Angwin weather by month
What a typical year looks like in Angwin, California: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Calistoga, 11 km from Angwin; records cover 1916–2026.
The year at a glance
- Precipitation a year
- 38.6 in980 mm
- Snow a year
- Rare
- Last spring freeze
- Mar 25
- First fall freeze
- Nov 9
- Heating degree days
- 2,594
- Cooling degree days
- 837
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 25°−4° (heating, 99%) and 104°40° (cooling, 1%).
Month by month
Angwin in January
Highs average 59°15° and lows 39°4°, with 7.9 in202 mm of precipitation in a typical January.
- Record high
- 84°29° (2014)
- Record low
- 17°−8° (2012)
- Heating degree days
- 493
- Cooling degree days
- 0
Angwin in February
Highs average 62°17° and lows 41°5°, with 7.1 in180 mm of precipitation in a typical February.
- Record high
- 88°31° (1996)
- Record low
- 17°−8° (1999)
- Heating degree days
- 381
- Cooling degree days
- 0
Angwin in March
Highs average 66°19° and lows 43°6°, with 5.9 in150 mm of precipitation in a typical March.
- Record high
- 94°34° (2026)
- Record low
- 19°−7° (2010)
- Heating degree days
- 336
- Cooling degree days
- 3
Angwin in April
Highs average 70°21° and lows 44°7°, with 2.3 in59 mm of precipitation in a typical April.
- Record high
- 102°39° (1989)
- Record low
- 20°−7° (2001)
- Heating degree days
- 240
- Cooling degree days
- 9
Angwin in May
Highs average 77°25° and lows 49°9°, with 1.4 in35 mm of precipitation in a typical May.
- Record high
- 104°40° (2001)
- Record low
- 18°−8° (2010)
- Heating degree days
- 122
- Cooling degree days
- 45
Angwin in June
Highs average 85°29° and lows 53°12°, with 0.29 in7.4 mm of precipitation in a typical June.
- Record high
- 108°42° (1917)
- Record low
- 32°0° (2010)
- Heating degree days
- 29
- Cooling degree days
- 137
Angwin in July
Highs average 90°32° and lows 55°13°, with 0.01 in0.3 mm of precipitation in a typical July.
- Record high
- 114°46° (1931)
- Record low
- 32°0° (2010)
- Heating degree days
- 2
- Cooling degree days
- 222
Angwin in August
Highs average 89°32° and lows 54°12°, with 0.03 in0.8 mm of precipitation in a typical August.
- Record high
- 111°44° (1932)
- Record low
- 38°3° (1982)
- Heating degree days
- 1
- Cooling degree days
- 209
Angwin in September
Highs average 87°31° and lows 52°11°, with 0.12 in3 mm of precipitation in a typical September.
- Record high
- 118°48° (2022)
- Record low
- 32°0° (1982)
- Heating degree days
- 14
- Cooling degree days
- 158
Angwin in OctoberThis month
Highs average 79°26° and lows 47°9°, with 1.8 in46 mm of precipitation in a typical October.
- Record high
- 106°41° (1996)
- Record low
- 27°−3° (2002)
- Heating degree days
- 114
- Cooling degree days
- 52
Angwin in November
Highs average 66°19° and lows 42°5°, with 3.8 in96 mm of precipitation in a typical November.
- Record high
- 96°36° (1932)
- Record low
- 21°−6° (2000)
- Heating degree days
- 338
- Cooling degree days
- 2
Angwin in December
Highs average 58°14° and lows 39°4°, with 8 in202 mm of precipitation in a typical December.
- Record high
- 87°31° (1998)
- Record low
- 10°−12° (1932)
- Heating degree days
- 524
- Cooling degree days
- 0