Frost history / Balch Pwr House, CA
Balch Pwr House, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00040449, 1962 to 2020, measured from daily minimum temperatures.
Elevation 1,735 ft, 36.909, -119.088. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 12 | Dec 10 |
| Earliest | Jan 6 (1970) | Nov 9 (2020) |
| Latest | May 8 (1986) | Dec 30 (1989) |
| Trend | 0.5 days later per decade | little change (less than half a day per decade) |
| Years with data | 42, 3 with no freeze | 41, 2 with no freeze |
At 28°F (hard freeze) the median last spring date is Jan 20 and the median first fall date is Dec 18.
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 |
|---|---|---|---|---|
| 2020 | Feb 6 | Nov 9 | none | none |
| 2019 | Feb 23 | no data | Feb 11 | no data |
| 2018 | Mar 27 | Dec 29 | Mar 27 | none |
| 2017 | Mar 6 | Dec 6 | none | Dec 6 |
| 2015 | Apr 8 | no data | Jan 1 | no data |
| 2014 | no data | Dec 26 | no data | Dec 31 |
| 2013 | Feb 22 | Dec 4 | Jan 15 | Dec 5 |
| 2012 | Apr 6 | Dec 19 | Jan 17 | none |
| 2005 | Jan 12 | no data | none | no data |
| 2004 | no data | Nov 29 | no data | none |
| 2003 | none | Nov 22 | none | Dec 27 |
| 2002 | Mar 19 | Dec 18 | Jan 31 | none |
| 1999 | Apr 10 | Dec 10 | Feb 10 | none |
| 1998 | Apr 16 | Dec 6 | Feb 6 | Dec 21 |
| 1993 | Feb 20 | no data | Jan 4 | no data |
| 1992 | Jan 27 | Dec 12 | none | Dec 18 |
| 1991 | Mar 16 | Nov 30 | none | none |
| 1990 | Mar 12 | Dec 15 | Feb 19 | Dec 20 |
| 1989 | Feb 14 | Dec 30 | Feb 8 | none |
| 1988 | Mar 12 | Dec 23 | Jan 2 | Dec 26 |
| 1987 | Feb 28 | Dec 13 | Jan 17 | Dec 14 |
| 1986 | May 8 | Dec 28 | May 7 | none |
| 1985 | Mar 29 | Nov 13 | Feb 1 | Dec 11 |
| 1984 | Feb 17 | Dec 13 | none | Dec 17 |
| 1983 | Feb 7 | Nov 22 | none | none |
| 1982 | Apr 7 | Dec 8 | Jan 22 | none |
| 1981 | Mar 13 | none | none | none |
| 1980 | none | Dec 9 | none | none |
| 1979 | no data | Nov 20 | no data | none |
| 1978 | none | Nov 23 | none | Dec 6 |
| 1977 | Mar 17 | Nov 20 | Jan 14 | none |
| 1976 | Apr 16 | Nov 28 | Apr 2 | none |
| 1975 | Feb 22 | Nov 28 | Feb 17 | none |
| 1974 | Jan 27 | Dec 23 | Jan 3 | Dec 23 |
| 1973 | Mar 14 | none | Jan 7 | none |
| 1972 | Feb 3 | Dec 2 | Jan 4 | Dec 9 |
| 1971 | Mar 2 | no data | Jan 7 | no data |
| 1970 | Jan 6 | Dec 18 | none | none |
| 1969 | Mar 14 | Dec 28 | Jan 30 | Dec 28 |
| 1968 | Jan 30 | Dec 20 | Jan 29 | Dec 21 |
| 1967 | Apr 16 | Dec 13 | none | Dec 13 |
| 1966 | Mar 4 | Dec 27 | Jan 2 | none |
| 1965 | Apr 10 | Dec 15 | Jan 1 | Dec 17 |
| 1964 | Mar 8 | Nov 14 | none | none |
| 1963 | Mar 18 | Dec 10 | Jan 14 | none |
| 1962 | no data | Dec 23 | no data | Dec 27 |
"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.