Frost history / Montague Siskiyou Co Ap, CA
Montague Siskiyou Co Ap, CA: frost dates by year
Last spring and first fall frost at NOAA station USW00024259, 1951 to 2024, measured from daily minimum temperatures.
Elevation 2,635 ft, 41.781, -122.472. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 14 | Oct 8 |
| Earliest | Apr 21 (2005) | Sep 20 (2006) |
| Latest | Jun 12 (1952) | Oct 23 (2022) |
| Trend | 2.0 days earlier per decade | 1.5 days later per decade |
| Years with data | 26 | 25 |
At 28°F (hard freeze) the median last spring date is Apr 24 and the median first fall date is Oct 18.
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 | May 23 | Oct 17 | Apr 8 | Oct 18 |
| 2023 | May 9 | Oct 12 | Apr 20 | Oct 26 |
| 2022 | May 13 | Oct 23 | May 11 | Nov 10 |
| 2021 | May 8 | Oct 8 | Apr 27 | Oct 12 |
| 2020 | May 7 | Oct 11 | Apr 7 | Oct 23 |
| 2019 | May 3 | Oct 1 | May 1 | Oct 11 |
| 2018 | Jun 10 | Oct 5 | Apr 17 | Oct 15 |
| 2017 | May 18 | Sep 22 | Apr 21 | Oct 12 |
| 2016 | Apr 30 | Oct 1 | Apr 26 | Nov 16 |
| 2015 | Apr 23 | Oct 21 | Apr 15 | Nov 4 |
| 2014 | May 11 | Oct 13 | May 11 | Nov 11 |
| 2013 | May 22 | Sep 27 | May 22 | Oct 11 |
| 2012 | May 18 | Oct 11 | Apr 27 | Oct 17 |
| 2011 | May 28 | Oct 23 | May 1 | Oct 25 |
| 2010 | May 29 | Oct 12 | May 22 | Oct 27 |
| 2009 | May 13 | Oct 1 | Apr 25 | Oct 28 |
| 2008 | May 22 | Oct 10 | May 1 | Oct 11 |
| 2007 | May 22 | Sep 24 | Apr 23 | Oct 6 |
| 2006 | May 9 | Sep 20 | Apr 19 | Oct 18 |
| 2005 | Apr 21 | Sep 24 | Apr 20 | Oct 2 |
| 2004 | May 12 | Sep 21 | Apr 19 | Oct 25 |
| 2003 | May 18 | Oct 11 | Apr 19 | Oct 13 |
| 2002 | May 23 | Sep 30 | May 9 | Oct 11 |
| 2001 | May 6 | Oct 9 | Apr 14 | Oct 18 |
| 1952 | Jun 12 | no data | Jun 12 | no data |
| 1951 | May 14 | Oct 5 | Mar 31 | Oct 26 |
"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.