Frost history / Astoria 4S, SD
Astoria 4S, SD: frost dates by year
Last spring and first fall frost at NOAA station USC00390422, 1994 to 2015, measured from daily minimum temperatures.
Elevation 1,890 ft, 44.504, -96.532. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 10 | Oct 5 |
| Earliest | Apr 14 (2007) | Sep 15 (2007) |
| Latest | May 25 (2004) | Oct 15 (2011) |
| Trend | 4.0 days later per decade | 5.2 days later per decade |
| Years with data | 17 | 17 |
At 28°F (hard freeze) the median last spring date is Apr 24 and the median first fall date is Oct 13.
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 | May 20 | no data | Apr 24 | no data |
| 2014 | May 18 | Oct 5 | May 17 | Oct 5 |
| 2013 | no data | Oct 13 | no data | Oct 18 |
| 2012 | Apr 28 | no data | Apr 12 | no data |
| 2011 | no data | Oct 15 | no data | Oct 19 |
| 2010 | May 9 | Oct 12 | Apr 8 | Oct 28 |
| 2009 | May 10 | Oct 9 | Apr 11 | Oct 9 |
| 2008 | May 11 | Oct 14 | Apr 29 | Oct 16 |
| 2007 | Apr 14 | Sep 15 | Apr 14 | Oct 28 |
| 2006 | Apr 26 | Sep 20 | Apr 9 | Oct 11 |
| 2005 | May 15 | Oct 6 | May 3 | Oct 21 |
| 2004 | May 25 | no data | May 25 | no data |
| 2003 | May 20 | Sep 25 | Apr 9 | Sep 30 |
| 2002 | May 24 | Sep 24 | May 2 | Oct 7 |
| 2001 | Apr 24 | Oct 5 | Apr 23 | Oct 6 |
| 1999 | Apr 23 | Oct 1 | Apr 20 | Oct 15 |
| 1998 | no data | Oct 1 | no data | Oct 13 |
| 1997 | May 16 | no data | May 15 | no data |
| 1996 | May 3 | Oct 3 | Apr 26 | Oct 3 |
| 1995 | Apr 28 | Sep 21 | Apr 27 | Sep 22 |
| 1994 | no data | Oct 9 | no data | Oct 25 |
"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.