Westhaven-Moonstone weather by month
What a typical year looks like in Westhaven-Moonstone, California: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Arcata Eureka Airport, 7 km from Westhaven-Moonstone; records cover 1945–2026.
The year at a glance
- Precipitation a year
- 46.1 in1171 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 1
- First fall freeze
- Nov 21
- Heating degree days
- 4,573
- 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 29°−2° (heating, 99%) and 77°25° (cooling, 1%).
Month by month
Westhaven-Moonstone in January
Highs average 56°14° and lows 41°5°, with 7.5 in191 mm of precipitation in a typical January.
- Record high
- 76°24° (2022)
- Record low
- 23°−5° (2007)
- Heating degree days
- 513
- Cooling degree days
- 0
Westhaven-Moonstone in February
Highs average 57°14° and lows 41°5°, with 6.5 in165 mm of precipitation in a typical February.
- Record high
- 80°27° (2016)
- Record low
- 25°−4° (2011)
- Heating degree days
- 459
- Cooling degree days
- 0
Westhaven-Moonstone in March
Highs average 57°14° and lows 41°5°, with 6.3 in160 mm of precipitation in a typical March.
- Record high
- 76°24° (2000)
- Record low
- 27°−3° (2021)
- Heating degree days
- 494
- Cooling degree days
- 0
Westhaven-Moonstone in April
Highs average 58°14° and lows 43°6°, with 4.1 in104 mm of precipitation in a typical April.
- Record high
- 79°26° (2000)
- Record low
- 29°−2° (2009)
- Heating degree days
- 442
- Cooling degree days
- 0
Westhaven-Moonstone in May
Highs average 60°15° and lows 46°8°, with 2.1 in53 mm of precipitation in a typical May.
- Record high
- 94°34° (2008)
- Record low
- 30°−1° (1999)
- Heating degree days
- 377
- Cooling degree days
- 0
Westhaven-Moonstone in June
Highs average 63°17° and lows 49°9°, with 0.96 in24 mm of precipitation in a typical June.
- Record high
- 85°29° (1945)
- Record low
- 36°2° (1999)
- Heating degree days
- 285
- Cooling degree days
- 0
Westhaven-Moonstone in July
Highs average 63°17° and lows 51°11°, with 0.19 in4.8 mm of precipitation in a typical July.
- Record high
- 82°28° (2008)
- Record low
- 42°6° (1993)
- Heating degree days
- 237
- Cooling degree days
- 0
Westhaven-Moonstone in August
Highs average 65°18° and lows 51°11°, with 0.26 in6.6 mm of precipitation in a typical August.
- Record high
- 81°27° (2020)
- Record low
- 38°3° (1995)
- Heating degree days
- 221
- Cooling degree days
- 1
Westhaven-Moonstone in September
Highs average 65°18° and lows 49°9°, with 0.85 in22 mm of precipitation in a typical September.
- Record high
- 96°36° (2017)
- Record low
- 37°3° (1993)
- Heating degree days
- 248
- Cooling degree days
- 2
Westhaven-Moonstone in OctoberThis month
Highs average 64°18° and lows 45°7°, with 2.7 in69 mm of precipitation in a typical October.
- Record high
- 91°33° (2003)
- Record low
- 29°−2° (2002)
- Heating degree days
- 334
- Cooling degree days
- 1
Westhaven-Moonstone in November
Highs average 59°15° and lows 42°6°, with 5.7 in145 mm of precipitation in a typical November.
- Record high
- 79°26° (2002)
- Record low
- 27°−3° (2004)
- Heating degree days
- 435
- Cooling degree days
- 0
Westhaven-Moonstone in December
Highs average 56°13° and lows 40°4°, with 9 in227 mm of precipitation in a typical December.
- Record high
- 74°23° (1999)
- Record low
- 22°−6° (2005)
- Heating degree days
- 528
- Cooling degree days
- 0