Frost history / Vacaville Nut Tree Ap, CA
Vacaville Nut Tree Ap, CA: frost dates by year
Last spring and first fall frost at NOAA station USW00093241, 1999 to 2024, measured from daily minimum temperatures.
Elevation 109 ft, 38.377, -121.957. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 26 | Nov 25 |
| Earliest | Jan 1 (2016) | Nov 1 (2019) |
| Latest | Apr 9 (1999) | Dec 27 (2014) |
| Trend | 3.7 days later per decade | 5.5 days earlier per decade |
| Years with data | 26, 1 with no freeze | 26, 1 with no freeze |
At 28°F (hard freeze) the median last spring date is Jan 23 and the median first fall date is Dec 8.
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 |
|---|---|---|---|---|
| 2024 | Apr 6 | Nov 19 | none | none |
| 2023 | Mar 27 | Nov 25 | none | Nov 27 |
| 2022 | Mar 12 | Nov 14 | Feb 24 | Nov 30 |
| 2021 | Jan 26 | Dec 10 | Jan 26 | none |
| 2020 | Mar 27 | Nov 10 | none | none |
| 2019 | Feb 23 | Nov 1 | Jan 2 | Nov 29 |
| 2018 | Mar 5 | Nov 10 | Feb 24 | none |
| 2017 | Feb 26 | Dec 8 | none | Dec 13 |
| 2016 | Jan 1 | Dec 6 | none | Dec 19 |
| 2015 | Jan 5 | Nov 25 | Jan 3 | Nov 29 |
| 2014 | Feb 5 | Dec 27 | Feb 5 | none |
| 2013 | Feb 27 | Nov 25 | Jan 21 | Dec 4 |
| 2012 | Feb 26 | Nov 11 | Jan 18 | Dec 19 |
| 2011 | Feb 27 | Dec 4 | Jan 10 | Dec 9 |
| 2010 | none | Nov 24 | none | none |
| 2009 | Feb 10 | Dec 7 | Jan 4 | Dec 8 |
| 2008 | Jan 15 | Dec 9 | none | Dec 18 |
| 2007 | Feb 28 | Dec 1 | Jan 23 | none |
| 2006 | Mar 11 | Nov 24 | none | Dec 17 |
| 2005 | Jan 12 | Nov 27 | none | none |
| 2004 | Feb 11 | Nov 29 | Jan 23 | Dec 4 |
| 2003 | Feb 10 | Nov 23 | Feb 9 | Dec 27 |
| 2002 | Mar 19 | Dec 25 | Jan 31 | none |
| 2001 | Apr 8 | none | Jan 18 | none |
| 2000 | Jan 6 | Nov 12 | Jan 2 | Nov 18 |
| 1999 | Apr 9 | Dec 10 | Feb 2 | 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.