Weather & Climate in Hidden Valley Lake, CA

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

Hidden Valley Lake 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 1,117 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	1,117 ft (340 m)
Area	9.8 sq mi (25.4 km²)
Population Density	600/sq mi
Coordinates	38.8015°N, 122.5514°W
Timezone	America/Los_Angeles
County	Napa County County
Nearest Airport	Sacramento International (SMF) 52 miles away

Precipitation & Snow

Annual Rainfall 29.9"

21% below US avg

Snowfall 0.4"

Wettest Month (Jan) 8.46"

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

4,069 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	68 km	11 km
Aug 10, 2016	20 km NNE of Upper Lake, California	M5.1	63 km	14 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	49 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	21 km	7 km
Apr 18, 2007	15 km N of Potter Valley, California	M4.8	88 km	5 km
May 12, 2006	7 km W of Cobb, California	M4.7	23 km	4 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	18 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	100 km	8 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	32 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	19 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	23 km	2 km
Sep 25, 2012	3 km N of Talmage, California	M4.5	67 km	11 km
Aug 3, 2006	5 km W of Glen Ellen, California	M4.5	49 km	9 km
Jun 8, 2024	7 km NW of The Geysers, CA	M4.5	24 km	4 km
Sep 19, 1992	7 km NW of Cobb, California	M4.5	22 km	3 km
Apr 24, 2007	7 km WSW of Cobb, California	M4.5	21 km	2 km
Jun 3, 2023	2km NW of The Geysers, CA	M4.5	20 km	4 km
Mar 14, 2013	5 km W of Cobb, California	M4.4	20 km	1 km
Mar 1, 2011	8 km W of Cobb, California	M4.4	23 km	2 km
Apr 12, 2023	7km WNW of Cobb, CA	M4.4	22 km	2 km

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

Tornado History

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

Date	Rating	Distance	Path	Fatalities
Feb 7, 1978	EF2	96 km	1.9 mi	0
Jun 1, 1958	EF2	69 km	15.0 mi	0
Mar 26, 2014	EF1	94 km	0.6 mi	0
Mar 26, 2014	EF1	96 km	0.7 mi	0
Mar 26, 2014	EF1	94 km	1.0 mi	0
Oct 22, 2012	EF1	94 km	0.3 mi	0
Oct 22, 2012	EF1	85 km	2.0 mi	0
May 25, 2011	EF1	85 km	26.4 mi	0
May 25, 2011	EF1	97 km	21.7 mi	0
Mar 18, 2011	EF1	41 km	0.1 mi	0
Jan 27, 2005	EF1	53 km	0.5 mi	0
Dec 5, 1998	EF1	41 km	1.5 mi	0
Dec 23, 1996	EF1	70 km	6.0 mi	0
Feb 22, 1996	EF1	32 km	1.0 mi	0
Apr 17, 1993	EF1	89 km	0.5 mi	0
Jan 7, 1993	EF1	99 km	0.1 mi	0
Dec 2, 1992	EF1	51 km	1.0 mi	0
Dec 2, 1992	EF1	54 km	7.5 mi	0
Dec 2, 1992	EF1	36 km	3.0 mi	0
Feb 27, 1983	EF1	41 km	0.8 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	129 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	146 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	123 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (27 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	27 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	56 km
2020	HENNESSEY	314,241	31 km
2015	ROCKY	96,125	15 km
2018	COUNTY	92,450	37 km
1996	FORK	83,209	48 km
2019	KINCADE	77,780	24 km
2015	VALLEY	77,507	6 km
2020	GLASS	68,020	28 km
2017	NUNS	56,883	51 km
2020	WALLBRIDGE	55,194	44 km
1987	MENDENHALL	54,162	92 km
2017	ATLAS	51,664	56 km
2018	RIVER	48,920	49 km
2004	RUMSEY	39,335	25 km
1999	SIXTEEN	37,162	19 km
2017	TUBBS	36,981	28 km
2017	REDWOOD VALLEY INCIDENT	36,545	83 km
1988	MILLER	35,750	57 km
2012	MILL	29,924	58 km
2001	TROUGH	25,270	68 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	44°F (7°C)	8.5 in	Coldest, Wettest
February	47°F (8°C)	6.3 in
March	49°F (10°C)	5.4 in
April	53°F (12°C)	2.4 in
May	60°F (15°C)	0.6 in
June	67°F (19°C)	0.2 in
July	74°F (23°C)	0.0 in	Warmest, Driest
August	72°F (22°C)	0.2 in
September	68°F (20°C)	0.6 in
October	60°F (16°C)	2.2 in
November	50°F (10°C)	5.8 in
December	45°F (7°C)	6.7 in

Hidden Valley Lake has a seasonal temperature swing of 30°F / from 44°F in January to 74°F in July. Total annual precipitation is 38.9 inches, with January being the wettest month (8.5") and July the driest (0.0").

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