Grayville, IL: frost dates by year

Last spring and first fall frost at NOAA station USC00113612, 2001 to 2012, measured from daily minimum temperatures.

Elevation 435 ft, 38.276, -87.999. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Mar 31	Oct 29
Earliest	Mar 11 (2012)	Oct 7 (2001)
Latest	Apr 14 (2007)	Nov 13 (2004)
Trend	14.5 days earlier per decade	14.0 days later per decade
Years with data	10	10

At 28°F (hard freeze) the median last spring date is Mar 25 and the median first fall date is Nov 10.

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
2012	Mar 11	no data	Mar 6	no data
2011	Apr 2	Nov 10	Mar 27	Nov 11
2010	Mar 27	Oct 30	Mar 7	Nov 6
2009	Apr 9	Oct 18	Mar 14	Dec 4
2008	Mar 25	Oct 28	Mar 12	Nov 10
2007	Apr 14	Nov 7	Apr 10	Nov 16
2006	Mar 27	Oct 15	Mar 23	Nov 3
2005	Mar 30	no data	Mar 30	no data
2004	no data	Nov 13	no data	Nov 25
2003	Apr 7	Nov 7	Mar 31	Nov 8
2002	Apr 6	Oct 14	Apr 5	Nov 2
2001	no data	Oct 7	no data	Dec 10

"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.