Frost history / Morro Bay Fire Dept, CA
Morro Bay Fire Dept, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00045866, 1959 to 2015, measured from daily minimum temperatures.
Elevation 118 ft, 35.367, -120.845. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 6 | Dec 9 |
| Earliest | Jan 1 (1965) | Nov 14 (1992) |
| Latest | Apr 5 (1993) | Dec 31 (1959) |
| Trend | 4.0 days later per decade | 0.9 days earlier per decade |
| Years with data | 52, 31 with no freeze | 51, 30 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 24 and the median first fall date is Dec 17.
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 | none | none | none | none |
| 2014 | none | none | none | none |
| 2013 | none | Dec 9 | none | none |
| 2012 | no data | none | no data | none |
| 2011 | none | no data | none | no data |
| 2010 | none | no data | none | no data |
| 2009 | none | none | none | none |
| 2006 | none | Dec 19 | none | none |
| 2005 | none | none | none | none |
| 2004 | none | none | none | none |
| 2003 | none | none | none | none |
| 2002 | Jan 29 | none | none | none |
| 2001 | Feb 13 | none | none | none |
| 2000 | none | none | none | none |
| 1999 | none | none | none | none |
| 1998 | none | Dec 20 | none | none |
| 1997 | none | none | none | none |
| 1996 | none | none | none | none |
| 1995 | none | none | none | none |
| 1994 | none | none | none | none |
| 1993 | Apr 5 | Dec 5 | Feb 26 | none |
| 1992 | Jan 23 | Nov 14 | none | Dec 17 |
| 1991 | Jan 29 | Nov 16 | none | none |
| 1990 | Mar 12 | Dec 15 | Feb 14 | Dec 21 |
| 1989 | Feb 6 | Nov 28 | none | none |
| 1988 | Jan 19 | Dec 25 | none | Dec 26 |
| 1987 | Mar 21 | Dec 12 | Feb 24 | Dec 13 |
| 1986 | none | none | none | none |
| 1984 | none | no data | none | no data |
| 1983 | none | none | none | none |
| 1982 | none | none | none | none |
| 1981 | none | none | none | none |
| 1980 | none | none | none | none |
| 1979 | Jan 30 | Nov 20 | Jan 29 | none |
| 1978 | none | Dec 7 | none | none |
| 1977 | Mar 2 | none | none | none |
| 1976 | Jan 4 | none | none | none |
| 1975 | Feb 23 | Nov 29 | none | none |
| 1974 | Feb 15 | Dec 24 | none | none |
| 1973 | none | none | none | none |
| 1972 | none | Dec 9 | none | none |
| 1971 | none | none | none | none |
| 1970 | none | none | none | none |
| 1969 | Mar 4 | none | Mar 4 | none |
| 1968 | none | none | none | none |
| 1967 | none | Dec 14 | none | Dec 15 |
| 1966 | Jan 21 | none | none | none |
| 1965 | Jan 1 | none | none | none |
| 1964 | Mar 8 | Nov 20 | none | none |
| 1963 | Jan 25 | Dec 1 | none | none |
| 1962 | Feb 28 | Dec 27 | none | none |
| 1961 | none | none | none | none |
| 1960 | Jan 5 | Dec 7 | none | none |
| 1959 | no data | Dec 31 | no data | none |
"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.