Weather & Climate in Middletown, CA

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

Middletown enjoys a temperate climate with an average annual temperature of 60°F (16°C). Winters average 49°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 38.6 inches. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 1,107 feet.

Temperature

49°F Jan (10°C) 72°F Jul (22°C)

Annual Average	60.1°F
	11% above US avg
January Average	49°F (10°C)
July Average	72°F (22°C)
Sunny Days	302 days/yr

Geography

Elevation	1,107 ft (337 m)
Area	1.8 sq mi (4.8 km²)
Population Density	902/sq mi
Coordinates	38.7519°N, 122.6221°W
Timezone	America/Los_Angeles
County	Sonoma County County
Nearest Airport	Sacramento International (SMF) 56 miles away

Precipitation & Snow

Annual Rainfall 38.6"

2% above US avg

Snowfall 0.0"

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	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

4,068 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	66 km	11 km
Aug 10, 2016	20 km NNE of Upper Lake, California	M5.1	66 km	14 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	45 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	13 km	7 km
Apr 18, 2007	15 km N of Potter Valley, California	M4.8	90 km	5 km
May 12, 2006	7 km W of Cobb, California	M4.7	18 km	4 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	16 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	94 km	8 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	25 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	16 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	18 km	2 km
Sep 25, 2012	3 km N of Talmage, California	M4.5	66 km	11 km
Aug 3, 2006	5 km W of Glen Ellen, California	M4.5	43 km	9 km
Jun 8, 2024	7 km NW of The Geysers, CA	M4.5	19 km	4 km
Sep 19, 1992	7 km NW of Cobb, California	M4.5	19 km	3 km
Apr 24, 2007	7 km WSW of Cobb, California	M4.5	16 km	2 km
Jun 3, 2023	2km NW of The Geysers, CA	M4.5	14 km	4 km
Mar 14, 2013	5 km W of Cobb, California	M4.4	16 km	1 km
Mar 1, 2011	8 km W of Cobb, California	M4.4	19 km	2 km
Apr 12, 2023	7km WNW of Cobb, CA	M4.4	19 km	2 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	61 km	15.0 mi	0
Oct 22, 2012	EF1	93 km	2.0 mi	0
May 25, 2011	EF1	93 km	26.4 mi	0
Mar 18, 2011	EF1	34 km	0.1 mi	0
Jan 27, 2005	EF1	46 km	0.5 mi	0
Dec 5, 1998	EF1	34 km	1.5 mi	0
Dec 23, 1996	EF1	62 km	6.0 mi	0
Feb 22, 1996	EF1	24 km	1.0 mi	0
Apr 17, 1993	EF1	96 km	0.5 mi	0
Dec 2, 1992	EF1	46 km	7.5 mi	0
Dec 2, 1992	EF1	43 km	1.0 mi	0
Dec 2, 1992	EF1	28 km	3.0 mi	0
Feb 27, 1983	EF1	34 km	0.8 mi	0
Jun 28, 1970	EF1	97 km	2.3 mi	0
Nov 10, 1964	EF1	29 km	1.0 mi	0
Feb 17, 1959	EF1	60 km	0.5 mi	0
Sep 28, 2019	EF0	78 km	1.7 mi	0
Feb 2, 2019	EF0	90 km	0.3 mi	0
Feb 2, 2019	EF0	86 km	0.1 mi	0
Apr 27, 2016	EF0	51 km	0.2 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	126 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	142 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	117 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	59 km
2020	HENNESSEY	314,241	33 km
2015	ROCKY	96,125	23 km
2018	COUNTY	92,450	41 km
1996	FORK	83,209	51 km
2019	KINCADE	77,780	16 km
2015	VALLEY	77,507	4 km
2020	GLASS	68,020	23 km
2017	NUNS	56,883	46 km
2020	WALLBRIDGE	55,194	37 km
1987	MENDENHALL	54,162	95 km
2017	ATLAS	51,664	55 km
2018	RIVER	48,920	48 km
2004	RUMSEY	39,335	30 km
1999	SIXTEEN	37,162	26 km
2017	TUBBS	36,981	21 km
2017	REDWOOD VALLEY INCIDENT	36,545	83 km
1988	MILLER	35,750	58 km
2012	MILL	29,924	63 km
2001	TROUGH	25,270	72 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	49°F (10°C)	8.5 in	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	72°F (22°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	Coldest

Middletown has a seasonal temperature swing of 28°F / from 45°F in December to 72°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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