Havana, IL: frost dates by year

Last spring and first fall frost at NOAA station USC00113940, 1967 to 2006, measured from daily minimum temperatures.

Elevation 463 ft, 40.303, -90.065. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 18	Oct 11
Earliest	Mar 31 (1969)	Sep 22 (1999)
Latest	May 21 (2002)	Nov 5 (1973)
Trend	2.5 days later per decade	2.2 days earlier per decade
Years with data	35	39

At 28°F (hard freeze) the median last spring date is Apr 7 and the median first fall date is Oct 22.

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
2006	Apr 9	Oct 12	Mar 26	Oct 15
2005	no data	Oct 26	no data	Oct 28
2004	Apr 14	Oct 5	Apr 14	Oct 5
2003	Apr 23	Sep 29	Apr 11	Oct 2
2002	May 21	Oct 13	Apr 7	Oct 14
2001	Apr 19	Oct 6	Apr 18	Oct 17
2000	Apr 13	Sep 26	Apr 12	Oct 7
1999	Apr 19	Sep 22	Mar 27	Oct 5
1998	Apr 18	Oct 14	Apr 5	Oct 22
1997	May 16	Oct 15	Apr 15	Oct 15
1996	Apr 27	Oct 11	Apr 14	Oct 19
1995	Apr 6	Sep 23	Apr 6	Sep 23
1994	Apr 8	Oct 25	Apr 8	Oct 27
1993	Apr 22	Oct 10	Apr 3	Nov 1
1992	Apr 28	Oct 17	Apr 5	Oct 19
1991	Mar 31	Oct 16	Mar 30	Oct 20
1990	Apr 19	Oct 11	Apr 12	Oct 26
1989	May 7	Sep 24	Apr 14	Nov 3
1988	Apr 20	Oct 6	Mar 30	Oct 13
1987	Apr 10	Oct 3	Apr 4	Oct 8
1986	Apr 23	Oct 15	Apr 23	Nov 10
1985	Apr 10	Oct 2	Apr 9	Nov 20
1984	no data	Sep 30	no data	Nov 2
1983	Apr 21	no data	Apr 20	no data
1982	Apr 21	Oct 21	Apr 11	Oct 21
1981	Apr 7	Oct 3	Apr 6	Oct 23
1980	no data	Oct 5	no data	Oct 5
1979	Apr 10	Oct 7	Apr 10	Oct 14
1978	no data	Oct 8	no data	Nov 19
1977	Apr 6	Oct 13	Mar 23	Oct 13
1976	May 3	Oct 16	Mar 28	Oct 22
1975	Apr 12	Oct 26	Apr 7	Oct 26
1974	Apr 9	Sep 23	Apr 9	Nov 14
1973	Apr 13	Nov 5	Apr 13	Nov 5
1972	Apr 25	Oct 15	Apr 8	Oct 19
1971	Apr 30	Oct 12	Apr 5	Nov 4
1970	Apr 7	Oct 17	Apr 5	Nov 15
1969	Mar 31	Oct 15	Mar 31	Oct 23
1968	Apr 15	Oct 25	Mar 24	Oct 29
1967	no data	Oct 11	no data	Nov 4

"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.