Frost history / Ramona Ap, CA
Ramona Ap, CA: frost dates by year
Last spring and first fall frost at NOAA station USW00053120, 1999 to 2024, measured from daily minimum temperatures.
Elevation 1,393 ft, 33.038, -116.916. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 4 | Nov 21 |
| Earliest | Feb 24 (2001) | Oct 19 (2021) |
| Latest | May 11 (2022) | Dec 26 (2014) |
| Trend | 1.8 days later per decade | 9.5 days earlier per decade |
| Years with data | 26 | 26 |
At 28°F (hard freeze) the median last spring date is Feb 23 and the median first fall date is Dec 5.
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 7 | Nov 1 | Jan 14 | Nov 18 |
| 2023 | Apr 5 | Nov 9 | Mar 2 | Nov 10 |
| 2022 | May 11 | Nov 4 | Mar 11 | Nov 23 |
| 2021 | Mar 27 | Oct 19 | Mar 3 | Dec 12 |
| 2020 | Mar 28 | Oct 27 | Feb 6 | Dec 5 |
| 2019 | Feb 24 | Oct 29 | Feb 23 | none |
| 2018 | Mar 27 | Dec 3 | Feb 28 | Dec 29 |
| 2017 | Feb 25 | Nov 28 | Jan 31 | Dec 20 |
| 2016 | Mar 24 | Nov 26 | Feb 2 | Dec 18 |
| 2015 | Mar 6 | Nov 11 | Jan 4 | Dec 15 |
| 2014 | Apr 3 | Dec 26 | none | Dec 26 |
| 2013 | Apr 18 | Dec 5 | Feb 26 | Dec 9 |
| 2012 | Apr 15 | Nov 11 | Mar 8 | Dec 12 |
| 2011 | Apr 10 | Oct 28 | Feb 28 | Dec 4 |
| 2010 | Apr 23 | Nov 10 | none | Nov 25 |
| 2009 | Apr 5 | Oct 29 | Feb 10 | Dec 23 |
| 2008 | Apr 10 | Dec 18 | Jan 20 | Dec 19 |
| 2007 | Apr 19 | Dec 12 | Mar 2 | Dec 13 |
| 2006 | Mar 25 | Nov 28 | Feb 25 | Dec 5 |
| 2005 | Apr 5 | Nov 27 | none | Nov 29 |
| 2004 | Feb 28 | Nov 23 | Feb 15 | Nov 30 |
| 2003 | Apr 6 | Nov 24 | Feb 5 | Dec 3 |
| 2002 | Mar 25 | Dec 10 | Mar 19 | Dec 19 |
| 2001 | Feb 24 | Nov 27 | Feb 9 | Nov 27 |
| 2000 | Mar 31 | Nov 12 | Jan 9 | Nov 14 |
| 1999 | Apr 10 | Nov 19 | Apr 10 | 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 1991–2020 frost probabilities.