Frost history / Harmony, ME
Harmony, ME: frost dates by year
Last spring and first fall frost at NOAA station USC00173567, 2011 to 2024, measured from daily minimum temperatures.
Elevation 320 ft, 44.947, -69.546. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 16 | Sep 27 |
| Earliest | Apr 28 (2024) | Sep 15 (2014) |
| Latest | Jun 2 (2020) | Oct 24 (2023) |
| Trend | 1.5 days later per decade | 11.4 days later per decade |
| Years with data | 14 | 13 |
At 28°F (hard freeze) the median last spring date is Apr 30 and the median first fall date is Oct 15.
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 |
|---|---|---|---|---|
| 2024 | Apr 28 | no data | Apr 27 | no data |
| 2023 | May 26 | Oct 24 | May 10 | Oct 31 |
| 2022 | May 10 | Sep 30 | Apr 25 | Oct 3 |
| 2021 | May 13 | Oct 24 | Apr 19 | Oct 25 |
| 2020 | Jun 2 | Sep 20 | Jun 1 | Sep 20 |
| 2019 | May 28 | Sep 19 | May 9 | Oct 5 |
| 2018 | May 13 | Sep 23 | May 13 | Oct 14 |
| 2017 | May 21 | Oct 1 | Apr 15 | Oct 17 |
| 2016 | May 18 | Sep 25 | Apr 30 | Oct 15 |
| 2015 | May 23 | Sep 27 | Apr 22 | Oct 18 |
| 2014 | May 13 | Sep 15 | May 8 | Nov 4 |
| 2013 | May 28 | Sep 17 | May 15 | Oct 21 |
| 2012 | May 7 | Oct 9 | Apr 30 | Oct 13 |
| 2011 | May 2 | Oct 6 | Apr 23 | Oct 6 |
"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.