Precipitation Summary
Station: 116446 OLNEY 2S, IL
1971-2000 NCDC Normals
Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Prec. (in) | 2.84 | 2.73 | 4.35 | 4.38 | 4.76 | 4.07 | 4.13 | 3.55 | 3.09 | 3.34 | 4.39 | 3.65 | 45.28 |
Precipitation Extremes
Period of Record: 1890-2006
Month | High (in) | Year | Low (in) | Year | 1-Day Max (in) |
Date |
---|---|---|---|---|---|---|
Jan | 12.02 | 1950 | 0.10 | 1986 | 3.17 | 01-01-1948 |
Feb | 7.03 | 1950 | 0.05 | 1947 | 3.35 | 02-20-1891 |
Mar | 12.04 | 1945 | 0.27 | 1910 | 6.30 | 03-25-1904 |
Apr | 13.31 | 1893 | 0.99 | 1899 | 3.75 | 04-19-1959 |
May | 12.79 | 1943 | 0.77 | 1914 | 5.37 | 05-07-1961 |
Jun | 9.59 | 1945 | 0.46 | 1978 | 4.43 | 06-18-1911 |
Jul | 11.73 | 1958 | 0.25 | 1901 | 4.55 | 07-10-1933 |
Aug | 11.17 | 2000 | 0.39 | 1943 | 4.12 | 08-03-1924 |
Sep | 12.23 | 1911 | 0.03 | 1963 | 6.43 | 09-03-1926 |
Oct | 12.32 | 1919 | 0.13 | 1895 | 4.60 | 10-18-1905 |
Nov | 12.21 | 1985 | 0.22 | 1999 | 5.34 | 11-14-1993 |
Dec | 9.98 | 1982 | 0.46 | 1896 | 3.95 | 12-03-1982 |
Annual | 63.75 | 1945 | 25.56 | 1936 | 6.43 | 09-03-1926 |
Winter | 24.10 | 1950 | 3.57 | 1931 | 3.95 | 12-03-1982 |
Spring | 24.60 | 1996 | 3.91 | 1930 | 6.30 | 03-25-1904 |
Summer | 27.24 | 2000 | 3.61 | 1936 | 4.55 | 07-10-1933 |
Fall | 19.62 | 1919 | 2.92 | 1999 | 6.43 | 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 | 9.4 | 5.7 | 1.9 | 0.6 |
Feb | 8.0 | 5.1 | 1.8 | 0.7 |
Mar | 11.4 | 7.7 | 3.3 | 1.1 |
Apr | 11.8 | 8.3 | 3.1 | 1.0 |
May | 10.8 | 7.4 | 3.2 | 1.4 |
Jun | 9.5 | 6.7 | 3.0 | 1.1 |
Jul | 8.6 | 6.0 | 2.7 | 1.2 |
Aug | 8.2 | 5.6 | 2.7 | 1.1 |
Sep | 7.5 | 5.1 | 2.0 | 0.9 |
Oct | 8.0 | 5.0 | 2.2 | 0.9 |
Nov | 9.7 | 6.8 | 3.1 | 1.3 |
Dec | 10.1 | 6.4 | 2.6 | 0.9 |
Annual | 112.9 | 75.7 | 31.5 | 12.2 |
Winter | 27.5 | 17.2 | 6.3 | 2.2 |
Spring | 34.0 | 23.4 | 9.5 | 3.5 |
Summer | 26.3 | 18.2 | 8.4 | 3.4 |
Fall | 25.1 | 16.9 | 7.3 | 3.1 |
Temperature Summary
Station 116446 OLNEY 2S, IL
1971-2000 NCDC Normals
Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
High °F | 36.4 | 42.2 | 53.5 | 64.9 | 74.9 | 84.2 | 87.5 | 85.9 | 79.8 | 68.6 | 53.7 | 41.4 | 64.4 |
Low °F | 18.7 | 22.5 | 31.8 | 41.9 | 51.8 | 62.0 | 65.5 | 63.2 | 55.0 | 43.6 | 33.8 | 24.3 | 42.8 |
Mean °F | 27.6 | 32.4 | 42.7 | 53.4 | 63.4 | 73.1 | 76.5 | 74.6 | 67.4 | 56.1 | 43.8 | 32.9 | 53.7 |
HDD | 1161 | 915 | 693 | 353 | 141 | 7 | 0 | 4 | 53 | 303 | 638 | 996 | 5264 |
CDD | 0 | 0 | 0 | 5 | 90 | 250 | 356 | 300 | 125 | 26 | 0 | 0 | 1152 |
HDD – heating degree days (base 65F); CDD – cooling degree days (base 65F)
Temperature Extremes
Period of Record: 1896-2006
Month | High Mean °F |
Year | Low Mean °F |
Year | 1-Day Max °F |
Date | 1-Day Min °F |
Date |
---|---|---|---|---|---|---|---|---|
Jan | 41.6 | 1933 | 13.2 | 1918 | 75 | 01-24-1943 | -24 | 01-19-1994 |
Feb | 44.0 | 1938 | 20.0 | 1978 | 78 | 02-29-1972 | -25 | 02-02-1951 |
Mar | 57.3 | 1946 | 31.0 | 1960 | 89 | 03-24-1910 | -15 | 03-05-1978 |
Apr | 61.8 | 1925 | 45.4 | 1907 | 91 | 04-11-1930 | 21 | 04-05-1944 |
May | 72.5 | 1962 | 57.6 | 1917 | 98 | 05-27-1911 | 29 | 05-01-1963 |
Jun | 79.8 | 1952 | 68.2 | 1916 | 106 | 06-29-1931 | 36 | 06-16-1917 |
Jul | 85.1 | 1936 | 72.9 | 1967 | 112 | 07-14-1936 | 45 | 07-01-1937 |
Aug | 83.1 | 1936 | 68.8 | 1915 | 109 | 08-08-1930 | 41 | 08-31-1915 |
Sep | 76.7 | 1925 | 60.3 | 1918 | 106 | 09-05-1925 | 27 | 09-30-1899 |
Oct | 65.1 | 1947 | 47.9 | 1917 | 97 | 10-02-1953 | 17 | 10-29-1952 |
Nov | 54.9 | 1909 | 36.8 | 1976 | 89 | 11-23-1923 | -2 | 11-30-1929 |
Dec | 45.3 | 1923 | 20.7 | 1989 | 74 | 12-02-1982 | -19 | 12-22-1989 |
Annual | 59.9 | 1921 | 48.8 | 1912 | 112 | 07-14-1936 | -25 | 02-02-1951 |
Winter | 42.4 | 1932 | 22.0 | 1918 | 78 | 02-29-1972 | -25 | 02-02-1951 |
Spring | 59.9 | 1921 | 50.6 | 1984 | 98 | 05-27-1911 | -15 | 03-05-1978 |
Summer | 81.1 | 1936 | 71.3 | 1915 | 112 | 07-14-1936 | 36 | 06-16-1917 |
Fall | 63.0 | 1931 | 51.3 | 1976 | 106 | 09-05-1925 | -2 | 11-30-1929 |
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 | 11.0 | 25.5 | 2.4 |
Feb | 0.0 | 5.7 | 19.6 | 1.6 |
Mar | 0.0 | 1.1 | 14.2 | 0.1 |
Apr | 0.0 | 0.0 | 4.1 | 0.0 |
May | 0.9 | 0.0 | 0.2 | 0.0 |
Jun | 7.3 | 0.0 | 0.0 | 0.0 |
Jul | 12.5 | 0.0 | 0.0 | 0.0 |
Aug | 9.0 | 0.0 | 0.0 | 0.0 |
Sep | 3.8 | 0.0 | 0.0 | 0.0 |
Oct | 0.1 | 0.0 | 4.1 | 0.0 |
Nov | 0.0 | 0.5 | 12.6 | 0.0 |
Dec | 0.0 | 5.9 | 22.1 | 1.1 |
Annual | 33.6 | 24.4 | 103.4 | 5.3 |
Winter | 0.0 | 22.5 | 67.1 | 5.1 |
Spring | 0.9 | 1.1 | 18.8 | 0.1 |
Summer | 29.0 | 0.0 | 0.0 | 0.0 |
Fall | 3.9 | 0.5 | 16.6 | 0.0 |
Snowfall Summary
Station: 116446 OLNEY 2S, IL
1971-2000 Averages
Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Snow (in) | 4.2 | 3.1 | 1.9 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.7 | 3.3 | 13.4 |
Snowfall Extremes
Period of Record: 1890-2006
Month | High (in) | Year | 1-Day Max (in) | Date |
---|---|---|---|---|
Jan | 24.5 | 1918 | 12.0 | 01-15-1918 |
Feb | 18.5 | 1910 | 11.5 | 02-16-1910 |
Mar | 17.0 | 1960 | 10.0 | 03-13-1937 |
Apr | 6.0 | 1917 | 5.0 | 04-09-1917 |
May | 0.0 | – | – | – |
Jun | 0.0 | – | – | – |
Jul | 0.0 | – | – | – |
Aug | 0.0 | – | – | – |
Sep | 0.0 | – | – | – |
Oct | 2.2 | 1925 | 1.5 | 10-23-1917 |
Nov | 6.1 | 1932 | 5.3 | 11-26-1902 |
Dec | 13.6 | 2000 | 7.3 | 12-25-2002 |
Season (Jul-Jun) | 37.0 | 1917-1918 | 12.0 | 01-15-1918 |
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 | 1.6 | 1.0 | 0.5 | 0.2 |
Feb | 1.6 | 1.0 | 0.5 | 0.2 |
Mar | 1.0 | 0.7 | 0.3 | 0.2 |
Apr | 0.1 | 0.1 | 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 | 0.4 | 0.3 | 0.2 | 0.0 |
Dec | 1.7 | 1.1 | 0.7 | 0.2 |
Annual | 7.1 | 4.9 | 2.7 | 0.7 |
Growing Season Summary
Station: 116446 OLNEY 2S, 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 | 34 | 70 | 223 | 465 | 778 | 1016 | 1164 | 1101 | 859 | 544 | 225 | 62 | 6356 |
45 | 14 | 33 | 135 | 328 | 623 | 866 | 1009 | 947 | 710 | 397 | 137 | 29 | 5080 |
50 | 5 | 12 | 75 | 210 | 469 | 716 | 854 | 792 | 561 | 266 | 75 | 13 | 3935 |
55 | 1 | 3 | 35 | 120 | 323 | 567 | 699 | 638 | 416 | 159 | 34 | 4 | 2916 |
60 | 0 | 0 | 13 | 57 | 195 | 418 | 544 | 483 | 280 | 79 | 12 | 0 | 2027 |
50** | 17 | 40 | 133 | 283 | 499 | 690 | 802 | 754 | 567 | 343 | 126 | 31 | 4165 |
**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 | 4/14 | 3/25 | 3/31 | 5/08 | 5/12 | 10/11 | 9/22 | 10/02 | 10/21 | 10/25 |
30 | 4/10 | 3/24 | 3/29 | 4/23 | 5/05 | 10/21 | 10/02 | 10/05 | 11/05 | 11/13 |
28 | 4/07 | 3/18 | 3/24 | 4/18 | 4/23 | 10/24 | 10/04 | 10/13 | 11/12 | 11/23 |
24 | 3/22 | 2/28 | 3/08 | 4/10 | 4/19 | 11/04 | 10/08 | 10/16 | 11/28 | 12/04 |
20 | 3/12 | 2/22 | 2/27 | 3/20 | 3/26 | 11/19 | 10/24 | 11/02 | 12/10 | 12/22 |
16 | 2/21 | 12/13 | 2/02 | 3/14 | 3/25 | 12/05 | 11/05 | 11/07 | 12/22 | 1/02 |
Length of Growing Season (Days)
Derived from 1971-2000 Averages
Temp °F | Median | Shortest | 10% | 90% | Longest |
---|---|---|---|---|---|
32 | 181 | 144 | 152 | 198 | 212 |
30 | 193 | 163 | 170 | 214 | 225 |
28 | 204 | 175 | 188 | 225 | 235 |
24 | 224 | 191 | 204 | 257 | 266 |
20 | 254 | 222 | 230 | 283 | 292 |
16 | 283 | 238 | 260 | 317 | 343 |
Copyright 2007 Illinois State Water Survey
Last Modified: September 11, 2007