Weather & Climate in Geyserville, CA

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

Geyserville enjoys a temperate climate with an average annual temperature of 60°F (16°C). Winters average 49°F in January while summers reach 72°F in July. The area gets 293 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 42.8 inches. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 213 feet.

Temperature

49°F Jan (9°C) 72°F Jul (22°C)

Annual Average	60.2°F
	11% above US avg
January Average	49°F (9°C)
July Average	72°F (22°C)
Sunny Days	293 days/yr

Geography

Elevation	213 ft (65 m)
Area	4.5 sq mi (11.7 km²)
Population Density	184/sq mi
Coordinates	38.7173°N, 122.9034°W
Timezone	America/Los_Angeles
County	Sonoma County County
Nearest Airport	Sacramento International (SMF) 71 miles away

Precipitation & Snow

Annual Rainfall 42.8"

13% above US avg

Snowfall 0.0"

Wettest Month (Jan) 8.66"

Driest Month (Jul) 0.08"

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

4,015 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	76 km	11 km
Aug 10, 2016	20 km NNE of Upper Lake, California	M5.1	69 km	14 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	57 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	14 km	7 km
Apr 18, 2007	15 km N of Potter Valley, California	M4.8	85 km	5 km
May 12, 2006	7 km W of Cobb, California	M4.7	14 km	4 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	19 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	92 km	8 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	6 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	18 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	13 km	2 km
Sep 25, 2012	3 km N of Talmage, California	M4.5	55 km	11 km
Aug 3, 2006	5 km W of Glen Ellen, California	M4.5	48 km	9 km
Jun 8, 2024	7 km NW of The Geysers, CA	M4.5	13 km	4 km
Sep 19, 1992	7 km NW of Cobb, California	M4.5	19 km	3 km
Apr 24, 2007	7 km WSW of Cobb, California	M4.5	13 km	2 km
Jun 3, 2023	2km NW of The Geysers, CA	M4.5	14 km	4 km
Mar 14, 2013	5 km W of Cobb, California	M4.4	15 km	1 km
Apr 12, 2023	7km WNW of Cobb, CA	M4.4	16 km	2 km
Mar 1, 2011	8 km W of Cobb, California	M4.4	13 km	2 km

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

Tornado History

25 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 1 injury.

Date	Rating	Distance	Path	Fatalities
Jun 1, 1958	EF2	49 km	15.0 mi	0
Mar 18, 2011	EF1	34 km	0.1 mi	0
Jan 27, 2005	EF1	22 km	0.5 mi	0
Dec 5, 1998	EF1	35 km	1.5 mi	0
Dec 23, 1996	EF1	52 km	6.0 mi	0
Feb 22, 1996	EF1	24 km	1.0 mi	0
Dec 2, 1992	EF1	36 km	1.0 mi	0
Dec 2, 1992	EF1	20 km	3.0 mi	0
Dec 2, 1992	EF1	35 km	7.5 mi	0
Feb 27, 1983	EF1	35 km	0.8 mi	0
Nov 10, 1964	EF1	23 km	1.0 mi	0
Feb 17, 1959	EF1	37 km	0.5 mi	0
Apr 27, 2016	EF0	72 km	0.2 mi	0
Feb 19, 2013	EF0	81 km	0.3 mi	0
Apr 7, 2011	EF0	86 km	0.1 mi	0
Mar 23, 2011	EF0	80 km	1.1 mi	0
Mar 21, 2011	EF0	85 km	0.3 mi	0
Mar 20, 2005	EF0	78 km	1.2 mi	0
Jan 11, 2005	EF0	89 km	0.1 mi	0
Dec 29, 2004	EF0	35 km	0.2 mi	0

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

Tsunami History

3 tsunamis recorded within 500 km. Highest wave on record: 4.5 m (15 ft).

Year	Location	Cause	Max Wave	Deaths	Distance
1868	N. CALIFORNIA	Eruption + Earthquake	4.5 m	30	133 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	145 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	119 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (30 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	30 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	62 km
2020	HENNESSEY	314,241	55 km
2015	ROCKY	96,125	45 km
2018	COUNTY	92,450	65 km
1996	FORK	83,209	56 km
2019	KINCADE	77,780	12 km
2015	VALLEY	77,507	26 km
2020	GLASS	68,020	36 km
2017	NUNS	56,883	54 km
2020	WALLBRIDGE	55,194	14 km
1987	MENDENHALL	54,162	92 km
2017	ATLAS	51,664	70 km
2018	RIVER	48,920	39 km
2004	RUMSEY	39,335	55 km
1999	SIXTEEN	37,162	51 km
2017	TUBBS	36,981	26 km
2017	REDWOOD VALLEY INCIDENT	36,545	74 km
1988	MILLER	35,750	77 km
2012	MILL	29,924	71 km
2001	TROUGH	25,270	78 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	49°F (9°C)	8.7 in	Wettest
February	49°F (10°C)	6.7 in
March	51°F (10°C)	5.8 in
April	55°F (13°C)	2.4 in
May	60°F (16°C)	0.8 in
June	66°F (19°C)	0.2 in
July	72°F (22°C)	0.1 in	Warmest, Driest
August	71°F (22°C)	0.2 in
September	68°F (20°C)	0.6 in
October	62°F (17°C)	2.2 in
November	53°F (11°C)	5.9 in
December	47°F (8°C)	6.7 in	Coldest

Geyserville has a seasonal temperature swing of 25°F / from 47°F in December to 72°F in July. Total annual precipitation is 40.2 inches, with January being the wettest month (8.7") and July the driest (0.1").

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