Precipitation Summary
Station: 111475 CHENOA, IL
1971-2000 NCDC Normals
| Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Prec. (in) | 1.52 | 1.43 | 3.02 | 3.31 | 3.88 | 4.10 | 3.33 | 3.22 | 2.91 | 2.69 | 2.73 | 2.47 | 34.61 |
Precipitation Extremes
Period of Record: 1944-2006
| Month | High (in) | Year | Low (in) | Year | 1-Day Max (in) |
Date |
|---|---|---|---|---|---|---|
| Jan | 8.21 | 1965 | 0.00 | 2000 | 2.95 | 01-01-1965 |
| Feb | 4.70 | 1997 | 0.00 | 2002 | 1.70 | 02-01-1968 |
| Mar | 6.95 | 1985 | 0.30 | 1958 | 3.73 | 03-28-1985 |
| Apr | 10.78 | 1957 | 0.31 | 1971 | 3.33 | 04-24-1950 |
| May | 8.11 | 1995 | 0.20 | 1992 | 2.45 | 05-24-1995 |
| Jun | 8.19 | 1993 | 0.21 | 1988 | 3.77 | 06-25-1968 |
| Jul | 9.00 | 1951 | 0.48 | 1991 | 8.20 | 07-09-1951 |
| Aug | 8.67 | 1977 | 0.51 | 1950 | 3.93 | 08-17-1997 |
| Sep | 11.95 | 1961 | 0.06 | 1979 | 2.47 | 09-13-1970 |
| Oct | 8.04 | 1986 | 0.00 | 1964 | 5.66 | 10-03-1986 |
| Nov | 7.56 | 1985 | 0.36 | 1998 | 2.21 | 11-18-2003 |
| Dec | 8.95 | 1982 | 0.10 | 1955 | 5.07 | 12-03-1982 |
| Annual | 50.71 | 1965 | 20.08 | 1988 | 8.20 | 07-09-1951 |
| Winter | 14.88 | 1950 | 1.33 | 1963 | 5.07 | 12-03-1982 |
| Spring | 17.82 | 1995 | 3.78 | 1958 | 3.73 | 03-28-1985 |
| Summer | 20.87 | 1951 | 2.52 | 1988 | 8.20 | 07-09-1951 |
| Fall | 16.47 | 1961 | 3.00 | 1999 | 5.66 | 10-03-1986 |
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 | 7.6 | 3.9 | 0.8 | 0.2 |
| Feb | 6.8 | 3.7 | 0.8 | 0.3 |
| Mar | 9.2 | 6.3 | 2.1 | 0.4 |
| Apr | 10.6 | 6.9 | 2.5 | 0.6 |
| May | 10.7 | 7.5 | 2.8 | 0.9 |
| Jun | 9.7 | 6.7 | 2.8 | 1.2 |
| Jul | 8.2 | 5.9 | 2.5 | 0.7 |
| Aug | 7.6 | 5.3 | 2.0 | 0.9 |
| Sep | 7.3 | 5.4 | 2.0 | 0.9 |
| Oct | 8.0 | 5.4 | 1.6 | 0.5 |
| Nov | 8.7 | 5.9 | 1.8 | 0.5 |
| Dec | 8.5 | 4.9 | 1.3 | 0.5 |
| Annual | 103.0 | 67.8 | 22.9 | 7.6 |
| Winter | 22.9 | 12.5 | 2.9 | 1.0 |
| Spring | 30.5 | 20.6 | 7.4 | 2.0 |
| Summer | 25.5 | 17.9 | 7.2 | 2.8 |
| Fall | 24.1 | 16.8 | 5.4 | 1.9 |
Temperature Summary
Station 111475 CHENOA, IL
1971-2000 NCDC Normals
| Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 31.5 | 37.2 | 49.6 | 62.9 | 74.3 | 83.3 | 85.6 | 83.7 | 77.8 | 65.6 | 49.5 | 36.2 | 61.4 |
| Low °F | 14.6 | 19.8 | 30.1 | 39.9 | 50.9 | 60.3 | 63.8 | 61.6 | 53.8 | 42.8 | 32.0 | 20.8 | 40.9 |
| Mean °F | 23.1 | 28.5 | 39.9 | 51.4 | 62.6 | 71.8 | 74.7 | 72.7 | 65.8 | 54.2 | 40.8 | 28.5 | 51.2 |
| HDD | 1300 | 1023 | 781 | 414 | 165 | 15 | 2 | 16 | 77 | 349 | 728 | 1132 | 6002 |
| CDD | 0 | 0 | 0 | 6 | 90 | 219 | 303 | 253 | 101 | 14 | 0 | 0 | 986 |
HDD – heating degree days (base 65F); CDD – cooling degree days (base 65F)
Temperature Extremes
Period of Record: 1951-2006
| Month | High Mean °F |
Year | Low Mean °F |
Year | 1-Day Max °F |
Date | 1-Day Min °F |
Date |
|---|---|---|---|---|---|---|---|---|
| Jan | 37.3 | 2006 | 8.9 | 1977 | 67 | 01-24-1967 | -23 | 01-20-1985 |
| Feb | 39.4 | 1998 | 14.3 | 1978 | 73 | 02-26-1996 | -19 | 02-03-1996 |
| Mar | 46.4 | 2000 | 24.2 | 1960 | 85 | 03-31-1981 | -6 | 03-04-2002 |
| Apr | 57.6 | 1977 | 44.9 | 1961 | 91 | 04-25-1986 | 7 | 04-07-1982 |
| May | 69.4 | 1991 | 56.5 | 1967 | 95 | 05-19-1975 | 22 | 05-10-1966 |
| Jun | 76.8 | 1971 | 66.2 | 1982 | 102 | 06-20-1953 | 36 | 06-11-1972 |
| Jul | 79.8 | 1955 | 71.4 | 1971 | 103 | 07-14-1954 | 45 | 07-05-1967 |
| Aug | 79.1 | 1995 | 67.4 | 1992 | 103 | 08-17-1988 | 37 | 08-18-1963 |
| Sep | 71.4 | 2005 | 61.1 | 1975 | 100 | 09-01-1953 | 24 | 09-23-1974 |
| Oct | 63.2 | 1963 | 47.8 | 1976 | 92 | 10-02-1953 | 17 | 10-29-1952 |
| Nov | 49.7 | 2001 | 32.3 | 1976 | 79 | 11-01-2000 | -4 | 11-29-1955 |
| Dec | 36.2 | 1965 | 15.6 | 1983 | 70 | 12-02-1982 | -26 | 12-22-1989 |
| Annual | 54.7 | 1998 | 47.2 | 1968 | 103 | 07-14-1954 | -26 | 12-22-1989 |
| Winter | 33.6 | 2002 | 18.6 | 1979 | 73 | 02-26-1996 | -26 | 12-22-1989 |
| Spring | 57.3 | 1977 | 45.5 | 1960 | 95 | 05-19-1975 | -6 | 03-04-1902 |
| Summer | 76.5 | 1995 | 69.2 | 1992 | 103 | 07-14-1954 | 36 | 06-11-1972 |
| Fall | 57.6 | 1998 | 47.7 | 1976 | 100 | 09-01-1953 | -4 | 11-29-1955 |
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 | 15.7 | 29.0 | 5.4 |
| Feb | 0.0 | 9.8 | 24.2 | 3.0 |
| Mar | 0.0 | 2.4 | 19.3 | 0.1 |
| Apr | 0.1 | 0.0 | 6.6 | 0.0 |
| May | 1.6 | 0.0 | 0.4 | 0.0 |
| Jun | 6.1 | 0.0 | 0.0 | 0.0 |
| Jul | 7.9 | 0.0 | 0.0 | 0.0 |
| Aug | 5.3 | 0.0 | 0.0 | 0.0 |
| Sep | 2.3 | 0.0 | 0.2 | 0.0 |
| Oct | 0.0 | 0.0 | 4.7 | 0.0 |
| Nov | 0.0 | 1.8 | 16.9 | 0.0 |
| Dec | 0.0 | 10.4 | 26.9 | 2.5 |
| Annual | 23.3 | 40.2 | 127.5 | 10.8 |
| Winter | 0.0 | 35.9 | 80.1 | 10.8 |
| Spring | 1.7 | 2.4 | 26.1 | 0.1 |
| Summer | 19.4 | 0.0 | 0.0 | 0.0 |
| Fall | 2.3 | 1.8 | 21.8 | 0.0 |
Snowfall Summary
Station: 111475 CHENOA, IL
1971-2000 Averages
| Element | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ann |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snow (in) | 7.2 | 5.2 | 2.5 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 1.6 | 5.4 | 23.0 |
Snowfall Extremes
Period of Record: 1944-2006
| Month | High (in) | Year | 1-Day Max (in) | Date |
|---|---|---|---|---|
| Jan | 24.1 | 1979 | 10.0 | 01-26-1967 |
| Feb | 16.5 | 1986 | 7.0 | 02-14-1952 |
| Mar | 18.5 | 1960 | 7.0 | 03-16-1960 |
| Apr | 9.7 | 1982 | 7.7 | 04-11-1997 |
| May | 0.2 | 1989 | 0.2 | 05-07-1989 |
| Jun | 0.0 | – | – | – |
| Jul | 0.0 | – | – | – |
| Aug | 0.0 | – | – | – |
| Sep | 0.0 | – | – | – |
| Oct | 2.0 | 1967 | 2.0 | 10-27-1967 |
| Nov | 10.0 | 1951 | 8.0 | 11-06-1951 |
| Dec | 20.3 | 1973 | 12.0 | 12-19-1973 |
| Season (Jul-Jun) | 50.9 | 1977-1978 | 12.0 | 12-19-1973 |
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 | 3.9 | 2.2 | 1.0 | 0.2 |
| Feb | 3.9 | 2.2 | 1.0 | 0.2 |
| Mar | 1.9 | 0.8 | 0.5 | 0.1 |
| Apr | 0.6 | 0.4 | 0.2 | 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 | 0.1 | 0.0 | 0.0 | 0.0 |
| Nov | 1.3 | 0.6 | 0.3 | 0.1 |
| Dec | 4.1 | 1.7 | 1.1 | 0.2 |
| Annual | 16.9 | 8.5 | 4.5 | 0.7 |
Growing Season Summary
Station: 111475 CHENOA, 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 | 8 | 26 | 130 | 362 | 700 | 951 | 1076 | 1013 | 777 | 447 | 137 | 26 | 5625 |
| 45 | 2 | 9 | 72 | 238 | 546 | 802 | 922 | 858 | 627 | 308 | 74 | 11 | 4447 |
| 50 | 0 | 2 | 36 | 139 | 396 | 652 | 767 | 704 | 480 | 193 | 35 | 4 | 3391 |
| 55 | 0 | 0 | 15 | 71 | 260 | 503 | 612 | 549 | 338 | 105 | 12 | 1 | 2456 |
| 60 | 0 | 0 | 5 | 30 | 149 | 357 | 458 | 395 | 213 | 47 | 3 | 0 | 1649 |
| 50** | 4 | 17 | 83 | 221 | 436 | 633 | 734 | 683 | 501 | 271 | 77 | 13 | 3656 |
**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 | 4/23 | 3/29 | 4/06 | 5/10 | 5/12 | 10/08 | 9/23 | 9/24 | 10/24 | 11/04 |
| 30 | 4/17 | 3/28 | 4/05 | 5/03 | 5/08 | 10/17 | 9/23 | 9/28 | 11/05 | 11/17 |
| 28 | 4/09 | 3/24 | 3/27 | 4/24 | 4/29 | 10/18 | 9/23 | 10/02 | 11/09 | 11/20 |
| 24 | 4/05 | 3/14 | 3/16 | 4/13 | 4/23 | 11/03 | 9/23 | 10/18 | 11/15 | 12/11 |
| 20 | 3/21 | 2/28 | 3/03 | 4/08 | 4/09 | 11/15 | 10/19 | 11/02 | 12/01 | 12/11 |
| 16 | 3/13 | 2/12 | 2/26 | 3/27 | 4/07 | 11/25 | 11/02 | 11/10 | 12/11 | 12/21 |
Length of Growing Season (Days)
Derived from 1971-2000 Averages
| Temp °F | Median | Shortest | 10% | 90% | Longest |
|---|---|---|---|---|---|
| 32 | 170 | 138 | 147 | 192 | 201 |
| 30 | 181 | 152 | 167 | 203 | 222 |
| 28 | 194 | 152 | 172 | 216 | 226 |
| 24 | 213 | 167 | 191 | 241 | 248 |
| 20 | 241 | 208 | 217 | 260 | 272 |
| 16 | 256 | 222 | 234 | 283 | 286 |
Copyright 2007 Illinois State Water Survey
Last Modified: September 11, 2007