Weather & Climate in Rumsey, CA

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

Rumsey enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 47°F in January while summers reach 69°F in July. 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 39.7 inches. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 426 feet.

Temperature

47°F Jan (8°C) 69°F Jul (21°C)

Annual Average	57.4°F
	6% above US avg
January Average	47°F (8°C)
July Average	69°F (21°C)
Sunny Days	302 days/yr

Geography

Elevation	426 ft (130 m)
Area	2.5 sq mi (6.3 km²)
Population Density	46/sq mi
Coordinates	38.8933°N, 122.2436°W
Timezone	America/Los_Angeles
County	Napa County County
Nearest Airport	Sacramento International (SMF) 38 miles away

Precipitation & Snow

Annual Rainfall 39.7"

5% above US avg

Wettest Month (Jan) 5.67"

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

4,118 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	68 km	14 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	59 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	49 km	7 km
Apr 18, 2007	15 km N of Potter Valley, California	M4.8	98 km	5 km
May 12, 2006	7 km W of Cobb, California	M4.7	50 km	4 km
Jan 19, 2008	31 km NW of Rancho Tehama Reserve, California	M4.7	148 km	2 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	45 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	116 km	8 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	60 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	46 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	50 km	2 km
Sep 25, 2012	3 km N of Talmage, California	M4.5	85 km	11 km
Jan 19, 2008	34 km WNW of Rancho Tehama Reserve, California	M4.5	148 km	10 km
Aug 3, 2006	5 km W of Glen Ellen, California	M4.5	66 km	9 km
Jun 8, 2024	7 km NW of The Geysers, CA	M4.5	51 km	4 km
Sep 19, 1992	7 km NW of Cobb, California	M4.5	48 km	3 km
Apr 24, 2007	7 km WSW of Cobb, California	M4.5	49 km	2 km
Jun 3, 2023	2km NW of The Geysers, CA	M4.5	48 km	4 km
Mar 14, 2013	5 km W of Cobb, California	M4.4	48 km	1 km

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

Tornado History

80 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 7 injuries.

Date	Rating	Distance	Path	Fatalities
May 25, 2011	EF2	95 km	0.2 mi	0
Feb 10, 1994	EF2	91 km	0.3 mi	0
Feb 7, 1978	EF2	72 km	1.9 mi	0
Jun 1, 1958	EF2	94 km	15.0 mi	0
May 19, 1953	EF2	95 km	2.0 mi	0
Dec 24, 2015	EF1	100 km	6.2 mi	0
Mar 26, 2014	EF1	79 km	0.7 mi	0
Mar 26, 2014	EF1	77 km	0.6 mi	0
Mar 26, 2014	EF1	77 km	1.0 mi	0
Oct 22, 2012	EF1	56 km	2.0 mi	0
Oct 22, 2012	EF1	65 km	0.3 mi	0
May 25, 2011	EF1	81 km	21.7 mi	0
May 25, 2011	EF1	70 km	26.4 mi	0
Mar 18, 2011	EF1	64 km	0.1 mi	0
Jan 27, 2005	EF1	82 km	0.5 mi	0
Jan 8, 2005	EF1	85 km	0.1 mi	0
Dec 5, 1998	EF1	63 km	1.5 mi	0
Dec 23, 1996	EF1	93 km	6.0 mi	0
Feb 22, 1996	EF1	57 km	1.0 mi	0
Apr 17, 1993	EF1	72 km	0.5 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	133 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	135 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

2 volcanoes within 200 km. Closest: Clear Lake (46 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	46 km
Lassen Volcanic Center	Stratovolcano	3,187 m (10,456 ft)	1917	189 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	30 km
2015	ROCKY	96,125	18 km
2018	COUNTY	92,450	25 km
1996	FORK	83,209	55 km
2019	KINCADE	77,780	52 km
2015	VALLEY	77,507	34 km
2020	GLASS	68,020	46 km
2017	NUNS	56,883	65 km
2020	WALLBRIDGE	55,194	73 km
1987	MENDENHALL	54,162	100 km
2017	ATLAS	51,664	59 km
2018	RIVER	48,920	69 km
2004	RUMSEY	39,335	15 km
1999	SIXTEEN	37,162	12 km
2017	TUBBS	36,981	52 km
1988	49R	36,673	98 km
2017	REDWOOD VALLEY INCIDENT	36,545	97 km
1988	MILLER	35,750	53 km
2012	MILL	29,924	58 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	47°F (8°C)	5.7 in	Wettest
February	48°F (9°C)	4.4 in
March	51°F (10°C)	3.6 in
April	56°F (13°C)	1.6 in
May	63°F (17°C)	0.4 in
June	71°F (22°C)	0.2 in
July	69°F (21°C)	0.0 in	Driest
August	75°F (24°C)	0.1 in	Warmest
September	71°F (22°C)	0.5 in
October	63°F (17°C)	1.7 in
November	51°F (11°C)	4.3 in
December	45°F (7°C)	4.7 in	Coldest

Rumsey has a seasonal temperature swing of 30°F / from 45°F in December to 75°F in August. Total annual precipitation is 27.1 inches, with January being the wettest month (5.7") and July the driest (0.0").

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