Frost history / Morongo Valley N, CA
Morongo Valley N, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00045860, 2009 to 2023, measured from daily minimum temperatures.
Elevation 3,145 ft, 34.086, -116.562. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 17 | Dec 5 |
| Earliest | Jan 3 (2015) | Oct 20 (2021) |
| Latest | Apr 10 (2011) | Dec 28 (2014) |
| Trend | 1.4 days earlier per decade | 8.2 days earlier per decade |
| Years with data | 12, 1 with no freeze | 14, 3 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 23 and the median first fall date is Dec 20.
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 |
|---|---|---|---|---|
| 2023 | Apr 5 | none | Feb 26 | none |
| 2022 | Mar 7 | Dec 12 | none | none |
| 2021 | Mar 17 | Oct 20 | Jan 26 | none |
| 2019 | Feb 24 | Nov 28 | Feb 19 | none |
| 2018 | Mar 19 | none | Feb 25 | none |
| 2017 | no data | none | no data | none |
| 2016 | Feb 4 | Dec 18 | none | none |
| 2015 | Jan 3 | Nov 27 | Jan 2 | none |
| 2014 | none | Dec 28 | none | none |
| 2013 | Feb 21 | Dec 5 | Feb 21 | Dec 8 |
| 2012 | Mar 21 | Nov 11 | Mar 19 | none |
| 2011 | Apr 10 | Dec 6 | Feb 28 | none |
| 2010 | Apr 1 | Nov 22 | none | Dec 31 |
| 2009 | no data | Dec 7 | 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.