Frost history / Lance Creek 11NNE, WY
Lance Creek 11NNE, WY: frost dates by year
Last spring and first fall frost at NOAA station USC00485374, 2006 to 2020, measured from daily minimum temperatures.
Elevation 4,204 ft, 43.183, -104.604. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 15 | Sep 23 |
| Earliest | May 4 (2017) | Aug 23 (2015) |
| Latest | Jun 12 (2008) | Oct 15 (2007) |
| Trend | 1.8 days earlier per decade | 9.7 days earlier per decade |
| Years with data | 14 | 14 |
At 28°F (hard freeze) the median last spring date is May 6 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 |
|---|---|---|---|---|
| 2020 | May 26 | Sep 8 | May 10 | Sep 9 |
| 2019 | Jun 10 | Oct 3 | May 23 | Oct 3 |
| 2018 | May 4 | Sep 26 | Apr 27 | Oct 6 |
| 2017 | May 4 | Sep 27 | Apr 30 | Oct 10 |
| 2016 | May 18 | Sep 10 | May 14 | Oct 5 |
| 2015 | May 21 | Aug 23 | May 11 | Oct 17 |
| 2014 | May 15 | Sep 12 | Apr 15 | Oct 3 |
| 2013 | May 6 | Oct 4 | May 5 | Oct 5 |
| 2012 | May 13 | Oct 4 | May 12 | Oct 6 |
| 2011 | May 15 | Sep 21 | May 3 | Sep 21 |
| 2010 | May 14 | Sep 7 | May 8 | Oct 21 |
| 2008 | Jun 12 | Oct 7 | May 11 | Oct 13 |
| 2007 | May 24 | Oct 15 | Apr 20 | Oct 16 |
| 2006 | May 15 | Sep 19 | Apr 26 | Oct 12 |
"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.