Frost history / Hoover, SD
Hoover, SD: frost dates by year
Last spring and first fall frost at NOAA station USC00393945, 2004 to 2018, measured from daily minimum temperatures.
Elevation 2,773 ft, 45.112, -103.268. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 18 | Sep 19 |
| Earliest | May 11 (2008) | Aug 19 (2004) |
| Latest | Jun 22 (2017) | Oct 6 (2016) |
| Trend | 7.2 days later per decade | 7.1 days later per decade |
| Years with data | 13 | 15 |
At 28°F (hard freeze) the median last spring date is May 11 and the median first fall date is Oct 1.
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 |
|---|---|---|---|---|
| 2018 | May 20 | Sep 26 | Apr 25 | Sep 26 |
| 2017 | Jun 22 | Sep 17 | May 2 | Oct 4 |
| 2016 | May 18 | Oct 6 | May 18 | Oct 6 |
| 2015 | May 30 | Aug 23 | May 21 | Oct 16 |
| 2014 | May 15 | Sep 12 | May 15 | Sep 12 |
| 2013 | May 12 | Sep 29 | May 11 | Oct 5 |
| 2012 | May 20 | Sep 12 | May 12 | Sep 13 |
| 2011 | May 15 | Sep 19 | May 2 | Sep 22 |
| 2010 | May 14 | Sep 24 | May 8 | Oct 13 |
| 2009 | Jun 4 | Sep 9 | May 16 | Oct 8 |
| 2008 | May 11 | Sep 24 | May 4 | Sep 24 |
| 2007 | no data | Sep 10 | no data | Sep 14 |
| 2006 | May 15 | Sep 19 | May 5 | Sep 19 |
| 2005 | May 29 | Sep 29 | May 15 | Oct 6 |
| 2004 | no data | Aug 19 | no data | Oct 1 |
"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.