Weather & Climate in Moskowite Corner, CA

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

Moskowite Corner enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 47°F in January while summers reach 76°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 28.0 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 833 feet.

Temperature

47°F Jan (8°C) 76°F Jul (24°C)

Annual Average	60.6°F
	12% above US avg
January Average	47°F (8°C)
July Average	76°F (24°C)
Sunny Days	326 days/yr

Geography

Elevation	833 ft (254 m)
Area	2.8 sq mi (7.3 km²)
Population Density	48/sq mi
Coordinates	38.4439°N, 122.1920°W
Timezone	America/Los_Angeles
County	Napa County County
Nearest Airport	Sacramento International (SMF) 37 miles away

Precipitation & Snow

Annual Rainfall 28.0"

26% below US avg

Snowfall 0.0"

Wettest Month (Jan) 7.17"

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

4,310 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	28 km	11 km
Aug 10, 2016	20 km NNE of Upper Lake, California	M5.1	112 km	14 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	21 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	55 km	7 km
Apr 18, 2007	15 km N of Potter Valley, California	M4.8	138 km	5 km
May 12, 2006	7 km W of Cobb, California	M4.7	68 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	127 km	8 km
Aug 11, 1993	14 km ESE of Alum Rock, California	M4.7	134 km	9 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	66 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	74 km	8 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	72 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	66 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	68 km	2 km
Sep 19, 2023	15 km SW of Westley, CA	M4.5	137 km	4 km
Sep 25, 2012	3 km N of Talmage, California	M4.5	117 km	11 km
Aug 3, 2006	5 km W of Glen Ellen, California	M4.5	36 km	9 km
Jun 8, 2024	7 km NW of The Geysers, CA	M4.5	69 km	4 km
Sep 19, 1992	7 km NW of Cobb, California	M4.5	70 km	3 km
Apr 24, 2007	7 km WSW of Cobb, California	M4.5	65 km	2 km
Jun 3, 2023	2km NW of The Geysers, CA	M4.5	64 km	4 km

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

Tornado History

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

Date	Rating	Distance	Path	Fatalities
Feb 7, 1978	EF2	71 km	1.9 mi	0
Jun 1, 1958	EF2	71 km	15.0 mi	0
Dec 24, 2015	EF1	98 km	6.2 mi	0
Oct 22, 2012	EF1	84 km	2.0 mi	0
Oct 22, 2012	EF1	91 km	0.3 mi	0
Mar 18, 2011	EF1	45 km	0.1 mi	0
Jan 23, 2010	EF1	70 km	1.6 mi	0
Mar 20, 2005	EF1	91 km	3.0 mi	0
Jan 27, 2005	EF1	83 km	0.5 mi	0
Dec 5, 1998	EF1	44 km	1.5 mi	0
Dec 23, 1996	EF1	68 km	6.0 mi	0
Feb 22, 1996	EF1	48 km	1.0 mi	0
Dec 2, 1992	EF1	56 km	3.0 mi	0
Dec 2, 1992	EF1	62 km	7.5 mi	0
Dec 2, 1992	EF1	56 km	1.0 mi	0
Apr 19, 1988	EF1	93 km	1.0 mi	0
Apr 19, 1988	EF1	96 km	0.2 mi	0
Mar 22, 1983	EF1	79 km	2.0 mi	0
Feb 27, 1983	EF1	44 km	0.8 mi	0
May 31, 1967	EF1	94 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	—	105 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	87 km
1865	N. CALIFORNIA	Eruption + Earthquake	—	—	141 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (77 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	77 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	21 km
2015	ROCKY	96,125	57 km
2018	COUNTY	92,450	27 km
1996	FORK	83,209	97 km
2019	KINCADE	77,780	57 km
2015	VALLEY	77,507	53 km
2020	GLASS	68,020	33 km
2017	NUNS	56,883	29 km
2020	WALLBRIDGE	55,194	74 km
2017	ATLAS	51,664	10 km
2018	RIVER	48,920	99 km
2004	RUMSEY	39,335	36 km
1999	SIXTEEN	37,162	42 km
2017	TUBBS	36,981	45 km
1988	MILLER	35,750	9 km
2017	POCKET	18,691	70 km
2012	SIXTEEN COMPLEX	18,191	64 km
2006	ZAM ASSIST	14,404	43 km
2008	WALKER	12,441	74 km
2004	GEYSERS	12,075	58 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	47°F (8°C)	7.2 in	Wettest
February	49°F (9°C)	5.6 in
March	51°F (11°C)	4.6 in
April	56°F (13°C)	1.9 in
May	61°F (16°C)	0.6 in
June	67°F (20°C)	0.2 in
July	76°F (24°C)	0.0 in	Warmest, Driest
August	71°F (22°C)	0.1 in
September	69°F (20°C)	0.5 in
October	62°F (17°C)	1.9 in
November	52°F (11°C)	4.8 in
December	46°F (8°C)	5.4 in	Coldest

Moskowite Corner has a seasonal temperature swing of 30°F / from 46°F in December to 76°F in July. Total annual precipitation is 32.8 inches, with January being the wettest month (7.2") and July the driest (0.0").

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