Frost history / Richardson Gr Sp, CA
Richardson Gr Sp, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00047404, 1962 to 2010, measured from daily minimum temperatures.
Elevation 503 ft, 40.026, -123.793. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 13 | Nov 28 |
| Earliest | Jan 5 (2000) | Oct 28 (1971) |
| Latest | Jul 3 (2003) | Dec 28 (2000) |
| Trend | 6.3 days later per decade | 1.2 days earlier per decade |
| Years with data | 44, 2 with no freeze | 42, 6 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 3 and the median first fall date is Dec 12.
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 | none | no data | none | no data |
| 2009 | Apr 5 | Dec 6 | Mar 10 | Dec 8 |
| 2005 | no data | none | no data | none |
| 2004 | May 15 | no data | May 1 | no data |
| 2003 | Jul 3 | Nov 22 | Apr 2 | none |
| 2002 | Apr 2 | Oct 31 | Apr 2 | none |
| 2001 | Apr 6 | none | Feb 14 | none |
| 2000 | Jan 5 | Dec 28 | none | none |
| 1999 | Apr 1 | no data | none | no data |
| 1998 | Mar 6 | Dec 5 | none | Dec 20 |
| 1997 | Mar 13 | Dec 19 | Jan 15 | none |
| 1996 | Mar 28 | none | none | none |
| 1995 | Feb 16 | none | none | none |
| 1994 | Mar 15 | Nov 3 | none | none |
| 1993 | Feb 28 | Nov 7 | none | Nov 24 |
| 1992 | Feb 7 | no data | none | no data |
| 1991 | Apr 11 | Nov 16 | Jan 23 | Nov 30 |
| 1990 | Mar 13 | Nov 27 | Feb 18 | Dec 20 |
| 1989 | Mar 3 | Nov 28 | Feb 9 | Dec 12 |
| 1988 | Mar 13 | Dec 15 | Feb 7 | Dec 15 |
| 1987 | Feb 28 | Nov 26 | Jan 22 | Dec 13 |
| 1986 | no data | Nov 26 | no data | none |
| 1985 | Mar 22 | Nov 11 | none | Nov 13 |
| 1984 | May 6 | Dec 14 | none | none |
| 1983 | Jan 15 | Dec 22 | none | Dec 22 |
| 1982 | Apr 16 | Dec 8 | Feb 6 | none |
| 1981 | none | none | none | none |
| 1980 | Feb 5 | Nov 13 | Jan 31 | none |
| 1979 | Feb 4 | Nov 21 | Feb 4 | none |
| 1978 | Feb 12 | Nov 1 | none | Nov 10 |
| 1977 | Mar 31 | Nov 18 | Jan 10 | Nov 19 |
| 1976 | Apr 3 | Nov 28 | Feb 14 | Nov 28 |
| 1975 | Mar 29 | Nov 17 | Feb 1 | Dec 31 |
| 1974 | Mar 10 | Nov 30 | Jan 11 | Dec 23 |
| 1973 | Jan 28 | none | Jan 5 | none |
| 1972 | Mar 26 | Dec 3 | Feb 3 | Dec 5 |
| 1971 | Mar 6 | Oct 28 | Feb 27 | Oct 28 |
| 1970 | Feb 23 | Dec 19 | Jan 5 | none |
| 1969 | Mar 12 | Nov 17 | Jan 10 | none |
| 1968 | Jan 29 | Dec 19 | Jan 4 | Dec 20 |
| 1967 | Mar 12 | Nov 26 | none | Dec 13 |
| 1966 | Mar 17 | Dec 26 | Jan 20 | none |
| 1965 | Mar 19 | Dec 13 | none | Dec 16 |
| 1964 | Mar 24 | Nov 15 | none | Nov 15 |
| 1963 | Mar 13 | Dec 14 | Jan 21 | none |
| 1962 | Mar 14 | Nov 29 | Feb 28 | Dec 25 |
"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.