Frost history / New Melones Dam Hq, CA
New Melones Dam Hq, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00046174, 1992 to 2025, measured from daily minimum temperatures.
Elevation 960 ft, 38.005, -120.486. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 28 | Dec 2 |
| Earliest | Jan 5 (2015) | Nov 3 (1994) |
| Latest | May 22 (2008) | Dec 29 (2018) |
| Trend | 2.4 days earlier per decade | 6.2 days later per decade |
| Years with data | 31, 1 with no freeze | 31, 2 with no freeze |
At 28°F (hard freeze) the median last spring date is Jan 26 and the median first fall date is Dec 19.
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 |
|---|---|---|---|---|
| 2025 | Jan 27 | Dec 12 | none | none |
| 2024 | Feb 10 | Nov 19 | none | none |
| 2023 | Apr 4 | Dec 9 | Feb 22 | none |
| 2022 | Apr 13 | Dec 2 | Feb 24 | none |
| 2021 | Mar 16 | Dec 15 | none | Dec 20 |
| 2020 | Feb 5 | Nov 9 | none | none |
| 2019 | Feb 24 | Nov 30 | none | none |
| 2018 | Feb 25 | Dec 29 | Feb 24 | none |
| 2017 | Mar 6 | Dec 21 | none | none |
| 2016 | Feb 2 | Dec 2 | none | none |
| 2015 | Jan 5 | Nov 26 | Jan 1 | Dec 15 |
| 2014 | Feb 19 | Dec 26 | Feb 5 | none |
| 2013 | Feb 26 | Dec 4 | Jan 14 | Dec 5 |
| 2012 | Mar 19 | Dec 18 | none | none |
| 2011 | May 20 | Dec 5 | Feb 26 | none |
| 2010 | Mar 14 | Nov 24 | none | Dec 30 |
| 2009 | Apr 15 | Dec 6 | none | Dec 8 |
| 2008 | May 22 | Dec 4 | none | Dec 16 |
| 2007 | Feb 28 | Dec 9 | Jan 18 | Dec 27 |
| 2006 | no data | Nov 29 | no data | none |
| 2005 | Jan 12 | none | none | none |
| 2004 | Feb 4 | Nov 29 | Feb 4 | none |
| 2003 | none | Nov 26 | none | none |
| 2001 | Apr 10 | no data | Jan 17 | no data |
| 2000 | Jan 7 | no data | none | no data |
| 1999 | Apr 9 | Nov 22 | none | none |
| 1998 | Jan 6 | Dec 5 | none | Dec 21 |
| 1997 | Feb 28 | Dec 10 | Jan 15 | none |
| 1996 | Feb 28 | Nov 7 | none | none |
| 1995 | Apr 19 | none | none | none |
| 1994 | Mar 23 | Nov 3 | none | Dec 8 |
| 1993 | Feb 27 | Nov 24 | Jan 6 | Dec 20 |
| 1992 | no data | Nov 10 | no data | Dec 19 |
"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.