Frost history / Oroville Muni Ap, CA
Oroville Muni Ap, CA: frost dates by year
Last spring and first fall frost at NOAA station USW00093210, 1998 to 2024, measured from daily minimum temperatures.
Elevation 190 ft, 39.490, -121.618. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 9 | Dec 6 |
| Earliest | Jan 3 (2015) | Nov 12 (2000) |
| Latest | Apr 12 (2022) | Dec 31 (2014) |
| Trend | 5.7 days later per decade | 7.1 days later per decade |
| Years with data | 26, 3 with no freeze | 27, 5 with no freeze |
At 28°F (hard freeze) the median last spring date is Jan 18 and the median first fall date is Dec 13.
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 | Jan 11 | none | none | none |
| 2023 | Mar 1 | Nov 26 | none | none |
| 2022 | Apr 12 | Dec 15 | Feb 24 | none |
| 2021 | Jan 26 | Dec 17 | none | none |
| 2020 | Feb 3 | Dec 23 | none | none |
| 2019 | Feb 22 | none | none | none |
| 2018 | Mar 5 | none | Feb 23 | none |
| 2017 | Jan 16 | Dec 21 | none | none |
| 2016 | none | Dec 6 | none | none |
| 2015 | Jan 3 | Nov 28 | none | Nov 29 |
| 2014 | Feb 1 | Dec 31 | none | none |
| 2013 | Feb 20 | Dec 4 | Jan 18 | Dec 5 |
| 2012 | Feb 27 | Dec 19 | Jan 17 | none |
| 2011 | Feb 27 | Dec 7 | Jan 10 | Dec 24 |
| 2010 | none | Nov 24 | none | none |
| 2009 | Feb 10 | Dec 6 | none | Dec 8 |
| 2008 | none | Dec 10 | none | Dec 18 |
| 2007 | Feb 3 | Nov 30 | Jan 16 | none |
| 2006 | Feb 22 | Nov 29 | none | none |
| 2005 | Jan 14 | Nov 27 | none | none |
| 2004 | Jan 5 | Nov 29 | none | none |
| 2003 | Feb 9 | Nov 22 | none | none |
| 2002 | Mar 8 | none | Jan 29 | none |
| 2001 | Feb 8 | none | Jan 31 | none |
| 2000 | Jan 7 | Nov 12 | Jan 7 | none |
| 1999 | Feb 11 | Dec 15 | none | none |
| 1998 | no data | Dec 5 | no data | Dec 20 |
"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.