Frost history / Ki Sawyer Wwtp, MI
Ki Sawyer Wwtp, MI: frost dates by year
Last spring and first fall frost at NOAA station USC00204425, 2015 to 2025, measured from daily minimum temperatures.
Elevation 1,116 ft, 46.334, -87.378. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 15 | Oct 13 |
| Earliest | May 9 (2017) | Sep 29 (2022) |
| Latest | Jun 3 (2019) | Oct 23 (2023) |
| Trend | little change (less than half a day per decade) | 11.1 days later per decade |
| Years with data | 10 | 11 |
At 28°F (hard freeze) the median last spring date is Apr 27 and the median first fall date is Oct 25.
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 11 | Oct 21 | Apr 20 | Nov 9 |
| 2024 | May 10 | Oct 17 | Apr 25 | Nov 2 |
| 2023 | May 25 | Oct 23 | Apr 25 | Oct 30 |
| 2022 | May 23 | Sep 29 | Apr 29 | Oct 10 |
| 2021 | May 29 | Oct 18 | Apr 25 | Nov 3 |
| 2020 | May 13 | Oct 11 | May 13 | Oct 16 |
| 2019 | Jun 3 | Oct 13 | May 8 | Oct 25 |
| 2018 | May 12 | Oct 12 | May 11 | Oct 13 |
| 2017 | May 9 | Oct 11 | May 9 | Oct 26 |
| 2016 | May 17 | Oct 14 | Apr 23 | Oct 14 |
| 2015 | no data | Oct 2 | no data | Oct 19 |
"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.