0.0 | 3.9 | 0.0 |
Nov | 0.0 | 3.0 | 18.0 | 0.2 |
Dec | 0.0 | 12.5 | 28.0 | 3.5 |
Annual | 22.9 | 49.2 | 131.3 | 13.8 |
Winter | 0.0 | 42.3 | 82.5 | 13.5 |
Spring | 1.3 | 3.7 | 26.7 | 0.1 |
Summer | 19.5 | 0.0 | 0.0 | 0.0 |
Fall | 2.0 | 3.0 | 22.1 | 0.2 |
Snowfall Summary
Station: 113384 GENESEO, IL
1971-2000 Averages
Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Snow (in) | 8.4 | 5.5 | 3.2 | 1.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 2.1 | 7.2 | 27.7 |
Snowfall Extremes
Period of Record: 1895-2006
Month | High (in) | Year | 1-Day Max (in) | Date |
---|---|---|---|---|
Jan | 20.9 | 1979 | 16.0 | 01-03-1971 |
Feb | 20.8 | 1960 | 12.0 | 02-03-1901 |
Mar | 18.0 | 1972 | 9.0 | 03-02-2002 |
Apr | 10.5 | 1970 | 8.5 | 04-02-1975 |
May | 0.0 | – | – | – |
Jun | 0.0 | – | – | – |
Jul | 0.0 | – | – | – |
Aug | 0.0 | – | – | – |
Sep | 0.0 | – | – | – |
Oct | 6.0 | 1898 | 6.0 | 10-25-1898 |
Nov | 11.3 | 1974 | 8.5 | 11-26-1975 |
Dec | 24.8 | 2000 | 14.5 | 12-15-1987 |
Season (Jul-Jun) | 53.7 | 1978-1979 | 16.0 | 01-03-1971 |
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 | 3.3 | 1.9 | 0.9 | 0.3 |
Feb | 3.3 | 1.9 | 0.9 | 0.3 |
Mar | 2.0 | 1.3 | 0.6 | 0.1 |
Apr | 0.3 | 0.2 | 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 | 1.6 | 0.8 | 0.5 | 0.1 |
Dec | 3.9 | 2.4 | 1.3 | 0.3 |
Annual | 16.2 | 9.2 | 4.8 | 1.2 |
Growing Season Summary
Station: 113384 GENESEO, 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 | 4 | 19 | 108 | 338 | 690 | 954 | 1102 | 1025 | 750 | 413 | 107 | 15 | 5526 |
45 | 1 | 6 | 58 | 218 | 536 | 804 | 947 | 870 | 601 | 277 | 54 | 6 | 4381 |
50 | 0 | 1 | 29 | 123 | 387 | 654 | 793 | 715 | 454 | 167 | 23 | 2 | 3352 |
55 | 0 | 0 | 12 | 61 | 252 | 504 | 638 | 561 | 314 | 89 | 8 | 0 | 2443 |
60 | 0 | 0 | 4 | 28 | 144 | 357 | 483 | 406 | 193 | 38 | 2 | 0 | 1659 |
50** | 3 | 11 | 69 | 198 | 420 | 634 | 754 | 692 | 471 | 238 | 56 | 8 | 3557 |
**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 | 4/18 | 3/26 | 4/05 | 5/05 | 5/17 | 10/12 | 9/23 | 9/27 | 11/02 | 11/10 |
30 | 4/15 | 3/24 | 3/31 | 4/28 | 5/17 | 10/19 | 10/02 | 10/07 | 11/05 | 11/16 |
28 | 4/08 | 3/24 | 3/27 | 4/23 | 4/29 | 10/30 | 10/02 | 10/13 | 11/15 | 11/17 |
24 | 4/04 | 3/14 | 3/17 | 4/11 | 4/18 | 11/07 | 10/10 | 10/20 | 11/19 | 11/28 |
20 | 3/18 | 2/20 | 2/27 | 4/07 | 4/09 | 11/15 | 10/20 | 11/03 | 12/02 | 12/21 |
16 | 3/09 | 2/09 | 2/18 | 3/27 | 4/07 | 11/27 | 11/01 | 11/10 | 12/13 | 12/27 |
Length of Growing Season (Days)
Derived from 1971-2000 Averages
Temp °F | Median | Shortest | 10% | 90% | Longest |
---|---|---|---|---|---|
32 | 176 | 137 | 155 | 205 | 217 |
30 | 187 | 161 | 169 | 211 | 226 |
28 | 203 | 161 | 182 | 223 | 232 |
24 | 218 | 189 | 201 | 237 | 248 |
20 | 247 | 194 | 218 | 274 | 283 |
16 | 261 | 220 | 236 | 292 | 310 |
Copyright 2007 Illinois State Water Survey
Last Modified: September 11, 2007