Frost history / Whiskeytown Rsvr, CA
Whiskeytown Rsvr, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00049621, 1964 to 2024, measured from daily minimum temperatures.
Elevation 1,295 ft, 40.612, -122.528. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 11 | Nov 27 |
| Earliest | Jan 3 (2015) | Oct 28 (1971) |
| Latest | Apr 28 (1967) | Dec 24 (1995) |
| Trend | 3.6 days earlier per decade | 1.5 days later per decade |
| Years with data | 45 | 47, 2 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 4 and the median first fall date is Dec 6.
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 | no data | none | no data | none |
| 2022 | Feb 24 | no data | none | no data |
| 2019 | no data | Nov 30 | no data | none |
| 2017 | Feb 28 | Dec 21 | Feb 27 | none |
| 2016 | Feb 1 | Dec 6 | none | Dec 17 |
| 2015 | Jan 3 | Nov 27 | Jan 2 | Nov 27 |
| 2014 | Feb 6 | no data | none | no data |
| 2013 | Mar 22 | Dec 4 | Feb 10 | Dec 4 |
| 2012 | no data | Dec 15 | no data | Dec 19 |
| 2010 | no data | Nov 24 | no data | Nov 24 |
| 2006 | Mar 12 | no data | Feb 20 | no data |
| 2005 | Feb 14 | Nov 29 | none | none |
| 2004 | Feb 10 | no data | Jan 5 | no data |
| 2003 | Apr 13 | Nov 24 | none | Dec 31 |
| 2002 | no data | Nov 5 | no data | none |
| 2001 | Apr 4 | Nov 29 | none | none |
| 2000 | Feb 12 | no data | none | no data |
| 1999 | Apr 11 | Dec 18 | Feb 15 | none |
| 1998 | Feb 22 | Dec 4 | none | Dec 6 |
| 1997 | Apr 17 | Dec 12 | Apr 11 | none |
| 1996 | Feb 28 | Dec 22 | none | Dec 22 |
| 1995 | Mar 25 | Dec 24 | none | none |
| 1994 | Mar 23 | Nov 3 | none | Nov 18 |
| 1993 | Feb 27 | Nov 16 | Feb 16 | Nov 23 |
| 1992 | Feb 16 | Nov 9 | none | Dec 5 |
| 1991 | Mar 26 | Nov 30 | Jan 30 | none |
| 1990 | Mar 15 | Nov 24 | Feb 18 | Dec 2 |
| 1989 | Apr 3 | Oct 29 | Mar 3 | none |
| 1988 | no data | Nov 18 | no data | Dec 26 |
| 1987 | Mar 29 | Nov 27 | Jan 18 | Dec 13 |
| 1986 | Feb 11 | Dec 12 | none | none |
| 1985 | Mar 28 | Nov 11 | Feb 5 | Nov 13 |
| 1984 | Feb 25 | Nov 26 | Jan 14 | Dec 25 |
| 1983 | Feb 26 | Dec 20 | none | Dec 21 |
| 1982 | Apr 7 | Nov 16 | Jan 23 | none |
| 1981 | Jan 31 | Nov 27 | none | none |
| 1980 | Jan 31 | Dec 5 | Jan 28 | none |
| 1979 | no data | Dec 22 | no data | none |
| 1978 | Feb 13 | Nov 11 | none | Nov 15 |
| 1977 | Mar 28 | Nov 19 | Jan 8 | Nov 21 |
| 1976 | Mar 25 | Nov 27 | Feb 5 | Dec 28 |
| 1975 | Apr 21 | Nov 18 | Feb 21 | Nov 29 |
| 1974 | Mar 11 | Dec 22 | Jan 10 | none |
| 1973 | Jan 29 | no data | Jan 8 | no data |
| 1972 | Mar 26 | Dec 3 | Feb 1 | Dec 5 |
| 1971 | Mar 6 | Oct 28 | Mar 1 | Oct 29 |
| 1970 | Jan 28 | Dec 19 | none | none |
| 1969 | Mar 12 | none | Jan 24 | none |
| 1968 | Feb 4 | Nov 15 | Feb 4 | Dec 20 |
| 1967 | Apr 28 | Dec 1 | none | Dec 13 |
| 1966 | Mar 17 | Nov 24 | Mar 4 | none |
| 1965 | Apr 8 | Dec 15 | Jan 1 | Dec 18 |
| 1964 | no data | Nov 15 | no data | none |
"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.