Frost history / Port Austin Wwtp, MI
Port Austin Wwtp, MI: frost dates by year
Last spring and first fall frost at NOAA station USC00206662, 2002 to 2023, measured from daily minimum temperatures.
Elevation 605 ft, 44.047, -82.970. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 1 | Oct 23 |
| Earliest | Apr 20 (2011) | Oct 5 (2003) |
| Latest | May 19 (2009) | Nov 12 (2004) |
| Trend | 6.5 days earlier per decade | 2.0 days later per decade |
| Years with data | 11 | 12 |
At 28°F (hard freeze) the median last spring date is Apr 24 and the median first fall date is Nov 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 |
|---|---|---|---|---|
| 2023 | no data | Oct 23 | no data | Oct 31 |
| 2015 | Apr 26 | no data | Apr 26 | no data |
| 2014 | May 5 | Oct 23 | Apr 24 | Nov 15 |
| 2013 | Apr 26 | Oct 29 | Apr 21 | Oct 29 |
| 2012 | Apr 29 | Oct 8 | Apr 29 | Nov 14 |
| 2011 | Apr 20 | no data | Apr 19 | no data |
| 2010 | Apr 29 | Nov 1 | Apr 23 | Nov 1 |
| 2009 | May 19 | Oct 12 | Apr 14 | Nov 6 |
| 2008 | May 1 | Oct 23 | Apr 16 | Oct 30 |
| 2007 | no data | Nov 2 | no data | Nov 19 |
| 2006 | no data | Oct 26 | no data | Nov 4 |
| 2005 | May 4 | no data | Apr 29 | no data |
| 2004 | May 4 | Nov 12 | May 4 | Nov 12 |
| 2003 | May 4 | Oct 5 | May 4 | Oct 5 |
| 2002 | no data | Oct 8 | no data | Nov 4 |
"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.