Big Delta weather by month
What a typical year looks like in Big Delta, Alaska: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Big Delta Airport, 18 km from Big Delta; records cover 1917–2026.
The year at a glance
- Precipitation a year
- 10.3 in261 mm
- Snow a year
- Rare
- Last spring freeze
- May 16
- First fall freeze
- Sep 2
- Heating degree days
- 12,782
- Cooling degree days
- 33
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −39° (heating, 99%) and 81°27° (cooling, 1%).
Month by month
Big Delta in January
Highs average 6°−14° and lows −8°−22°, with 0.21 in5.3 mm of precipitation in a typical January.
- Record high
- 54°12° (2009)
- Record low
- −63°−53° (1947)
- Heating degree days
- 2044
- Cooling degree days
- 0
Big Delta in February
Highs average 16°−9° and lows −1°−18°, with 0.23 in5.8 mm of precipitation in a typical February.
- Record high
- 51°11° (1943)
- Record low
- −60°−51° (1947)
- Heating degree days
- 1614
- Cooling degree days
- 0
Big Delta in March
Highs average 25°−4° and lows 4°−16°, with 0.18 in4.6 mm of precipitation in a typical March.
- Record high
- 58°14° (1981)
- Record low
- −49°−45° (1964)
- Heating degree days
- 1576
- Cooling degree days
- 0
Big Delta in April
Highs average 44°7° and lows 24°−5°, with 0.2 in5.1 mm of precipitation in a typical April.
- Record high
- 72°22° (1979)
- Record low
- −37°−38° (1944)
- Heating degree days
- 934
- Cooling degree days
- 0
Big Delta in May
Highs average 59°15° and lows 38°3°, with 0.76 in19 mm of precipitation in a typical May.
- Record high
- 90°32° (1947)
- Record low
- −1°−18° (1945)
- Heating degree days
- 513
- Cooling degree days
- 0
Big Delta in June
Highs average 68°20° and lows 49°9°, with 2.2 in55 mm of precipitation in a typical June.
- Record high
- 92°33° (1969)
- Record low
- 26°−3° (2006)
- Heating degree days
- 209
- Cooling degree days
- 12
Big Delta in July
Highs average 70°21° and lows 52°11°, with 2.4 in60 mm of precipitation in a typical July.
- Record high
- 91°33° (1958)
- Record low
- 32°0° (1971)
- Heating degree days
- 149
- Cooling degree days
- 15
Big Delta in August
Highs average 65°18° and lows 47°8°, with 2 in51 mm of precipitation in a typical August.
- Record high
- 90°32° (1994)
- Record low
- 22°−6° (1948)
- Heating degree days
- 297
- Cooling degree days
- 6
Big Delta in September
Highs average 53°12° and lows 36°2°, with 0.9 in23 mm of precipitation in a typical September.
- Record high
- 79°26° (1963)
- Record low
- −2°−19° (1983)
- Heating degree days
- 605
- Cooling degree days
- 0
Big Delta in OctoberThis month
Highs average 33°1° and lows 20°−7°, with 0.59 in15 mm of precipitation in a typical October.
- Record high
- 74°23° (2003)
- Record low
- −39° (1975)
- Heating degree days
- 1195
- Cooling degree days
- 0
Big Delta in November
Highs average 15°−9° and lows 1°−17°, with 0.41 in10 mm of precipitation in a typical November.
- Record high
- 52°11° (1979)
- Record low
- −47°−44° (1986)
- Heating degree days
- 1705
- Cooling degree days
- 0
Big Delta in December
Highs average 9°−13° and lows −5°−20°, with 0.23 in5.8 mm of precipitation in a typical December.
- Record high
- 55°13° (1985)
- Record low
- −62°−52° (1946)
- Heating degree days
- 1941
- Cooling degree days
- 0