Frost history / Newark, CA
Newark, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00046144, 1951 to 2020, measured from daily minimum temperatures.
Elevation 10 ft, 37.515, -122.032. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jan 20 | Dec 17 |
| Earliest | Jan 1 (1991) | Nov 17 (1961) |
| Latest | Mar 19 (2018) | Dec 29 (2003) |
| Trend | 1.4 days earlier per decade | 0.9 days later per decade |
| Years with data | 60, 30 with no freeze | 58, 29 with no freeze |
At 28°F (hard freeze) the median last spring date is Jan 10 and the median first fall date is Dec 21.
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 |
|---|---|---|---|---|
| 2020 | Feb 6 | none | none | none |
| 2019 | none | Nov 28 | none | none |
| 2018 | Mar 19 | none | none | none |
| 2017 | none | none | none | none |
| 2016 | none | none | none | none |
| 2015 | none | none | none | none |
| 2014 | none | none | none | none |
| 2013 | Jan 22 | Dec 9 | none | none |
| 2012 | Jan 18 | none | none | none |
| 2011 | Jan 20 | none | none | none |
| 2010 | none | none | none | none |
| 2009 | Jan 4 | Dec 8 | none | none |
| 2008 | none | Dec 20 | none | none |
| 2007 | Jan 15 | none | none | none |
| 2006 | none | Dec 19 | none | none |
| 2005 | none | none | none | none |
| 2004 | Jan 4 | no data | none | no data |
| 2003 | none | Dec 29 | none | none |
| 2002 | none | none | none | none |
| 2001 | none | none | none | none |
| 2000 | none | none | none | none |
| 1999 | Jan 27 | none | none | none |
| 1998 | none | Dec 21 | none | Dec 21 |
| 1997 | Jan 14 | Dec 26 | none | none |
| 1996 | none | none | none | none |
| 1995 | none | none | none | none |
| 1994 | none | none | none | none |
| 1993 | Jan 6 | Dec 19 | Jan 4 | Dec 21 |
| 1992 | Jan 24 | Dec 18 | none | none |
| 1991 | Jan 1 | none | none | none |
| 1990 | Feb 16 | Dec 20 | none | Dec 21 |
| 1989 | Feb 8 | none | Feb 7 | none |
| 1988 | none | Dec 29 | none | none |
| 1987 | none | Dec 16 | none | none |
| 1986 | none | none | none | none |
| 1981 | none | none | none | none |
| 1980 | none | none | none | none |
| 1979 | Jan 29 | none | none | none |
| 1978 | none | Dec 8 | none | none |
| 1977 | none | none | none | none |
| 1976 | Feb 6 | Dec 17 | Jan 10 | Dec 28 |
| 1975 | Jan 30 | Dec 7 | none | Dec 18 |
| 1974 | none | Dec 27 | none | Dec 27 |
| 1973 | Jan 8 | none | none | none |
| 1972 | none | Dec 9 | none | Dec 9 |
| 1971 | none | no data | none | no data |
| 1970 | none | none | none | none |
| 1969 | Jan 11 | none | none | none |
| 1968 | Jan 8 | Dec 21 | none | none |
| 1967 | none | Dec 6 | none | none |
| 1966 | Mar 3 | Dec 28 | none | none |
| 1965 | none | Dec 17 | none | none |
| 1964 | Mar 7 | no data | none | no data |
| 1963 | Jan 21 | no data | Jan 20 | no data |
| 1962 | no data | Dec 25 | no data | Dec 25 |
| 1961 | Jan 20 | Nov 17 | Jan 5 | none |
| 1960 | Jan 17 | Dec 9 | Jan 5 | none |
| 1959 | Jan 3 | Dec 7 | none | none |
| 1958 | no data | none | no data | none |
| 1953 | Mar 14 | Dec 26 | Mar 2 | none |
| 1952 | Jan 10 | Nov 26 | Jan 2 | none |
| 1951 | Mar 5 | Dec 8 | Feb 1 | Dec 10 |
"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.