Frost history / Prairie City 2S, IL

Prairie City 2S, IL: frost dates by year

Last spring and first fall frost at NOAA station USC00116970, 2003 to 2024, measured from daily minimum temperatures.

Elevation 650 ft, 40.591, -90.464. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 21	Oct 19
Earliest	Mar 23 (2017)	Oct 2 (2003)
Latest	May 12 (2021)	Nov 12 (2016)
Trend	5.2 days later per decade	1.9 days later per decade
Years with data	21	22

At 28°F (hard freeze) the median last spring date is Apr 5 and the median first fall date is Oct 30.

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
2024	Apr 22	Oct 16	Mar 20	Nov 26
2023	Apr 25	Oct 30	Mar 21	Oct 31
2022	Apr 27	Oct 8	Mar 29	Oct 18
2021	May 12	Nov 2	Apr 22	Nov 2
2020	May 10	Oct 16	Apr 17	Nov 2
2019	Apr 29	Oct 12	Apr 16	Oct 31
2018	Apr 18	Oct 16	Apr 18	Oct 16
2017	Mar 23	Oct 29	Mar 23	Oct 29
2016	Apr 13	Nov 12	Apr 13	Nov 20
2015	Apr 24	Oct 17	Apr 5	Nov 20
2014	Apr 19	Oct 30	Apr 16	Nov 1
2013	Apr 21	Oct 22	Apr 5	Oct 23
2012	Apr 12	Oct 6	Apr 12	Oct 6
2011	May 5	Oct 22	Mar 29	Oct 29
2010	Mar 30	Oct 29	Mar 27	Oct 29
2009	Apr 13	Oct 11	Mar 21	Nov 27
2008	Apr 30	Oct 28	Mar 30	Oct 28
2007	Apr 16	Nov 1	Apr 8	Nov 7
2006	Apr 10	Oct 12	Mar 27	Oct 13
2005	May 4	Oct 27	Mar 18	Nov 10
2004	Apr 15	Oct 17	Apr 14	Oct 17
2003	no data	Oct 2	no data	Oct 3

"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.