Frost history / Twitchell Dam, CA
Twitchell Dam, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00049111, 1962 to 2025, measured from daily minimum temperatures.
Elevation 582 ft, 34.988, -120.321. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 9 | Nov 30 |
| Earliest | Jan 3 (1974) | Oct 5 (2009) |
| Latest | May 16 (2015) | Dec 27 (2011) |
| Trend | 0.9 days later per decade | 2.4 days earlier per decade |
| Years with data | 42, 5 with no freeze | 44, 8 with no freeze |
At 28°F (hard freeze) the median last spring date is Jan 25 and the median first fall date is Dec 11.
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 |
|---|---|---|---|---|
| 2025 | Feb 11 | none | none | none |
| 2024 | Feb 3 | Nov 20 | none | none |
| 2023 | Apr 5 | none | none | none |
| 2022 | Mar 13 | Nov 3 | Feb 24 | none |
| 2021 | Mar 16 | Dec 19 | Jan 26 | none |
| 2020 | Feb 4 | Dec 11 | none | Dec 11 |
| 2019 | Mar 9 | Nov 5 | Jan 3 | none |
| 2018 | Apr 29 | Nov 11 | none | none |
| 2016 | no data | Nov 24 | no data | Nov 24 |
| 2015 | May 16 | Nov 3 | Mar 8 | Nov 4 |
| 2014 | Mar 31 | Nov 28 | Jan 3 | Nov 28 |
| 2013 | Feb 7 | Dec 3 | none | Dec 19 |
| 2012 | Jan 19 | Dec 21 | Jan 19 | none |
| 2011 | Jan 9 | Dec 27 | none | none |
| 2010 | Apr 4 | no data | none | no data |
| 2009 | Apr 28 | Oct 5 | none | Nov 18 |
| 2008 | Feb 16 | Oct 11 | none | Dec 15 |
| 2007 | Feb 5 | Nov 27 | Jan 15 | Dec 15 |
| 2006 | Feb 21 | Dec 19 | none | none |
| 2005 | none | no data | none | no data |
| 2003 | Apr 4 | Dec 27 | none | none |
| 2002 | Mar 19 | no data | Feb 5 | no data |
| 2001 | no data | Dec 10 | no data | none |
| 1992 | no data | Dec 20 | no data | none |
| 1991 | Mar 16 | Nov 14 | Jan 24 | Dec 26 |
| 1990 | Mar 13 | Nov 25 | Feb 16 | Dec 16 |
| 1989 | Feb 16 | Nov 29 | Jan 14 | Dec 13 |
| 1988 | Mar 10 | no data | none | no data |
| 1987 | Mar 22 | Nov 27 | Feb 24 | Nov 27 |
| 1986 | Feb 10 | Dec 9 | none | none |
| 1985 | Mar 26 | Nov 13 | none | Dec 13 |
| 1984 | none | Dec 15 | none | Dec 17 |
| 1983 | none | none | none | none |
| 1982 | Jan 19 | none | none | none |
| 1981 | Feb 26 | none | none | none |
| 1980 | no data | none | no data | none |
| 1979 | Feb 9 | Nov 21 | Jan 29 | none |
| 1978 | none | Dec 7 | none | Dec 7 |
| 1977 | Apr 1 | none | none | none |
| 1976 | no data | Dec 9 | no data | Dec 11 |
| 1975 | no data | Nov 18 | no data | Nov 29 |
| 1974 | Jan 3 | Nov 30 | Jan 3 | none |
| 1972 | no data | Dec 2 | no data | Dec 2 |
| 1969 | Jan 30 | none | none | none |
| 1967 | none | no data | none | no data |
| 1966 | Mar 3 | no data | Jan 22 | no data |
| 1965 | May 7 | Dec 15 | Feb 13 | Dec 23 |
| 1964 | May 3 | Nov 14 | Mar 7 | Nov 20 |
| 1963 | Jan 23 | Dec 11 | Jan 23 | none |
| 1962 | no data | Dec 27 | no data | Dec 28 |
"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.