Weather & Climate in Glen Ellen, CA

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

Glen Ellen enjoys a temperate climate with an average annual temperature of 58°F (14°C). Winters average 48°F in January while summers reach 67°F in July / relatively mild seasonal variation. 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 25.6 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 693 feet.

Temperature

48°F Jan (9°C) 67°F Jul (19°C)

Annual Average	58.0°F
	7% above US avg
January Average	48°F (9°C)
July Average	67°F (19°C)
Sunny Days	326 days/yr

Geography

Elevation	693 ft (211 m)
Area	0.0 sq mi (0.0 km²)
Population Density	516/sq mi
Coordinates	38.3553°N, 122.5433°W
Timezone	America/Los_Angeles
County	Napa County County
Nearest Airport	Metro Oakland International (OAK) 47 miles away

Precipitation & Snow

Annual Rainfall 25.6"

33% below US avg

Snowfall 0.0"

Wettest Month (Jan) 8.11"

Driest Month (Jul) 0.04"

Air Quality

AQI Median	48.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively High
Risk Score	95.3 / 100
Social Vulnerability	38.5 / 100
Community Resilience	76.0 / 100

Hazard Breakdown

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

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

Earthquake History

4,279 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	26 km	11 km
Aug 10, 2016	20 km NNE of Upper Lake, California	M5.1	111 km	14 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	12 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	40 km	7 km
Apr 18, 2007	15 km N of Potter Valley, California	M4.8	133 km	5 km
May 12, 2006	7 km W of Cobb, California	M4.7	57 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	132 km	8 km
Aug 11, 1993	14 km ESE of Alum Rock, California	M4.7	139 km	9 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	58 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	51 km	8 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	56 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	57 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	56 km	2 km
Sep 19, 2023	15 km SW of Westley, CA	M4.5	150 km	4 km
Sep 25, 2012	3 km N of Talmage, California	M4.5	105 km	11 km
Aug 3, 2006	5 km W of Glen Ellen, California	M4.5	4 km	9 km
Jun 8, 2024	7 km NW of The Geysers, CA	M4.5	57 km	4 km
Sep 19, 1992	7 km NW of Cobb, California	M4.5	60 km	3 km
Apr 24, 2007	7 km WSW of Cobb, California	M4.5	54 km	2 km
Jun 3, 2023	2km NW of The Geysers, CA	M4.5	53 km	4 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	39 km	15.0 mi	0
Mar 18, 2011	EF1	18 km	0.1 mi	0
Jan 23, 2010	EF1	84 km	1.6 mi	0
Mar 20, 2005	EF1	79 km	3.0 mi	0
Jan 27, 2005	EF1	58 km	0.5 mi	0
Dec 5, 1998	EF1	17 km	1.5 mi	0
Dec 23, 1996	EF1	36 km	6.0 mi	0
Feb 22, 1996	EF1	27 km	1.0 mi	0
Dec 2, 1992	EF1	32 km	3.0 mi	0
Dec 2, 1992	EF1	32 km	7.5 mi	0
Dec 2, 1992	EF1	26 km	1.0 mi	0
Feb 27, 1983	EF1	17 km	0.8 mi	0
Nov 10, 1964	EF1	30 km	1.0 mi	0
Feb 17, 1959	EF1	64 km	0.5 mi	0
Apr 1, 1958	EF1	84 km	0.2 mi	0
Sep 28, 2019	EF0	73 km	1.7 mi	0
Jan 11, 2017	EF0	97 km	0.4 mi	0
Apr 27, 2016	EF0	41 km	0.2 mi	0
Feb 28, 2014	EF0	79 km	0.7 mi	0
Apr 7, 2011	EF0	39 km	0.1 mi	0

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

Tsunami History

4 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	83 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	98 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	73 km
1865	N. CALIFORNIA	Eruption + Earthquake	—	—	140 km

Source: NOAA/NCEI Historical Tsunami Database.

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: HENNESSEY (314,241 acres, 2020).

Year	Name	Acres Burned	Distance
2020	HENNESSEY	314,241	37 km
2015	ROCKY	96,125	62 km
2018	COUNTY	92,450	50 km
1996	FORK	83,209	96 km
2019	KINCADE	77,780	41 km
2015	VALLEY	77,507	49 km
2020	GLASS	68,020	22 km
2017	NUNS	56,883	4 km
2020	WALLBRIDGE	55,194	50 km
2017	ATLAS	51,664	27 km
2018	RIVER	48,920	88 km
2004	RUMSEY	39,335	50 km
1999	SIXTEEN	37,162	53 km
2017	TUBBS	36,981	27 km
1988	MILLER	35,750	40 km
2017	POCKET	18,691	55 km
2012	SIXTEEN COMPLEX	18,191	76 km
2006	ZAM ASSIST	14,404	71 km
2008	WALKER	12,441	79 km
2004	GEYSERS	12,075	45 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	48°F (9°C)	8.1 in	Wettest
February	50°F (10°C)	6.5 in
March	51°F (11°C)	5.4 in
April	55°F (13°C)	2.2 in
May	60°F (15°C)	0.8 in
June	65°F (18°C)	0.2 in
July	67°F (19°C)	0.0 in	Driest
August	69°F (20°C)	0.1 in	Warmest
September	67°F (19°C)	0.5 in
October	61°F (16°C)	2.2 in
November	52°F (11°C)	5.5 in
December	47°F (8°C)	6.2 in	Coldest

Glen Ellen has a seasonal temperature swing of 22°F / from 47°F in December to 69°F in August. Total annual precipitation is 37.7 inches, with January being the wettest month (8.1") and July the driest (0.0").

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