Frost history / Redding 12 Wnw, CA

Redding 12 Wnw, CA: frost dates by year

Last spring and first fall frost at NOAA station USW00004222, 2003 to 2024, measured from daily minimum temperatures.

Elevation 1,418 ft, 40.651, -122.607. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Mar 19	Nov 24
Earliest	Jan 13 (2005)	Nov 1 (2003)
Latest	Apr 17 (2018)	Dec 26 (2014)
Trend	4.5 days later per decade	2.5 days later per decade
Years with data	21	21

At 28°F (hard freeze) the median last spring date is Feb 23 and the median first fall date is Dec 4.

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	Mar 4	Nov 16	none	none
2023	Mar 24	Nov 24	Feb 23	none
2022	Apr 12	Nov 29	Feb 23	none
2021	Feb 27	Dec 10	none	none
2020	Feb 4	Nov 9	none	Nov 9
2019	Feb 23	Nov 26	none	none
2018	Apr 17	no data	Mar 2	no data
2017	Feb 28	Dec 3	Feb 27	Dec 21
2016	Feb 2	Dec 2	Jan 2	Dec 7
2015	Apr 6	Nov 16	Jan 2	Nov 25
2014	Feb 5	Dec 26	Feb 5	Dec 30
2013	Mar 22	Nov 22	Jan 14	Dec 3
2012	Mar 19	Nov 9	Mar 7	Dec 19
2011	Mar 20	Nov 10	Feb 26	Nov 19
2010	Apr 6	Nov 23	none	Nov 23
2009	Apr 5	Nov 16	Jan 27	Dec 5
2008	Mar 31	Dec 13	Mar 31	Dec 16
2007	Mar 1	Nov 30	Feb 1	Dec 11
2006	Mar 27	Nov 28	Mar 11	Nov 29
2005	Jan 13	Nov 28	none	Dec 17
2004	Feb 9	Nov 20	Jan 4	Dec 4
2003	no data	Nov 1	no data	Nov 22

"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.