Weather & Climate in Deer Park, CA

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

Deer Park enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 50°F in January while summers reach 72°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 34.0 inches. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 640 feet.

Temperature

50°F Jan (10°C) 72°F Jul (22°C)

Annual Average	61.0°F
	13% above US avg
January Average	50°F (10°C)
July Average	72°F (22°C)
Sunny Days	302 days/yr

Geography

Elevation	640 ft (195 m)
Area	5.6 sq mi (14.5 km²)
Population Density	132/sq mi
Coordinates	38.5352°N, 122.4702°W
Timezone	America/Los_Angeles
County	Napa County County
Nearest Airport	Sacramento International (SMF) 49 miles away

Precipitation & Snow

Annual Rainfall 34.0"

11% below US avg

Snowfall 0.0"

Wettest Month (Jan) 7.48"

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

4,240 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	38 km	11 km
Aug 10, 2016	20 km NNE of Upper Lake, California	M5.1	93 km	14 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	18 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	29 km	7 km
Apr 18, 2007	15 km N of Potter Valley, California	M4.8	117 km	5 km
May 12, 2006	7 km W of Cobb, California	M4.7	43 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	146 km	8 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	43 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	72 km	8 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	47 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	42 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	43 km	2 km
Sep 25, 2012	3 km N of Talmage, California	M4.5	93 km	11 km
Aug 3, 2006	5 km W of Glen Ellen, California	M4.5	22 km	9 km
Jun 8, 2024	7 km NW of The Geysers, CA	M4.5	44 km	4 km
Sep 19, 1992	7 km NW of Cobb, California	M4.5	46 km	3 km
Apr 24, 2007	7 km WSW of Cobb, California	M4.5	40 km	2 km
Jun 3, 2023	2km NW of The Geysers, CA	M4.5	39 km	4 km
Mar 14, 2013	5 km W of Cobb, California	M4.4	41 km	1 km
Mar 1, 2011	8 km W of Cobb, California	M4.4	44 km	2 km

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

Tornado History

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

Date	Rating	Distance	Path	Fatalities
Feb 7, 1978	EF2	91 km	1.9 mi	0
Jun 1, 1958	EF2	53 km	15.0 mi	0
Oct 22, 2012	EF1	94 km	2.0 mi	0
Mar 18, 2011	EF1	23 km	0.1 mi	0
Jan 23, 2010	EF1	93 km	1.6 mi	0
Mar 20, 2005	EF1	99 km	3.0 mi	0
Jan 27, 2005	EF1	57 km	0.5 mi	0
Dec 5, 1998	EF1	22 km	1.5 mi	0
Dec 23, 1996	EF1	51 km	6.0 mi	0
Feb 22, 1996	EF1	23 km	1.0 mi	0
Dec 2, 1992	EF1	40 km	7.5 mi	0
Dec 2, 1992	EF1	35 km	1.0 mi	0
Dec 2, 1992	EF1	31 km	3.0 mi	0
Mar 22, 1983	EF1	100 km	2.0 mi	0
Feb 27, 1983	EF1	22 km	0.8 mi	0
Nov 10, 1964	EF1	29 km	1.0 mi	0
Feb 17, 1959	EF1	68 km	0.5 mi	0
Sep 28, 2019	EF0	63 km	1.7 mi	0
Feb 2, 2019	EF0	91 km	0.3 mi	0
Feb 2, 2019	EF0	99 km	0.1 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	98 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	116 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	93 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (55 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	55 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	86 km
2020	HENNESSEY	314,241	19 km
2015	ROCKY	96,125	42 km
2018	COUNTY	92,450	32 km
1996	FORK	83,209	78 km
2019	KINCADE	77,780	31 km
2015	VALLEY	77,507	31 km
2020	GLASS	68,020	7 km
2017	NUNS	56,883	21 km
2020	WALLBRIDGE	55,194	48 km
2017	ATLAS	51,664	28 km
2018	RIVER	48,920	75 km
2004	RUMSEY	39,335	30 km
1999	SIXTEEN	37,162	32 km
2017	TUBBS	36,981	19 km
1988	MILLER	35,750	35 km
2012	MILL	29,924	88 km
2001	TROUGH	25,270	98 km
2017	POCKET	18,691	44 km
2012	SIXTEEN COMPLEX	18,191	55 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	50°F (10°C)	7.5 in	Wettest
February	49°F (9°C)	5.8 in
March	51°F (11°C)	4.7 in
April	55°F (13°C)	1.9 in
May	62°F (16°C)	0.6 in
June	68°F (20°C)	0.2 in
July	72°F (22°C)	0.0 in	Warmest, Driest
August	72°F (22°C)	0.1 in
September	68°F (20°C)	0.5 in
October	62°F (16°C)	1.9 in
November	52°F (11°C)	5.0 in
December	46°F (8°C)	5.7 in	Coldest

Deer Park has a seasonal temperature swing of 27°F / from 46°F in December to 72°F in July. Total annual precipitation is 34.0 inches, with January being the wettest month (7.5") and July the driest (0.0").

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