Frost history / Mullan Pass Vor/Dme, ID
Mullan Pass Vor/Dme, ID: frost dates by year
Last spring and first fall frost at NOAA station USW00024154, 1951 to 2024, measured from daily minimum temperatures.
Elevation 6,028 ft, 47.457, -115.645. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 16 | Sep 17 |
| Earliest | May 18 (2015) | Aug 26 (2008) |
| Latest | Jul 4 (2000) | Oct 21 (2022) |
| Trend | 1.1 days earlier per decade | 0.8 days later per decade |
| Years with data | 35 | 36 |
At 28°F (hard freeze) the median last spring date is May 22 and the median first fall date is Oct 6.
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 | Jun 18 | Sep 29 | May 7 | Oct 17 |
| 2023 | Jun 20 | Oct 11 | Apr 22 | Oct 24 |
| 2022 | Jun 14 | Oct 21 | May 19 | Oct 21 |
| 2021 | Jun 7 | Sep 16 | May 22 | Oct 10 |
| 2020 | Jun 15 | Sep 7 | May 4 | Oct 21 |
| 2019 | Jun 20 | Sep 28 | Apr 30 | Sep 28 |
| 2018 | Jun 11 | Sep 29 | Apr 22 | Oct 3 |
| 2017 | Jun 11 | Sep 15 | May 17 | Oct 2 |
| 2016 | Jun 15 | Sep 11 | Apr 15 | Oct 11 |
| 2015 | May 18 | Sep 5 | Apr 26 | Nov 3 |
| 2014 | Jun 18 | Sep 10 | May 12 | Sep 11 |
| 2013 | May 31 | Sep 24 | May 23 | Oct 2 |
| 2012 | Jun 10 | Sep 11 | Jun 6 | Oct 2 |
| 2011 | Jun 25 | Oct 6 | May 26 | Oct 24 |
| 2010 | Jun 17 | Sep 5 | May 23 | Oct 24 |
| 2009 | Jun 22 | Sep 29 | May 20 | Sep 30 |
| 2008 | Jun 11 | Aug 26 | Jun 11 | Oct 8 |
| 2007 | Jun 25 | Sep 21 | May 28 | Sep 29 |
| 2006 | May 29 | Sep 14 | May 9 | Oct 9 |
| 2005 | Jun 7 | Sep 23 | May 1 | Oct 4 |
| 2004 | Jun 15 | Sep 19 | May 13 | Oct 18 |
| 2003 | Jun 22 | Sep 16 | May 19 | Oct 10 |
| 2002 | Jun 18 | Sep 21 | Jun 8 | Sep 30 |
| 2001 | Jun 13 | Sep 7 | Jun 13 | Oct 5 |
| 2000 | Jul 4 | Sep 8 | Jun 1 | Sep 21 |
| 1999 | Jun 25 | Aug 30 | Jun 6 | Sep 26 |
| 1998 | Jun 16 | Oct 2 | May 27 | Oct 11 |
| 1997 | Jun 22 | Oct 5 | May 7 | Oct 7 |
| 1996 | no data | Sep 5 | no data | Sep 22 |
| 1957 | Jun 15 | Sep 18 | May 20 | Sep 18 |
| 1956 | Jun 11 | Sep 21 | Jun 5 | Oct 13 |
| 1955 | Jul 2 | Sep 14 | Jul 2 | Sep 21 |
| 1954 | Jun 28 | Sep 17 | Jun 17 | Sep 28 |
| 1953 | Jun 24 | Sep 24 | May 25 | Oct 2 |
| 1952 | Jun 22 | Sep 13 | Jun 13 | Oct 14 |
| 1951 | Jun 8 | Sep 11 | Jun 2 | Oct 14 |
"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.