Frost history / San Gregorio 2 Se, CA
San Gregorio 2 Se, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00047807, 1954 to 2007, measured from daily minimum temperatures.
Elevation 275 ft, 37.312, -122.362. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 13 | Nov 19 |
| Earliest | Jan 4 (1993) | Oct 7 (1997) |
| Latest | Jun 13 (2001) | Dec 30 (1982) |
| Trend | little change (less than half a day per decade) | 0.8 days earlier per decade |
| Years with data | 51, 2 with no freeze | 50, 5 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 3 and the median first fall date is Dec 10.
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 |
|---|---|---|---|---|
| 2007 | May 5 | no data | Jan 18 | no data |
| 2006 | Mar 11 | Nov 12 | none | Dec 18 |
| 2005 | Apr 14 | Nov 27 | none | none |
| 2004 | Feb 12 | Nov 22 | none | Dec 4 |
| 2003 | May 17 | Nov 21 | May 15 | none |
| 2002 | Mar 19 | Nov 1 | Jan 30 | Dec 19 |
| 2001 | Jun 13 | Nov 27 | Feb 8 | Dec 7 |
| 1998 | Mar 29 | Dec 5 | none | Dec 16 |
| 1997 | Mar 13 | Oct 7 | none | Dec 11 |
| 1996 | Feb 26 | Oct 26 | none | none |
| 1995 | Mar 26 | none | none | none |
| 1994 | Feb 14 | Nov 3 | none | none |
| 1993 | Jan 4 | Nov 23 | none | Nov 24 |
| 1992 | Jan 23 | Nov 11 | none | none |
| 1991 | Apr 12 | Nov 16 | Jan 5 | none |
| 1990 | Mar 10 | Nov 24 | Feb 15 | Dec 21 |
| 1989 | Mar 4 | Dec 17 | none | none |
| 1988 | Apr 8 | Nov 18 | none | none |
| 1987 | Feb 26 | Dec 23 | Feb 26 | none |
| 1986 | Apr 30 | Nov 26 | none | none |
| 1985 | Feb 10 | Nov 12 | none | Dec 12 |
| 1984 | Feb 22 | Dec 23 | none | none |
| 1983 | Jan 20 | none | none | none |
| 1982 | Feb 24 | Dec 30 | none | none |
| 1981 | none | none | none | none |
| 1980 | Mar 12 | Nov 13 | none | none |
| 1979 | Feb 4 | Nov 21 | Feb 3 | none |
| 1978 | none | Nov 10 | none | Dec 8 |
| 1977 | Apr 22 | Nov 19 | none | none |
| 1976 | Apr 2 | Oct 28 | Jan 25 | none |
| 1975 | Mar 29 | Oct 23 | Jan 30 | none |
| 1974 | Feb 23 | Dec 23 | none | Dec 23 |
| 1973 | Jan 26 | Nov 4 | Jan 6 | none |
| 1972 | May 3 | Dec 5 | Mar 26 | Dec 5 |
| 1971 | Mar 31 | Oct 25 | Mar 2 | none |
| 1970 | Apr 29 | none | none | none |
| 1969 | Mar 14 | none | none | none |
| 1968 | Apr 22 | Nov 14 | Jan 7 | Dec 20 |
| 1967 | Mar 8 | Dec 6 | none | Dec 17 |
| 1966 | Mar 20 | Dec 26 | Mar 3 | Dec 27 |
| 1965 | Feb 16 | Dec 16 | none | Dec 17 |
| 1964 | May 15 | Nov 14 | Mar 7 | none |
| 1963 | Mar 12 | no data | Jan 20 | no data |
| 1962 | Mar 13 | Nov 29 | Feb 27 | Nov 29 |
| 1961 | Feb 26 | Nov 16 | Jan 5 | Nov 17 |
| 1960 | Apr 17 | Dec 8 | Jan 4 | none |
| 1959 | Feb 12 | Nov 11 | none | none |
| 1958 | Mar 11 | Nov 16 | none | Nov 16 |
| 1957 | Mar 24 | Dec 1 | Jan 31 | none |
| 1956 | Mar 27 | Oct 24 | Mar 6 | Dec 7 |
| 1955 | Apr 28 | Oct 31 | Feb 4 | Nov 12 |
| 1954 | no data | Nov 29 | no data | Nov 30 |
"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.