Frost history / Millinocket Wastewater, ME
Millinocket Wastewater, ME: frost dates by year
Last spring and first fall frost at NOAA station USC00175305, 2010 to 2025, measured from daily minimum temperatures.
Elevation 360 ft, 45.640, -68.675. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 20 | Sep 26 |
| Earliest | May 2 (2011) | Sep 9 (2018) |
| Latest | Jun 3 (2020) | Oct 12 (2010) |
| Trend | 5.4 days later per decade | 10.9 days earlier per decade |
| Years with data | 14 | 13 |
At 28°F (hard freeze) the median last spring date is May 4 and the median first fall date is Oct 6.
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 2 | no data | May 1 | no data |
| 2023 | May 26 | no data | May 11 | no data |
| 2022 | Jun 2 | Sep 20 | Jun 2 | Oct 3 |
| 2021 | May 15 | Oct 9 | Apr 25 | Oct 29 |
| 2020 | Jun 3 | Sep 18 | Jun 3 | Sep 19 |
| 2019 | May 28 | Sep 18 | May 1 | Oct 6 |
| 2018 | May 20 | Sep 9 | May 18 | Sep 24 |
| 2017 | May 21 | Oct 1 | Apr 26 | Oct 3 |
| 2016 | May 12 | Sep 30 | May 2 | Oct 15 |
| 2015 | May 15 | Sep 26 | Apr 23 | Oct 4 |
| 2014 | May 29 | Sep 19 | May 9 | Sep 19 |
| 2013 | May 28 | Oct 6 | May 15 | Oct 24 |
| 2012 | May 7 | Sep 20 | May 7 | Oct 9 |
| 2011 | May 2 | Oct 7 | Apr 25 | Oct 7 |
| 2010 | no data | Oct 12 | 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.