Frost history / White Sulphur Springs #2, MT
White Sulphur Springs #2, MT: frost dates by year
Last spring and first fall frost at NOAA station USC00248930, 1979 to 2014, measured from daily minimum temperatures.
Elevation 5,040 ft, 46.544, -110.900. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 3 | Sep 9 |
| Earliest | May 11 (2006) | Aug 6 (1996) |
| Latest | Jun 26 (2007) | Oct 12 (2010) |
| Trend | 2.3 days later per decade | little change (less than half a day per decade) |
| Years with data | 28 | 29 |
At 28°F (hard freeze) the median last spring date is May 21 and the median first fall date is Sep 20.
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 |
|---|---|---|---|---|
| 2014 | May 30 | no data | May 14 | no data |
| 2013 | no data | Sep 26 | no data | Sep 27 |
| 2012 | Jun 7 | Aug 25 | May 28 | Oct 3 |
| 2011 | Jun 4 | Sep 3 | May 19 | Sep 20 |
| 2010 | Jun 12 | Oct 12 | May 21 | Oct 12 |
| 2009 | Jun 8 | Sep 9 | May 21 | Sep 21 |
| 2008 | Jun 12 | Sep 4 | May 13 | Sep 14 |
| 2007 | Jun 26 | Sep 9 | May 17 | Sep 10 |
| 2006 | May 11 | Sep 1 | May 10 | Sep 1 |
| 2005 | Jun 1 | Aug 14 | May 27 | Sep 28 |
| 2004 | Jun 16 | Sep 3 | May 25 | Oct 8 |
| 2003 | Jun 26 | Sep 14 | May 19 | Sep 17 |
| 2002 | Jun 10 | Aug 17 | May 23 | Oct 1 |
| 2001 | May 21 | Sep 20 | May 21 | Oct 5 |
| 2000 | Jun 1 | Sep 20 | Jun 1 | Sep 20 |
| 1999 | Jun 11 | Sep 8 | Jun 11 | Sep 12 |
| 1998 | Jun 5 | no data | Jun 5 | no data |
| 1997 | May 25 | Sep 19 | May 19 | Sep 19 |
| 1996 | May 21 | Aug 6 | May 21 | Sep 23 |
| 1992 | Jun 6 | Aug 22 | May 16 | Aug 25 |
| 1991 | no data | Sep 18 | no data | Sep 18 |
| 1990 | Jun 1 | Sep 21 | May 10 | Oct 6 |
| 1989 | May 31 | Sep 7 | May 29 | Sep 7 |
| 1988 | May 21 | Sep 11 | May 20 | Oct 5 |
| 1987 | Jun 3 | Aug 26 | May 20 | Sep 17 |
| 1986 | May 24 | Sep 7 | May 24 | Sep 7 |
| 1985 | no data | Aug 17 | no data | Sep 23 |
| 1984 | Jun 11 | Sep 10 | Jun 9 | Sep 13 |
| 1983 | May 31 | Sep 10 | May 31 | Sep 19 |
| 1982 | May 31 | no data | May 31 | no data |
| 1981 | no data | Sep 22 | no data | Sep 23 |
| 1979 | Jun 8 | Sep 14 | Jun 8 | Oct 3 |
"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.