Redlands, CA: frost dates by year

Last spring and first fall frost at NOAA station USC00047306, 1951 to 2014, measured from daily minimum temperatures.

Elevation 1,410 ft, 34.037, -117.195. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Feb 12	Dec 11
Earliest	Jan 1 (1961)	Oct 30 (1971)
Latest	Apr 10 (1953)	Dec 28 (1954)
Trend	3.9 days earlier per decade	0.9 days later per decade
Years with data	58, 13 with no freeze	58, 10 with no freeze

At 28°F (hard freeze) the median last spring date is Jan 17 and the median first fall date is Dec 12.

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
2014	none	none	none	none
2013	Feb 12	Dec 9	Jan 14	none
2012	none	Dec 20	none	none
2011	Feb 27	Dec 6	none	none
2010	none	Nov 26	none	none
2009	Feb 11	Dec 8	none	none
2008	none	Dec 14	none	none
2007	Mar 1	Dec 22	Jan 16	none
2005	no data	none	no data	none
2004	Jan 4	Nov 30	none	none
2003	none	Dec 16	none	none
2002	Feb 1	Dec 19	none	none
2001	Jan 17	none	none	none
2000	none	none	none	none
1999	Feb 12	none	none	none
1998	Jan 6	Dec 7	none	Dec 22
1997	none	no data	none	no data
1996	Feb 27	no data	none	no data
1995	none	none	none	none
1994	none	Nov 20	none	none
1993	Jan 4	none	none	none
1992	none	Dec 20	none	none
1991	none	none	none	none
1990	Mar 13	Dec 21	none	Dec 22
1989	Feb 7	Dec 12	Feb 7	none
1988	Jan 20	Dec 26	none	none
1987	Feb 27	Dec 15	none	Dec 26
1986	no data	none	no data	none
1985	Mar 3	Dec 10	Feb 1	none
1984	none	Dec 15	none	none
1983	Jan 21	Nov 22	Jan 2	Dec 5
1982	no data	Nov 7	no data	Dec 26
1981	Feb 5	Dec 23	Jan 31	none
1980	no data	Nov 18	no data	none
1979	Feb 4	Nov 21	Jan 29	Nov 21
1978	none	Dec 7	none	Dec 7
1977	Jan 10	no data	none	no data
1976	Mar 7	no data	Jan 3	no data
1975	Feb 18	no data	Jan 29	no data
1974	Mar 4	Dec 24	Jan 3	Dec 24
1973	no data	Nov 25	no data	none
1972	Feb 3	Dec 5	Feb 3	Dec 9
1971	Feb 27	Oct 30	Jan 7	Oct 30
1970	Jan 29	Dec 23	Jan 6	none
1969	Feb 1	Dec 27	none	none
1968	Jan 30	Dec 18	none	Dec 21
1967	Jan 8	Dec 13	none	Dec 14
1966	Mar 4	Dec 27	none	none
1965	Feb 12	Dec 18	Feb 12	none
1964	Feb 27	Nov 14	none	none
1963	Mar 18	Dec 12	Jan 14	none
1962	Mar 14	Dec 25	Jan 11	none
1961	Jan 1	Dec 13	none	none
1960	Jan 18	Dec 8	Jan 17	Dec 8
1959	Feb 9	none	none	none
1958	Mar 3	Nov 17	none	Nov 17
1957	Feb 1	Nov 30	Jan 28	none
1956	Mar 13	Nov 21	Feb 17	Dec 9
1955	Feb 24	Dec 16	Feb 5	none
1954	Mar 16	Dec 28	Jan 3	Dec 28
1953	Apr 10	Nov 19	Feb 22	Dec 24
1952	Mar 9	Nov 25	Jan 4	none
1951	Feb 28	Dec 6	none	Dec 8

"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.