Frost history / Mitchell Caverns, CA
Mitchell Caverns, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00045721, 1958 to 2010, measured from daily minimum temperatures.
Elevation 4,350 ft, 34.944, -115.547. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 31 | Nov 23 |
| Earliest | Feb 11 (1978) | Oct 28 (1989) |
| Latest | May 31 (1991) | Dec 25 (1962) |
| Trend | little change (less than half a day per decade) | little change (less than half a day per decade) |
| Years with data | 46 | 50, 1 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 17 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 |
|---|---|---|---|---|
| 2010 | Apr 22 | Nov 26 | Mar 10 | Nov 29 |
| 2009 | Apr 16 | Oct 28 | Feb 11 | Dec 8 |
| 2008 | Mar 17 | Dec 14 | Feb 5 | Dec 14 |
| 2007 | no data | Dec 2 | no data | Dec 22 |
| 2006 | Mar 21 | no data | Mar 13 | no data |
| 2005 | no data | Nov 27 | no data | none |
| 2004 | Feb 28 | Nov 21 | Jan 4 | Nov 29 |
| 2003 | Apr 15 | Nov 23 | none | Dec 27 |
| 2002 | Mar 18 | Dec 18 | Jan 31 | none |
| 2001 | Apr 14 | no data | Feb 14 | no data |
| 2000 | Mar 6 | Nov 12 | none | none |
| 1999 | Apr 10 | Dec 8 | Apr 8 | none |
| 1998 | Apr 2 | Nov 10 | none | Dec 6 |
| 1997 | Mar 1 | Dec 9 | Jan 14 | Dec 26 |
| 1996 | Mar 12 | Nov 23 | Feb 28 | Nov 23 |
| 1995 | May 1 | Dec 22 | none | Dec 22 |
| 1994 | Feb 23 | no data | Feb 1 | no data |
| 1993 | May 4 | Nov 27 | Jan 12 | Dec 23 |
| 1992 | no data | Nov 3 | no data | Dec 5 |
| 1991 | May 31 | Oct 29 | May 31 | Nov 30 |
| 1990 | Mar 31 | Nov 6 | Mar 30 | Dec 20 |
| 1989 | May 9 | Oct 28 | Feb 13 | Oct 28 |
| 1988 | Mar 30 | Nov 15 | Jan 18 | Dec 8 |
| 1987 | Mar 22 | Nov 15 | Mar 22 | Dec 13 |
| 1986 | Apr 13 | Nov 23 | Feb 11 | none |
| 1985 | Mar 29 | Nov 12 | Mar 4 | Nov 13 |
| 1984 | Apr 1 | Nov 26 | Feb 17 | Dec 13 |
| 1983 | Apr 12 | Nov 21 | none | Nov 23 |
| 1982 | Apr 7 | Dec 1 | Apr 4 | Dec 24 |
| 1981 | Mar 6 | Nov 26 | none | none |
| 1980 | no data | none | no data | none |
| 1979 | Mar 29 | Nov 19 | Feb 5 | Nov 19 |
| 1978 | Feb 11 | Nov 12 | none | Dec 5 |
| 1977 | May 24 | Nov 19 | Jan 10 | none |
| 1976 | Apr 16 | Nov 27 | Mar 27 | Nov 28 |
| 1975 | Apr 8 | Nov 27 | Mar 28 | Nov 29 |
| 1974 | Feb 21 | Dec 23 | Jan 6 | Dec 23 |
| 1973 | Mar 25 | Nov 24 | Jan 21 | Nov 25 |
| 1972 | no data | Oct 30 | no data | Oct 31 |
| 1971 | Apr 26 | Oct 29 | Mar 2 | Oct 29 |
| 1970 | Apr 28 | Dec 2 | Jan 29 | Dec 24 |
| 1969 | Mar 14 | Nov 18 | Feb 23 | none |
| 1968 | Apr 22 | Nov 25 | Jan 28 | Dec 18 |
| 1967 | Apr 29 | Nov 29 | Apr 12 | Nov 29 |
| 1966 | Mar 4 | Dec 8 | Mar 3 | Dec 8 |
| 1965 | no data | Nov 26 | no data | none |
| 1964 | May 7 | Nov 14 | May 5 | Nov 15 |
| 1963 | Apr 21 | Dec 11 | Jan 20 | none |
| 1962 | Mar 23 | Dec 25 | Mar 23 | Dec 25 |
| 1961 | Mar 27 | Nov 13 | Mar 26 | Dec 9 |
| 1960 | Feb 27 | Nov 15 | Feb 24 | Dec 6 |
| 1959 | Feb 22 | Oct 31 | Feb 9 | Dec 31 |
| 1958 | no data | Nov 15 | no data | Nov 17 |
"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.