Maryville 2E, MO: frost dates by year

Last spring and first fall frost at NOAA station USC00235340, 1951 to 2019, measured from daily minimum temperatures.

Elevation 985 ft, 40.346, -94.834. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 23	Oct 10
Earliest	Mar 10 (2012)	Sep 18 (1981)
Latest	May 23 (1963)	Nov 9 (2016)
Trend	2.1 days earlier per decade	0.7 days later per decade
Years with data	64	63

At 28°F (hard freeze) the median last spring date is Apr 12 and the median first fall date is Oct 20.

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
2019	Apr 24	Oct 12	Apr 13	Oct 12
2018	Apr 20	Oct 15	Apr 19	Oct 21
2017	Apr 7	Oct 28	Mar 16	Oct 28
2016	Apr 12	Nov 9	Apr 11	Nov 12
2015	Apr 23	Oct 29	Mar 28	Nov 8
2014	Apr 19	Oct 31	Apr 16	Nov 1
2013	May 12	no data	Apr 24	no data
2012	Mar 10	no data	Mar 10	no data
2011	Apr 6	Oct 19	Apr 6	Oct 21
2010	Apr 10	Oct 19	Mar 23	Oct 29
2009	Apr 12	Oct 4	Apr 8	Oct 11
2008	Apr 15	Oct 27	Apr 15	Oct 28
2007	Apr 16	Oct 11	Apr 15	Nov 1
2006	Apr 10	Oct 12	Mar 26	Oct 14
2005	May 1	Oct 7	Apr 3	Oct 25
2004	May 4	Oct 2	Apr 14	Nov 5
2003	Apr 11	Sep 29	Apr 11	Nov 6
2002	Apr 6	Oct 7	Apr 6	Oct 14
2001	Apr 25	Oct 10	Mar 28	Oct 10
2000	Apr 13	Oct 6	Apr 13	Oct 7
1999	Apr 19	Oct 4	Mar 27	Oct 4
1998	Apr 4	Nov 6	Mar 22	Nov 6
1997	May 1	Oct 22	Apr 18	Oct 27
1996	Apr 24	Oct 31	Apr 7	Nov 1
1995	Apr 14	Sep 23	Apr 5	Nov 3
1994	Apr 8	Oct 25	Apr 8	Oct 26
1993	Apr 23	Oct 10	Apr 4	Oct 30
1992	Apr 23	no data	Apr 23	no data
1991	no data	Sep 19	no data	Oct 19
1990	May 1	Oct 11	Apr 13	Oct 22
1989	May 8	Sep 24	Apr 20	Oct 20
1988	Apr 29	no data	Apr 24	no data
1987	Apr 17	Oct 3	Apr 13	Oct 3
1986	Apr 23	Oct 14	Apr 23	Oct 15
1985	Apr 16	Sep 29	Apr 10	Oct 1
1984	Apr 30	Sep 26	Apr 17	Sep 29
1983	Apr 19	Sep 23	Apr 19	Sep 23
1982	Apr 23	Oct 7	Apr 21	Oct 12
1981	Apr 14	Sep 18	Mar 23	Oct 19
1980	May 9	Sep 26	Apr 16	Oct 12
1979	Apr 28	Oct 5	Apr 7	Oct 5
1978	Apr 21	no data	Mar 28	no data
1977	Apr 7	Oct 9	Apr 7	Oct 16
1976	May 7	Oct 6	Apr 2	Oct 6
1975	Apr 21	Oct 2	Apr 20	Oct 17
1974	Apr 18	Sep 29	Apr 16	Sep 29
1973	Apr 28	Oct 29	Apr 13	Nov 5
1972	Apr 25	Sep 30	Apr 9	Oct 19
1971	May 3	Oct 10	Apr 8	Oct 31
1970	May 3	Oct 10	Apr 21	Oct 17
1969	Apr 24	Oct 14	Mar 31	Oct 14
1968	Apr 25	Oct 4	Apr 25	Oct 5
1967	no data	Sep 29	no data	Oct 11
1966	May 2	Oct 1	Apr 22	Oct 11
1965	no data	Oct 12	no data	Oct 12
1964	Apr 10	Oct 5	Apr 9	Oct 9
1963	May 23	Oct 28	Mar 22	Oct 29
1962	Apr 17	Oct 24	Apr 16	Oct 24
1961	May 2	Sep 28	Apr 18	Oct 20
1960	May 1	Oct 20	Apr 11	Oct 20
1959	Apr 23	Oct 9	Apr 11	Oct 28
1958	Apr 29	no data	Apr 29	no data
1957	Apr 15	Oct 26	Apr 15	Oct 26
1956	Apr 24	Nov 8	Apr 24	Nov 9
1955	Apr 8	Oct 15	Apr 7	Oct 24
1954	May 4	Oct 28	May 4	Oct 30
1953	Apr 27	Oct 27	Apr 20	Oct 27
1952	no data	Oct 6	no data	Oct 6
1951	no data	Sep 28	no data	Oct 24

"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.