Frost history / Johnson Siding, SD
Johnson Siding, SD: frost dates by year
Last spring and first fall frost at NOAA station USC00394343, 1995 to 2010, measured from daily minimum temperatures.
Elevation 4,184 ft, 44.084, -103.434. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 24 | Sep 22 |
| Earliest | May 11 (1996) | Sep 7 (2010) |
| Latest | Jun 30 (1995) | Oct 5 (2001) |
| Trend | 4.5 days earlier per decade | 4.8 days earlier per decade |
| Years with data | 14 | 15 |
At 28°F (hard freeze) the median last spring date is May 11 and the median first fall date is Sep 28.
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 |
|---|---|---|---|---|
| 2010 | May 14 | Sep 7 | May 14 | Oct 12 |
| 2009 | Jun 8 | Sep 28 | May 16 | Sep 28 |
| 2007 | Jun 8 | Sep 10 | Apr 20 | Sep 25 |
| 2006 | May 14 | Sep 19 | May 10 | Sep 19 |
| 2005 | May 29 | Sep 29 | May 14 | Oct 5 |
| 2004 | May 25 | Oct 1 | May 25 | Oct 2 |
| 2003 | May 20 | Sep 14 | May 20 | Sep 30 |
| 2002 | no data | Sep 22 | no data | Sep 22 |
| 2001 | May 24 | Oct 5 | May 7 | Oct 5 |
| 2000 | Jun 2 | Sep 23 | May 13 | Sep 23 |
| 1999 | May 17 | Sep 13 | May 12 | Sep 13 |
| 1998 | Jun 5 | Oct 5 | May 7 | Oct 12 |
| 1997 | May 20 | Sep 20 | May 9 | Oct 9 |
| 1996 | May 11 | Sep 24 | May 10 | Sep 26 |
| 1995 | Jun 30 | Sep 20 | Apr 28 | Sep 21 |
"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.