Frost history / Big Bar 4 E, CA
Big Bar 4 E, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00040738, 1952 to 2015, measured from daily minimum temperatures.
Elevation 1,253 ft, 40.741, -123.208. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 24 | Oct 27 |
| Earliest | Mar 7 (2003) | Sep 24 (1958) |
| Latest | May 23 (1953) | Dec 5 (1998) |
| Trend | 4.8 days earlier per decade | 2.2 days later per decade |
| Years with data | 38 | 42 |
At 28°F (hard freeze) the median last spring date is Mar 20 and the median first fall date is Nov 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 |
|---|---|---|---|---|
| 2015 | Apr 5 | Nov 6 | Feb 25 | Nov 24 |
| 2014 | Apr 5 | Nov 16 | Feb 6 | Dec 31 |
| 2013 | Apr 18 | Oct 16 | Feb 28 | Nov 4 |
| 2011 | no data | Oct 26 | no data | Dec 4 |
| 2010 | May 7 | no data | Mar 9 | no data |
| 2009 | Apr 16 | Oct 28 | Apr 16 | Dec 6 |
| 2008 | Apr 22 | Oct 11 | Apr 21 | Oct 12 |
| 2007 | Apr 21 | Nov 21 | Feb 4 | Nov 23 |
| 2006 | Mar 19 | Oct 25 | Feb 23 | Nov 29 |
| 2005 | Apr 14 | Nov 27 | none | Dec 17 |
| 2004 | Apr 3 | Nov 21 | Feb 13 | Nov 21 |
| 2003 | Mar 7 | Nov 1 | Feb 12 | Nov 1 |
| 2002 | May 11 | Oct 13 | Mar 20 | Oct 30 |
| 2001 | Apr 15 | Nov 8 | Apr 6 | none |
| 2000 | Mar 23 | Oct 23 | none | Nov 11 |
| 1999 | Apr 29 | Oct 17 | Apr 7 | none |
| 1998 | Apr 13 | Dec 5 | Mar 29 | Dec 19 |
| 1997 | May 1 | Oct 25 | Apr 2 | Oct 25 |
| 1996 | May 9 | Nov 10 | Mar 26 | none |
| 1981 | May 5 | Nov 27 | Feb 14 | none |
| 1980 | no data | Nov 13 | no data | Nov 13 |
| 1979 | Apr 18 | no data | Feb 4 | no data |
| 1978 | Mar 13 | Oct 30 | none | Oct 31 |
| 1977 | Apr 19 | no data | Mar 31 | no data |
| 1976 | Apr 27 | no data | Apr 1 | no data |
| 1975 | May 5 | Nov 9 | Apr 1 | Nov 17 |
| 1973 | Apr 20 | Oct 4 | Apr 18 | Nov 19 |
| 1972 | Apr 30 | Oct 25 | Apr 19 | Oct 31 |
| 1971 | May 21 | Oct 16 | Apr 21 | Oct 17 |
| 1970 | no data | Sep 25 | no data | Nov 28 |
| 1969 | May 4 | Oct 4 | Mar 19 | Nov 18 |
| 1968 | no data | Oct 8 | no data | Nov 28 |
| 1966 | Apr 28 | Oct 13 | Apr 28 | Oct 14 |
| 1965 | May 7 | Oct 16 | Feb 25 | Dec 14 |
| 1964 | no data | Nov 14 | no data | Nov 16 |
| 1963 | no data | Nov 21 | no data | Dec 11 |
| 1962 | May 20 | Nov 28 | Mar 14 | Dec 24 |
| 1961 | May 4 | Oct 8 | Mar 5 | Oct 8 |
| 1960 | Apr 22 | Oct 10 | Mar 1 | Dec 6 |
| 1959 | May 18 | Oct 29 | Feb 9 | Oct 29 |
| 1958 | no data | Sep 24 | no data | Nov 16 |
| 1957 | Apr 8 | Nov 2 | Apr 7 | Nov 3 |
| 1956 | May 12 | Oct 24 | Mar 16 | Nov 15 |
| 1955 | May 14 | Oct 31 | Apr 5 | Dec 29 |
| 1953 | May 23 | Oct 22 | Apr 8 | Dec 22 |
| 1952 | no data | Nov 2 | no data | Nov 22 |
"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.