Weather & Climate in Anchor Bay, CA

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Anchor Bay experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 49°F in January while summers reach 57°F in July / relatively mild seasonal variation. The area gets 302 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 39.2 inches. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 671 feet.

Temperature

49°F Jan (10°C) 57°F Jul (14°C)

Annual Average	53.6°F
	1% below US avg
January Average	49°F (10°C)
July Average	57°F (14°C)
Sunny Days	302 days/yr

Geography

Elevation	671 ft (205 m)
Area	3.5 sq mi (9.1 km²)
Population Density	219/sq mi
Coordinates	38.8127°N, 123.5703°W
Timezone	America/Los_Angeles
County	Sonoma County County
Nearest Airport	San Francisco International (SFO) 105 miles away

Precipitation & Snow

Annual Rainfall 39.2"

3% above US avg

Wettest Month (Jan) 8.39"

Driest Month (Jul) 0.12"

Air Quality

AQI Median	48.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively High
Risk Score	99.1 / 100
Social Vulnerability	29.8 / 100
Community Resilience	66.2 / 100

Hazard Breakdown

Tornado	Very Low
Earthquake	Relatively High
Wildfire	Relatively High
Flood	Relatively High
Hail	Very Low
Strong Wind	Very Low
Heat Wave	Relatively Moderate
Winter Weather	Very Low
Lightning	Relatively Moderate
Drought	Relatively High
Cold Wave	No Rating
Landslide	Relatively High
Coastal Flood	Relatively Moderate
Tsunami	Very Low
Volcano	Relatively Low
Avalanche	Very Low

Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

3,430 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.0.

Aug 24, 2014	The 2014 South Napa, California Earthquake	M6.0	128 km	11 km
Aug 10, 2016	20 km NNE of Upper Lake, California	M5.1	88 km	14 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	112 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	73 km	7 km
Apr 18, 2007	15 km N of Potter Valley, California	M4.8	83 km	5 km
May 12, 2006	7 km W of Cobb, California	M4.7	66 km	4 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	71 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	127 km	8 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	57 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	70 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	65 km	2 km
Sep 25, 2012	3 km N of Talmage, California	M4.5	53 km	11 km
Aug 3, 2006	5 km W of Glen Ellen, California	M4.5	99 km	9 km
Jun 8, 2024	7 km NW of The Geysers, CA	M4.5	65 km	4 km
Sep 19, 1992	7 km NW of Cobb, California	M4.5	68 km	3 km
Apr 24, 2007	7 km WSW of Cobb, California	M4.5	67 km	2 km
Jun 3, 2023	2km NW of The Geysers, CA	M4.5	69 km	4 km
Mar 14, 2013	5 km W of Cobb, California	M4.4	68 km	1 km
Mar 1, 2011	8 km W of Cobb, California	M4.4	65 km	2 km
Apr 12, 2023	7km WNW of Cobb, CA	M4.4	66 km	2 km

Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

16 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2.

Date	Rating	Distance	Path	Fatalities
Jun 1, 1958	EF2	78 km	15.0 mi	0
Mar 18, 2011	EF1	85 km	0.1 mi	0
Jan 27, 2005	EF1	45 km	0.5 mi	0
Dec 5, 1998	EF1	86 km	1.5 mi	0
Dec 5, 1998	EF1	71 km	1.7 mi	0
Dec 23, 1996	EF1	84 km	6.0 mi	0
Feb 22, 1996	EF1	79 km	1.0 mi	0
Dec 2, 1992	EF1	74 km	7.5 mi	0
Dec 2, 1992	EF1	79 km	1.0 mi	0
Dec 2, 1992	EF1	71 km	3.0 mi	0
Feb 27, 1983	EF1	86 km	0.8 mi	0
Nov 10, 1964	EF1	74 km	1.0 mi	0
Feb 17, 1959	EF1	43 km	0.5 mi	0
Dec 29, 2004	EF0	86 km	0.2 mi	0
Dec 11, 1983	EF0	48 km	2.0 mi	0
Feb 3, 1958	EF0	8 km	0.1 mi	0

Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (71 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	71 km

Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: RANCH (427,048 acres, 2018).

Year	Name	Acres Burned	Distance
2018	RANCH	427,048	85 km
2015	ROCKY	96,125	98 km
1996	FORK	83,209	84 km
2019	KINCADE	77,780	71 km
2015	VALLEY	77,507	83 km
2020	GLASS	68,020	93 km
2020	WALLBRIDGE	55,194	53 km
1987	MENDENHALL	54,162	93 km
2018	RIVER	48,920	55 km
2017	TUBBS	36,981	82 km
2017	REDWOOD VALLEY INCIDENT	36,545	66 km
2012	MILL	29,924	99 km
2001	TROUGH	25,270	99 km
2017	POCKET	18,691	60 km
1987	FOUTS	16,892	92 km
2008	WALKER	12,441	99 km
2004	GEYSERS	12,075	72 km
1985	UNNAMED	9,655	62 km
2008	MEU LIGHTNING COMPLEX (SUGARLOAF)	8,344	22 km
1988	UNNAMED	5,076	63 km

Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	49°F (10°C)	8.4 in	Wettest
February	49°F (10°C)	6.4 in
March	50°F (10°C)	5.9 in
April	51°F (11°C)	2.8 in
May	54°F (12°C)	0.9 in
June	57°F (14°C)	0.3 in
July	57°F (14°C)	0.1 in	Driest
August	59°F (15°C)	0.3 in
September	60°F (15°C)	0.8 in	Warmest
October	58°F (14°C)	2.8 in
November	52°F (11°C)	7.0 in
December	48°F (9°C)	7.3 in	Coldest

Anchor Bay has a seasonal temperature swing of 12°F / from 48°F in December to 60°F in September. Total annual precipitation is 42.9 inches, with January being the wettest month (8.4") and July the driest (0.1").

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