Frost history / Cahokia, IL
Cahokia, IL: frost dates by year
Last spring and first fall frost at NOAA station USC00111160, 1969 to 2011, measured from daily minimum temperatures.
Elevation 400 ft, 38.567, -90.194. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 9 | Oct 19 |
| Earliest | Mar 20 (2005) | Sep 23 (1989) |
| Latest | May 6 (1989) | Nov 9 (2004) |
| Trend | 1.2 days earlier per decade | 3.5 days later per decade |
| Years with data | 31 | 32 |
At 28°F (hard freeze) the median last spring date is Mar 31 and the median first fall date is Nov 2.
The trend is a straight-line fit through the years with a freeze. A positive spring trend means the last frost now comes later. Short or patchy records give noisy trends.
Chart
Last spring frost (32°F)
First fall frost (32°F)
Dots are single years. The gray line is the median, the green line the fitted trend.
Year by year
| Year | Last spring 32°F | First fall 32°F | Last spring 28°F | First fall 28°F |
|---|---|---|---|---|
| 2011 | no data | Oct 29 | no data | Nov 11 |
| 2010 | Mar 27 | Oct 29 | Mar 26 | Nov 6 |
| 2009 | Apr 9 | Oct 18 | Mar 14 | Nov 27 |
| 2008 | Apr 29 | Oct 28 | Mar 24 | Nov 10 |
| 2007 | Apr 13 | Oct 29 | Apr 9 | Nov 2 |
| 2006 | Apr 9 | Oct 13 | Mar 26 | Oct 24 |
| 2005 | Mar 20 | Oct 26 | Mar 20 | Nov 17 |
| 2004 | no data | Nov 9 | no data | Nov 25 |
| 2002 | Apr 5 | no data | Apr 5 | no data |
| 2001 | Apr 18 | Oct 17 | Mar 27 | Oct 28 |
| 2000 | Apr 9 | Oct 7 | Mar 13 | Nov 15 |
| 1999 | Mar 27 | Oct 18 | Mar 27 | Nov 26 |
| 1998 | Apr 5 | Nov 5 | Mar 24 | Nov 7 |
| 1997 | Apr 14 | Oct 22 | Apr 14 | Oct 28 |
| 1996 | Apr 10 | no data | Apr 10 | no data |
| 1995 | Apr 5 | Oct 25 | Apr 1 | Nov 3 |
| 1994 | Apr 7 | Oct 26 | Apr 7 | Nov 29 |
| 1993 | Apr 17 | Oct 31 | Mar 18 | Nov 1 |
| 1992 | Apr 28 | Oct 19 | Mar 24 | Oct 19 |
| 1991 | Mar 30 | Oct 15 | Mar 29 | Nov 1 |
| 1990 | Apr 17 | Oct 10 | Apr 11 | Nov 8 |
| 1989 | May 6 | Sep 23 | Apr 11 | Oct 31 |
| 1988 | Apr 28 | Oct 5 | Apr 18 | Oct 12 |
| 1987 | Apr 11 | Oct 3 | Apr 3 | Oct 6 |
| 1986 | Apr 22 | Nov 9 | Mar 21 | Nov 9 |
| 1985 | Apr 8 | Sep 30 | Apr 8 | Oct 1 |
| 1979 | Apr 7 | Oct 10 | Apr 7 | Oct 14 |
| 1978 | no data | Oct 8 | no data | Dec 1 |
| 1977 | Mar 25 | Oct 13 | Mar 7 | Nov 13 |
| 1976 | Apr 26 | Oct 18 | Mar 23 | Oct 18 |
| 1975 | Apr 12 | Oct 26 | Mar 31 | Nov 14 |
| 1974 | Apr 9 | Oct 3 | Apr 9 | Oct 21 |
| 1972 | Apr 9 | Oct 19 | Apr 8 | Oct 19 |
| 1970 | Apr 9 | no data | Apr 6 | no data |
| 1969 | no data | Oct 23 | no data | Oct 28 |
"none" means the station recorded no freeze at that threshold in that half of the year. "no data" means more than 10% of the season's daily readings were missing. Years with no usable data are left out. See the methodology for the rules, and the ZIP lookup for 1991 to 2020 frost probabilities.