Sidney 1SSE, IA: frost dates by year

Last spring and first fall frost at NOAA station USC00137669, 1951 to 2017, measured from daily minimum temperatures.

Elevation 1,140 ft, 40.736, -95.643. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 17	Oct 16
Earliest	Mar 23 (1981)	Sep 18 (1991)
Latest	May 15 (1959)	Nov 6 (1998)
Trend	1.0 days earlier per decade	1.0 days later per decade
Years with data	64	60

At 28°F (hard freeze) the median last spring date is Apr 8 and the median first fall date is Oct 31.

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

"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.