Frost history / Mammoth Lakes Rs, CA
Mammoth Lakes Rs, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00045280, 1995 to 2018, measured from daily minimum temperatures.
Elevation 7,804 ft, 37.648, -118.962. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 16 | Sep 11 |
| Earliest | May 20 (2013) | Aug 31 (1999) |
| Latest | Jul 13 (1995) | Oct 7 (2012) |
| Trend | 16.1 days earlier per decade | 9.2 days later per decade |
| Years with data | 15 | 14 |
At 28°F (hard freeze) the median last spring date is Jun 10 and the median first fall date is Oct 2.
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 | no data | Oct 5 | no data | Oct 5 |
| 2017 | no data | Sep 21 | no data | Sep 21 |
| 2016 | May 26 | no data | May 22 | no data |
| 2015 | Jun 5 | Sep 6 | May 18 | Oct 21 |
| 2014 | Jun 3 | Sep 29 | May 22 | Sep 29 |
| 2013 | May 20 | no data | May 20 | no data |
| 2012 | Jun 10 | Oct 7 | Jun 10 | Oct 10 |
| 2011 | no data | Oct 5 | no data | Oct 6 |
| 2006 | Jun 16 | no data | May 29 | no data |
| 2005 | Jun 20 | no data | Jun 19 | no data |
| 2004 | Jun 9 | Sep 4 | May 29 | Sep 4 |
| 2003 | Jun 25 | Sep 10 | May 19 | Oct 11 |
| 2002 | Jun 22 | Sep 8 | Jun 10 | Sep 8 |
| 2001 | no data | Sep 13 | no data | Oct 7 |
| 2000 | no data | Sep 5 | no data | Sep 6 |
| 1999 | Jun 11 | Aug 31 | Jun 11 | Oct 7 |
| 1998 | Jun 17 | no data | Jun 17 | no data |
| 1997 | Jul 1 | no data | Jul 1 | no data |
| 1996 | Jun 28 | Sep 6 | Jun 27 | Sep 14 |
| 1995 | Jul 13 | Sep 27 | Jun 21 | Sep 29 |
"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.