Frost history / Dobbins 1 S, CA
Dobbins 1 S, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00042456, 1970 to 2008, measured from daily minimum temperatures.
Elevation 1,640 ft, 39.358, -121.201. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 18 | Nov 7 |
| Earliest | Mar 4 (2004) | Oct 12 (1981) |
| Latest | May 20 (1974) | Dec 16 (1995) |
| Trend | 2.8 days earlier per decade | 5.9 days later per decade |
| Years with data | 16 | 20 |
At 28°F (hard freeze) the median last spring date is Feb 23 and the median first fall date is Nov 28.
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 |
|---|---|---|---|---|
| 2008 | Apr 30 | no data | Apr 21 | no data |
| 2007 | Apr 20 | Nov 8 | Feb 3 | Dec 1 |
| 2006 | no data | Oct 30 | no data | Nov 23 |
| 2005 | Apr 14 | Nov 26 | Jan 15 | Nov 27 |
| 2004 | Mar 4 | Nov 5 | Feb 12 | Nov 28 |
| 2003 | Apr 15 | no data | Feb 9 | no data |
| 2001 | no data | Nov 24 | no data | Dec 11 |
| 2000 | May 11 | Nov 9 | Feb 24 | Nov 12 |
| 1999 | May 15 | no data | Apr 9 | no data |
| 1998 | Apr 17 | Nov 12 | Mar 7 | Dec 5 |
| 1997 | no data | Dec 2 | no data | Dec 12 |
| 1996 | Mar 29 | no data | Mar 7 | no data |
| 1995 | no data | Dec 16 | no data | Dec 17 |
| 1994 | no data | Nov 2 | no data | Nov 13 |
| 1990 | Mar 13 | Nov 2 | Mar 13 | Nov 23 |
| 1989 | no data | Nov 8 | no data | Nov 28 |
| 1982 | Apr 9 | Nov 9 | Feb 23 | Nov 13 |
| 1981 | Apr 12 | Oct 12 | Feb 12 | none |
| 1979 | Apr 19 | no data | Feb 3 | no data |
| 1977 | no data | Nov 6 | no data | Nov 19 |
| 1975 | no data | Oct 28 | no data | Nov 17 |
| 1974 | May 20 | Nov 9 | Apr 28 | Dec 10 |
| 1973 | Apr 19 | no data | Jan 28 | no data |
| 1972 | Apr 29 | Oct 29 | Apr 13 | Dec 1 |
| 1971 | no data | Oct 17 | no data | Oct 29 |
| 1970 | no data | Oct 27 | no data | Dec 24 |
"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.