Frost history / Custer Co Ap, SD
Custer Co Ap, SD: frost dates by year
Last spring and first fall frost at NOAA station USW00094032, 1999 to 2024, measured from daily minimum temperatures.
Elevation 5,545 ft, 43.733, -103.611. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 28 | Sep 22 |
| Earliest | May 2 (2023) | Aug 17 (2002) |
| Latest | Jun 19 (2024) | Oct 15 (2015) |
| Trend | 2.7 days earlier per decade | 6.6 days later per decade |
| Years with data | 24 | 25 |
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 |
|---|---|---|---|---|
| 2024 | Jun 19 | Sep 22 | May 4 | Oct 25 |
| 2023 | May 2 | Oct 6 | May 2 | Oct 15 |
| 2022 | Jun 1 | Sep 10 | May 22 | Oct 24 |
| 2021 | May 28 | Oct 12 | May 11 | Oct 13 |
| 2020 | May 25 | Aug 31 | May 11 | Sep 8 |
| 2019 | Jun 9 | Oct 1 | May 10 | Oct 3 |
| 2018 | May 20 | Sep 25 | Apr 25 | Oct 4 |
| 2017 | May 24 | Sep 17 | Apr 30 | Oct 3 |
| 2016 | May 17 | Oct 5 | May 15 | Oct 12 |
| 2015 | May 30 | Oct 15 | May 21 | Oct 16 |
| 2013 | Jun 6 | Sep 27 | May 5 | Oct 4 |
| 2012 | May 28 | Oct 3 | May 12 | Oct 3 |
| 2011 | May 28 | Sep 4 | May 3 | Oct 18 |
| 2010 | May 14 | Sep 7 | May 14 | Oct 13 |
| 2009 | Jun 8 | Sep 28 | May 16 | Sep 28 |
| 2008 | Jun 12 | Sep 3 | May 11 | Oct 12 |
| 2007 | Jun 8 | Sep 10 | May 26 | Oct 21 |
| 2006 | May 16 | Sep 16 | May 11 | Sep 27 |
| 2005 | May 15 | Oct 4 | May 14 | Oct 5 |
| 2004 | May 25 | Sep 28 | May 14 | Oct 15 |
| 2003 | Jun 8 | Sep 13 | May 20 | Sep 18 |
| 2002 | May 25 | Aug 17 | May 24 | Sep 21 |
| 2001 | Jun 5 | Sep 9 | May 2 | Oct 4 |
| 2000 | Jun 17 | Sep 22 | May 13 | Sep 22 |
| 1999 | no data | Sep 13 | no data | Sep 13 |
"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.