Frost history / Port Alsworth 1 Sw, AK
Port Alsworth 1 Sw, AK: frost dates by year
Last spring and first fall frost at NOAA station USW00026562, 2010 to 2024, measured from daily minimum temperatures.
Elevation 321 ft, 60.195, -154.320. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 7 | Sep 10 |
| Earliest | May 22 (2019) | Aug 28 (2021) |
| Latest | Jul 1 (2023) | Sep 21 (2019) |
| Trend | 5.1 days later per decade | 1.3 days earlier per decade |
| Years with data | 14 | 14 |
At 28°F (hard freeze) the median last spring date is May 26 and the median first fall date is Sep 23.
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 | Jun 12 | no data | May 18 | no data |
| 2023 | Jul 1 | Sep 8 | Jun 1 | Sep 19 |
| 2022 | Jun 1 | Sep 20 | May 25 | Sep 21 |
| 2021 | Jun 15 | Aug 28 | May 25 | Aug 28 |
| 2020 | Jun 20 | Sep 11 | May 27 | Oct 12 |
| 2019 | May 22 | Sep 21 | May 18 | Sep 26 |
| 2018 | Jun 9 | Aug 29 | May 25 | Oct 20 |
| 2017 | Jun 1 | Sep 11 | May 30 | Sep 30 |
| 2016 | May 31 | Sep 14 | May 5 | Sep 25 |
| 2015 | May 27 | Sep 1 | May 27 | Sep 20 |
| 2014 | Jun 6 | Aug 30 | May 26 | Sep 23 |
| 2013 | Jun 6 | Sep 15 | Jun 6 | Sep 16 |
| 2012 | Jun 15 | Sep 9 | Jun 5 | Sep 10 |
| 2011 | Jun 17 | Sep 9 | May 13 | Sep 28 |
| 2010 | no data | Sep 19 | no data | Sep 24 |
"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.