Port Alsworth weather by month
What a typical year looks like in Port Alsworth, Alaska: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Port Alsworth 1 SW, 4 km from Port Alsworth; records cover 2009–2026.
The year at a glance
- Precipitation a year
- 23.6 in599 mm
- Snow a year
- Rare
- Last spring freeze
- Jun 6
- First fall freeze
- Sep 10
- Heating degree days
- 10,991
- Cooling degree days
- 4
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −26°−32° (heating, 99%) and 80°27° (cooling, 1%).
Month by month
Port Alsworth in January
Highs average 24°−5° and lows 5°−15°, with 1.6 in39 mm of precipitation in a typical January.
- Record high
- 62°17° (2014)
- Record low
- −42°−41° (2012)
- Heating degree days
- 1572
- Cooling degree days
- 0
Port Alsworth in February
Highs average 29°−2° and lows 10°−12°, with 1.5 in38 mm of precipitation in a typical February.
- Record high
- 53°12° (2010)
- Record low
- −36°−38° (2026)
- Heating degree days
- 1271
- Cooling degree days
- 0
Port Alsworth in March
Highs average 32°0° and lows 11°−12°, with 1.2 in30 mm of precipitation in a typical March.
- Record high
- 61°16° (2016)
- Record low
- −31°−35° (2026)
- Heating degree days
- 1358
- Cooling degree days
- 0
Port Alsworth in April
Highs average 46°8° and lows 24°−4°, with 0.91 in23 mm of precipitation in a typical April.
- Record high
- 62°17° (2014)
- Record low
- −11°−24° (2021)
- Heating degree days
- 898
- Cooling degree days
- 0
Port Alsworth in May
Highs average 58°14° and lows 32°0°, with 0.84 in21 mm of precipitation in a typical May.
- Record high
- 82°28° (2013)
- Record low
- 13°−11° (2012)
- Heating degree days
- 622
- Cooling degree days
- 0
Port Alsworth in June
Highs average 65°19° and lows 41°5°, with 1.2 in31 mm of precipitation in a typical June.
- Record high
- 88°31° (2015)
- Record low
- 25°−4° (2026)
- Heating degree days
- 358
- Cooling degree days
- 1
Port Alsworth in July
Highs average 67°19° and lows 46°8°, with 2.2 in55 mm of precipitation in a typical July.
- Record high
- 91°33° (2019)
- Record low
- 32°0° (2023)
- Heating degree days
- 264
- Cooling degree days
- 3
Port Alsworth in August
Highs average 63°17° and lows 45°7°, with 3.3 in84 mm of precipitation in a typical August.
- Record high
- 81°27° (2015)
- Record low
- 27°−3° (2021)
- Heating degree days
- 336
- Cooling degree days
- 0
Port Alsworth in September
Highs average 55°13° and lows 38°3°, with 3.5 in88 mm of precipitation in a typical September.
- Record high
- 76°24° (2019)
- Record low
- 15°−9° (2021)
- Heating degree days
- 556
- Cooling degree days
- 0
Port Alsworth in OctoberThis month
Highs average 42°5° and lows 25°−4°, with 2.3 in57 mm of precipitation in a typical October.
- Record high
- 64°18° (2009)
- Record low
- 1°−17° (2020)
- Heating degree days
- 980
- Cooling degree days
- 0
Port Alsworth in November
Highs average 30°−1° and lows 15°−9°, with 3 in77 mm of precipitation in a typical November.
- Record high
- 55°13° (2022)
- Record low
- −29°−34° (2021)
- Heating degree days
- 1279
- Cooling degree days
- 0
Port Alsworth in December
Highs average 25°−4° and lows 9°−13°, with 2.2 in55 mm of precipitation in a typical December.
- Record high
- 54°12° (2011)
- Record low
- −36°−38° (2011)
- Heating degree days
- 1497
- Cooling degree days
- 0