Frost history / Mio Wwtp, MI
Mio Wwtp, MI: frost dates by year
Last spring and first fall frost at NOAA station USC00205533, 2007 to 2025, measured from daily minimum temperatures.
Elevation 1,037 ft, 44.647, -84.116. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 24 | Sep 29 |
| Earliest | May 7 (2024) | Aug 31 (2009) |
| Latest | Jun 6 (2015) | Oct 22 (2021) |
| Trend | 6.3 days earlier per decade | 18.6 days later per decade |
| Years with data | 19 | 19 |
At 28°F (hard freeze) the median last spring date is May 13 and the median first fall date is Oct 10.
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 |
|---|---|---|---|---|
| 2025 | May 20 | Oct 9 | May 9 | Oct 9 |
| 2024 | May 7 | Oct 5 | Apr 26 | Oct 10 |
| 2023 | May 26 | Oct 12 | May 26 | Oct 23 |
| 2022 | May 24 | Sep 29 | May 8 | Sep 29 |
| 2021 | May 30 | Oct 22 | May 13 | Oct 24 |
| 2020 | May 31 | Sep 18 | May 13 | Sep 19 |
| 2019 | May 21 | Oct 5 | May 11 | Oct 15 |
| 2018 | May 13 | Oct 5 | May 11 | Oct 18 |
| 2017 | May 20 | Sep 30 | May 20 | Oct 26 |
| 2016 | May 23 | Oct 9 | May 18 | Oct 10 |
| 2015 | Jun 6 | Oct 1 | May 23 | Oct 17 |
| 2014 | May 18 | Sep 14 | May 17 | Oct 11 |
| 2013 | Jun 4 | Sep 14 | May 13 | Oct 23 |
| 2012 | May 17 | Sep 27 | May 17 | Oct 7 |
| 2011 | May 27 | Sep 6 | May 5 | Sep 16 |
| 2010 | May 19 | Sep 19 | May 10 | Oct 4 |
| 2009 | Jun 4 | Aug 31 | May 31 | Oct 1 |
| 2008 | May 29 | Sep 10 | May 28 | Oct 4 |
| 2007 | Jun 6 | Sep 16 | May 18 | Oct 12 |
"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.