Frost history / Weaverville, CA
Weaverville, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00049490, 1951 to 2018, measured from daily minimum temperatures.
Elevation 2,058 ft, 40.737, -122.940. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 15 | Oct 1 |
| Earliest | Apr 16 (2015) | Sep 11 (1964) |
| Latest | Jul 6 (1955) | Nov 17 (2016) |
| Trend | 4.3 days earlier per decade | 3.6 days later per decade |
| Years with data | 43 | 43 |
At 28°F (hard freeze) the median last spring date is Apr 29 and the median first fall date is Oct 15.
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 |
|---|---|---|---|---|
| 2018 | May 1 | Oct 12 | Apr 17 | Oct 14 |
| 2017 | May 14 | Sep 23 | Apr 9 | Oct 12 |
| 2016 | Apr 26 | Nov 17 | Mar 29 | Nov 17 |
| 2015 | Apr 16 | Nov 3 | Apr 15 | Nov 4 |
| 2014 | May 11 | Nov 16 | Mar 23 | Nov 16 |
| 2013 | Apr 20 | Sep 26 | Apr 17 | Oct 15 |
| 2012 | May 5 | Oct 18 | Apr 6 | Nov 10 |
| 2011 | May 29 | Oct 26 | Apr 30 | Oct 26 |
| 2010 | May 24 | Oct 12 | May 6 | Nov 20 |
| 2009 | Apr 29 | Sep 30 | Apr 29 | Oct 4 |
| 2008 | no data | Oct 10 | no data | Oct 10 |
| 2006 | Apr 20 | no data | Apr 18 | no data |
| 2005 | Apr 20 | Sep 26 | Apr 19 | Nov 26 |
| 2004 | May 13 | Sep 20 | Apr 2 | Nov 1 |
| 2003 | May 19 | Oct 10 | Apr 5 | Oct 13 |
| 2002 | Jun 9 | Oct 1 | Apr 19 | Oct 2 |
| 2001 | May 3 | Oct 19 | Apr 12 | Oct 24 |
| 2000 | May 12 | Sep 25 | Apr 29 | Oct 22 |
| 1999 | Jun 8 | Oct 15 | May 15 | Nov 22 |
| 1998 | Apr 25 | Oct 4 | Apr 16 | Oct 13 |
| 1997 | May 1 | Oct 7 | Apr 11 | Oct 24 |
| 1996 | May 24 | Oct 15 | Apr 15 | Oct 16 |
| 1975 | Jun 25 | Oct 23 | May 5 | Oct 23 |
| 1974 | May 20 | Sep 28 | May 19 | Oct 5 |
| 1973 | no data | Oct 3 | no data | Oct 3 |
| 1972 | May 18 | Sep 20 | Apr 30 | Oct 25 |
| 1971 | May 21 | Sep 19 | May 21 | Oct 16 |
| 1970 | May 12 | Sep 14 | Apr 29 | Sep 14 |
| 1969 | May 5 | Oct 3 | May 5 | Oct 3 |
| 1968 | May 15 | Sep 20 | May 6 | Sep 21 |
| 1967 | May 13 | Oct 14 | May 2 | Oct 14 |
| 1966 | Jun 4 | Sep 12 | Jun 3 | Oct 13 |
| 1965 | no data | Sep 17 | no data | Sep 19 |
| 1964 | May 15 | Sep 11 | May 6 | Oct 17 |
| 1963 | May 12 | Oct 23 | Apr 24 | Oct 31 |
| 1962 | Jun 4 | Oct 5 | May 20 | Oct 17 |
| 1961 | Jun 29 | Sep 24 | Jun 29 | Oct 8 |
| 1960 | May 24 | Sep 21 | Apr 28 | Oct 9 |
| 1959 | May 27 | Sep 28 | May 4 | Oct 28 |
| 1958 | Apr 27 | Sep 24 | Apr 25 | Sep 24 |
| 1957 | Apr 25 | Oct 20 | Apr 8 | Oct 20 |
| 1956 | May 27 | Sep 13 | May 12 | Sep 13 |
| 1955 | Jul 6 | Sep 18 | Jun 1 | Sep 26 |
| 1954 | Jun 17 | Sep 29 | May 1 | Sep 30 |
| 1952 | Jun 12 | no data | Apr 21 | no data |
| 1951 | Jun 7 | no data | Apr 30 | no data |
"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.