Frost history / Pellston Ap #2, MI
Pellston Ap #2, MI: frost dates by year
Last spring and first fall frost at NOAA station USC00206442, 2002 to 2013, measured from daily minimum temperatures.
Elevation 712 ft, 45.572, -84.786. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 29 | Sep 23 |
| Earliest | May 16 (2010) | Sep 17 (2011) |
| Latest | Jun 26 (2004) | Oct 3 (2008) |
| Trend | 4.0 days earlier per decade | 13.5 days earlier per decade |
| Years with data | 11 | 10 |
At 28°F (hard freeze) the median last spring date is May 13 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 |
|---|---|---|---|---|
| 2013 | Jun 4 | no data | May 13 | no data |
| 2012 | May 31 | Sep 19 | May 17 | Oct 7 |
| 2011 | May 27 | Sep 17 | Apr 30 | Sep 17 |
| 2010 | May 16 | Sep 20 | May 11 | Oct 3 |
| 2009 | Jun 7 | Sep 19 | May 18 | Oct 1 |
| 2008 | May 29 | Oct 3 | May 28 | Oct 17 |
| 2007 | Jun 6 | Sep 29 | May 13 | Oct 25 |
| 2006 | May 24 | Sep 21 | May 7 | Oct 1 |
| 2005 | May 20 | Sep 24 | May 12 | Oct 9 |
| 2004 | Jun 26 | Sep 29 | May 30 | Oct 5 |
| 2003 | no data | Oct 2 | no data | Oct 2 |
| 2002 | May 26 | no data | May 25 | no data |
"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.