South Lakes weather by month
What a typical year looks like in South Lakes, Alaska: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Matanuska Experimental Farm, 4 km from South Lakes; records cover 1917–2026.
The year at a glance
- Precipitation a year
- 14.4 in365 mm
- Snow a year
- 49 in126 cm
- Last spring freeze
- May 17
- First fall freeze
- Sep 20
- Heating degree days
- 10,297
- Cooling degree days
- 8
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −19°−28° (heating, 99%) and 78°26° (cooling, 1%).
Month by month
South Lakes in January
Highs average 23°−5° and lows 7°−14°, with 0.81 in21 mm of precipitation and 9 in23 cm of snow in a typical January.
- Record high
- 57°14° (2014)
- Record low
- −40° (1947)
- Heating degree days
- 1561
- Cooling degree days
- 0
South Lakes in February
Highs average 29°−2° and lows 12°−11°, with 0.78 in20 mm of precipitation and 9 in23 cm of snow in a typical February.
- Record high
- 56°13° (1943)
- Record low
- −41° (1947)
- Heating degree days
- 1259
- Cooling degree days
- 0
South Lakes in March
Highs average 34°1° and lows 16°−9°, with 0.52 in13 mm of precipitation and 8 in19 cm of snow in a typical March.
- Record high
- 65°18° (1934)
- Record low
- −30°−34° (1956)
- Heating degree days
- 1237
- Cooling degree days
- 0
South Lakes in April
Highs average 48°9° and lows 29°−2°, with 0.35 in8.9 mm of precipitation and 1.4 in3.6 cm of snow in a typical April.
- Record high
- 73°23° (2005)
- Record low
- −16°−27° (1944)
- Heating degree days
- 802
- Cooling degree days
- 0
South Lakes in May
Highs average 59°15° and lows 38°3°, with 0.72 in18 mm of precipitation and 0.5 in1.3 cm of snow in a typical May.
- Record high
- 83°28° (1947)
- Record low
- 8°−13° (1945)
- Heating degree days
- 515
- Cooling degree days
- 0
South Lakes in June
Highs average 66°19° and lows 46°8°, with 1.2 in31 mm of precipitation in a typical June.
- Record high
- 91°33° (1936)
- Record low
- 27°−3° (1947)
- Heating degree days
- 271
- Cooling degree days
- 2
South Lakes in July
Highs average 68°20° and lows 51°10°, with 1.9 in49 mm of precipitation in a typical July.
- Record high
- 88°31° (2019)
- Record low
- 31°−1° (1934)
- Heating degree days
- 183
- Cooling degree days
- 5
South Lakes in August
Highs average 65°19° and lows 48°9°, with 2.5 in63 mm of precipitation in a typical August.
- Record high
- 87°31° (1968)
- Record low
- 27°−3° (1947)
- Heating degree days
- 260
- Cooling degree days
- 1
South Lakes in September
Highs average 57°14° and lows 40°4°, with 2.3 in59 mm of precipitation in a typical September.
- Record high
- 75°24° (1934)
- Record low
- 15°−9° (1992)
- Heating degree days
- 506
- Cooling degree days
- 0
South Lakes in OctoberThis month
Highs average 43°6° and lows 27°−3°, with 1.4 in35 mm of precipitation and 4 in10 cm of snow in a typical October.
- Record high
- 69°21° (1923)
- Record low
- −11°−24° (1982)
- Heating degree days
- 921
- Cooling degree days
- 0
South Lakes in November
Highs average 29°−2° and lows 14°−10°, with 0.84 in21 mm of precipitation and 8 in21 cm of snow in a typical November.
- Record high
- 58°14° (1936)
- Record low
- −26°−32° (1990)
- Heating degree days
- 1302
- Cooling degree days
- 0
South Lakes in December
Highs average 25°−4° and lows 10°−12°, with 1 in26 mm of precipitation and 10 in25 cm of snow in a typical December.
- Record high
- 55°13° (1934)
- Record low
- −37°−38° (1964)
- Heating degree days
- 1480
- Cooling degree days
- 0