Weather & Climate in Cobb, CA

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

Cobb enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 44°F in January while summers reach 74°F in July. The area gets 326 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 29.9 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 2,939 feet.

Temperature

44°F Jan (7°C) 74°F Jul (23°C)

Annual Average	56.9°F
	5% above US avg
January Average	44°F (7°C)
July Average	74°F (23°C)
Sunny Days	326 days/yr

Geography

Elevation	2,939 ft (896 m)
Area	5.0 sq mi (12.9 km²)
Population Density	186/sq mi
Coordinates	38.8353°N, 122.7224°W
Timezone	America/Los_Angeles
County	Sonoma County County
Nearest Airport	Sacramento International (SMF) 62 miles away

Precipitation & Snow

Annual Rainfall 29.9"

21% below US avg

Snowfall 0.4"

Wettest Month (Jan) 8.07"

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

4,056 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	78 km	11 km
Aug 10, 2016	20 km NNE of Upper Lake, California	M5.1	55 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	17 km	7 km
Apr 18, 2007	15 km N of Potter Valley, California	M4.8	77 km	5 km
May 12, 2006	7 km W of Cobb, California	M4.7	8 km	4 km
Jan 19, 2008	31 km NW of Rancho Tehama Reserve, California	M4.7	149 km	2 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	3 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	103 km	8 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	18 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	4 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	9 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	54 km	9 km
Jan 19, 2008	34 km WNW of Rancho Tehama Reserve, California	M4.5	148 km	10 km
Jun 8, 2024	7 km NW of The Geysers, CA	M4.5	9 km	4 km
Sep 19, 1992	7 km NW of Cobb, California	M4.5	7 km	3 km
Apr 24, 2007	7 km WSW of Cobb, California	M4.5	8 km	2 km
Jun 3, 2023	2km NW of The Geysers, CA	M4.5	7 km	4 km
Mar 14, 2013	5 km W of Cobb, California	M4.4	6 km	1 km

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

Tornado History

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

Date	Rating	Distance	Path	Fatalities
Jun 1, 1958	EF2	66 km	15.0 mi	0
Mar 26, 2014	EF1	98 km	1.0 mi	0
Mar 26, 2014	EF1	97 km	0.6 mi	0
Oct 22, 2012	EF1	98 km	2.0 mi	0
May 25, 2011	EF1	100 km	21.7 mi	0
May 25, 2011	EF1	89 km	26.4 mi	0
Mar 18, 2011	EF1	43 km	0.1 mi	0
Jan 27, 2005	EF1	42 km	0.5 mi	0
Dec 5, 1998	EF1	43 km	1.5 mi	0
Dec 23, 1996	EF1	68 km	6.0 mi	0
Feb 22, 1996	EF1	32 km	1.0 mi	0
Apr 17, 1993	EF1	93 km	0.5 mi	0
Dec 2, 1992	EF1	33 km	3.0 mi	0
Dec 2, 1992	EF1	49 km	1.0 mi	0
Dec 2, 1992	EF1	51 km	7.5 mi	0
Feb 27, 1983	EF1	43 km	0.8 mi	0
Jun 28, 1970	EF1	98 km	2.3 mi	0
Nov 10, 1964	EF1	35 km	1.0 mi	0
Feb 17, 1959	EF1	58 km	0.5 mi	0
Sep 28, 2019	EF0	89 km	1.7 mi	0

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

Tsunami History

2 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	137 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	128 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (16 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	16 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	48 km
2020	HENNESSEY	314,241	45 km
2015	ROCKY	96,125	25 km
2018	COUNTY	92,450	52 km
1996	FORK	83,209	41 km
2019	KINCADE	77,780	19 km
2015	VALLEY	77,507	11 km
2020	GLASS	68,020	35 km
2017	NUNS	56,883	57 km
2020	WALLBRIDGE	55,194	34 km
1987	MENDENHALL	54,162	83 km
2017	ATLAS	51,664	67 km
2018	RIVER	48,920	35 km
2004	RUMSEY	39,335	40 km
1999	SIXTEEN	37,162	34 km
2017	TUBBS	36,981	30 km
2017	REDWOOD VALLEY INCIDENT	36,545	70 km
1988	MILLER	35,750	71 km
2012	MILL	29,924	55 km
2001	TROUGH	25,270	63 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	44°F (7°C)	8.1 in	Wettest
February	45°F (7°C)	6.1 in
March	47°F (8°C)	5.3 in
April	51°F (10°C)	2.4 in
May	57°F (14°C)	0.6 in
June	64°F (18°C)	0.3 in
July	74°F (23°C)	0.1 in	Warmest, Driest
August	71°F (21°C)	0.2 in
September	66°F (19°C)	0.7 in
October	59°F (15°C)	2.4 in
November	49°F (9°C)	6.2 in
December	44°F (6°C)	7.0 in	Coldest

Cobb has a seasonal temperature swing of 30°F / from 44°F in December to 74°F in July. Total annual precipitation is 39.3 inches, with January being the wettest month (8.1") and July the driest (0.1").

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