Frost history / Bowman Dam, CA
Bowman Dam, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00041018, 1951 to 2016, measured from daily minimum temperatures.
Elevation 5,385 ft, 39.454, -120.656. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 24 | Oct 15 |
| Earliest | Apr 25 (2015) | Sep 9 (1985) |
| Latest | Jul 18 (1987) | Nov 26 (1976) |
| Trend | 0.8 days earlier per decade | little change (less than half a day per decade) |
| Years with data | 37 | 38 |
At 28°F (hard freeze) the median last spring date is May 6 and the median first fall date is Nov 2.
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 |
|---|---|---|---|---|
| 2016 | May 21 | Oct 2 | Mar 29 | Nov 17 |
| 2015 | Apr 25 | Nov 5 | Apr 15 | Nov 11 |
| 1996 | no data | Oct 18 | no data | Oct 19 |
| 1987 | Jul 18 | Nov 2 | May 2 | Nov 2 |
| 1986 | May 22 | Sep 14 | May 8 | Sep 25 |
| 1985 | Jun 2 | Sep 9 | Jun 1 | Oct 9 |
| 1984 | Jun 6 | Oct 1 | May 6 | Oct 16 |
| 1983 | May 16 | Nov 7 | May 10 | Nov 8 |
| 1981 | May 19 | Oct 5 | Apr 12 | Oct 11 |
| 1980 | Jun 6 | Oct 14 | May 25 | Oct 26 |
| 1979 | Jun 17 | Oct 20 | May 9 | Oct 21 |
| 1978 | May 25 | Oct 30 | Apr 22 | Nov 10 |
| 1977 | May 24 | Oct 29 | May 24 | Nov 19 |
| 1976 | Apr 29 | Nov 26 | Apr 26 | Nov 27 |
| 1975 | Jun 25 | Oct 12 | May 20 | Oct 23 |
| 1974 | May 20 | Nov 3 | May 18 | Nov 9 |
| 1973 | May 5 | Oct 9 | May 4 | Nov 3 |
| 1972 | Jun 10 | Oct 28 | Apr 25 | Oct 28 |
| 1971 | Jun 1 | Sep 27 | May 31 | Sep 30 |
| 1970 | May 13 | Oct 7 | May 12 | Oct 26 |
| 1969 | May 4 | Oct 12 | May 4 | Nov 17 |
| 1968 | May 22 | Oct 15 | May 14 | Oct 15 |
| 1967 | Jun 2 | Oct 3 | May 12 | Nov 28 |
| 1966 | Jun 2 | Oct 13 | Apr 20 | Nov 22 |
| 1965 | May 22 | Oct 16 | May 6 | Nov 21 |
| 1964 | Jun 9 | Nov 1 | May 6 | Nov 10 |
| 1963 | Jun 3 | Nov 4 | Apr 22 | Nov 7 |
| 1962 | May 28 | Oct 14 | May 28 | Nov 17 |
| 1961 | May 23 | Oct 8 | May 12 | Oct 8 |
| 1960 | May 25 | no data | May 23 | no data |
| 1959 | May 23 | Sep 15 | May 3 | Oct 30 |
| 1958 | May 15 | Nov 1 | Apr 26 | Nov 15 |
| 1957 | May 20 | Oct 4 | Apr 20 | Nov 2 |
| 1956 | May 12 | Oct 23 | Apr 15 | Oct 23 |
| 1955 | Jun 1 | Oct 31 | Jun 1 | Nov 1 |
| 1954 | Jun 9 | Oct 24 | Apr 2 | Oct 24 |
| 1953 | no data | Oct 19 | no data | Oct 22 |
| 1952 | Jun 12 | Sep 10 | Apr 29 | Nov 14 |
| 1951 | May 14 | Oct 24 | May 14 | Nov 11 |
"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.