Frost history / Douglas 1 Se, WY
Douglas 1 Se, WY: frost dates by year
Last spring and first fall frost at NOAA station USC00482685, 1951 to 2015, measured from daily minimum temperatures.
Elevation 4,870 ft, 42.747, -105.360. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 20 | Sep 14 |
| Earliest | May 1 (1962) | Sep 2 (1952) |
| Latest | Jun 8 (2007) | Oct 12 (2015) |
| Trend | little change (less than half a day per decade) | 1.1 days later per decade |
| Years with data | 22 | 23 |
At 28°F (hard freeze) the median last spring date is May 12 and the median first fall date is Oct 4.
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 |
|---|---|---|---|---|
| 2015 | no data | Oct 12 | no data | Oct 24 |
| 2014 | no data | Sep 12 | no data | Sep 12 |
| 2013 | May 5 | Sep 27 | May 3 | Oct 5 |
| 2012 | May 14 | Sep 14 | May 12 | Oct 6 |
| 2011 | May 21 | Sep 21 | May 13 | Sep 21 |
| 2010 | May 14 | Sep 3 | May 14 | Oct 20 |
| 2008 | May 14 | Sep 14 | May 14 | Oct 7 |
| 2007 | Jun 8 | Sep 11 | Apr 20 | Oct 15 |
| 2006 | May 15 | Sep 3 | May 12 | Sep 28 |
| 2005 | May 28 | Sep 13 | May 13 | Oct 6 |
| 2004 | Jun 2 | Oct 2 | May 14 | Oct 31 |
| 2003 | May 20 | Sep 14 | May 20 | Sep 30 |
| 2002 | May 25 | Sep 22 | May 13 | Sep 22 |
| 2001 | no data | Sep 9 | no data | Oct 7 |
| 2000 | May 19 | no data | May 12 | no data |
| 1999 | May 18 | Sep 13 | May 12 | Sep 13 |
| 1998 | Jun 6 | Oct 7 | May 3 | Oct 12 |
| 1997 | May 19 | Sep 28 | May 19 | Oct 9 |
| 1996 | May 29 | Sep 26 | May 5 | Sep 26 |
| 1995 | no data | Sep 20 | no data | Sep 21 |
| 1962 | May 1 | no data | May 1 | no data |
| 1961 | May 9 | Sep 14 | May 6 | Sep 14 |
| 1954 | Jun 8 | no data | May 29 | no data |
| 1953 | May 21 | Sep 21 | May 15 | Oct 4 |
| 1952 | May 10 | Sep 2 | Apr 24 | Sep 14 |
| 1951 | Jun 4 | Sep 13 | Apr 25 | Sep 16 |
"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.