Weather & Climate in Green Valley CDP (Solano County), CA

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

Green Valley CDP (Solano County) enjoys a temperate climate with an average annual temperature of 62°F (17°C). Winters average 49°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 24.5 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 296 feet.

Temperature

49°F Jan (9°C) 74°F Jul (23°C)

Annual Average	61.7°F
	14% above US avg
January Average	49°F (9°C)
July Average	74°F (23°C)
Sunny Days	326 days/yr

Geography

Elevation	296 ft (90 m)
Area	8.4 sq mi (21.7 km²)
Population Density	172/sq mi
Coordinates	38.2638°N, 122.1625°W
Timezone	America/Los_Angeles
County	Napa County County
Nearest Airport	Metro Oakland International (OAK) 38 miles away

Precipitation & Snow

Annual Rainfall 24.5"

35% below US avg

Snowfall 0.0"

Wettest Month (Jan) 5.35"

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

4,261 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	14 km	11 km
Aug 10, 2016	20 km NNE of Upper Lake, California	M5.1	131 km	14 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	25 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	69 km	7 km
May 12, 2006	7 km W of Cobb, California	M4.7	84 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	108 km	8 km
Aug 11, 1993	14 km ESE of Alum Rock, California	M4.7	114 km	9 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	83 km	1 km
Mar 24, 1991	1 km NNE of Interlaken, California	M4.6	149 km	15 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	61 km	8 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	86 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	83 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	84 km	2 km
Sep 19, 2023	15 km SW of Westley, CA	M4.5	119 km	4 km
Sep 25, 2012	3 km N of Talmage, California	M4.5	133 km	11 km
Aug 3, 2006	5 km W of Glen Ellen, California	M4.5	39 km	9 km
Jun 8, 2024	7 km NW of The Geysers, CA	M4.5	84 km	4 km
Sep 19, 1992	7 km NW of Cobb, California	M4.5	86 km	3 km
Apr 24, 2007	7 km WSW of Cobb, California	M4.5	81 km	2 km
Jun 3, 2023	2km NW of The Geysers, CA	M4.5	80 km	4 km

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

Tornado History

76 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 3 injuries.

Date	Rating	Distance	Path	Fatalities
Feb 7, 1978	EF2	79 km	1.9 mi	0
Jun 1, 1958	EF2	71 km	15.0 mi	0
Jan 11, 1951	EF2	100 km	5.7 mi	0
Mar 18, 2011	EF1	52 km	0.1 mi	0
Jan 23, 2010	EF1	52 km	1.6 mi	0
Mar 20, 2005	EF1	72 km	3.0 mi	0
Jan 27, 2005	EF1	92 km	0.5 mi	0
Dec 5, 1998	EF1	51 km	1.5 mi	0
May 5, 1998	EF1	98 km	0.3 mi	0
Dec 23, 1996	EF1	67 km	6.0 mi	0
Feb 22, 1996	EF1	59 km	1.0 mi	0
Dec 2, 1992	EF1	66 km	7.5 mi	0
Dec 2, 1992	EF1	66 km	3.0 mi	0
Dec 2, 1992	EF1	60 km	1.0 mi	0
Apr 19, 1988	EF1	89 km	0.2 mi	0
Apr 19, 1988	EF1	98 km	1.0 mi	0
Mar 22, 1983	EF1	87 km	2.0 mi	0
Feb 27, 1983	EF1	51 km	0.8 mi	0
Jan 14, 1980	EF1	91 km	0.3 mi	0
May 31, 1967	EF1	82 km	0.1 mi	0

Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Tsunami History

5 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	63 km
1989	N. CALIFORNIA	Earthquake	1.0 m	62	139 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	86 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	69 km
1865	N. CALIFORNIA	Eruption + Earthquake	—	—	121 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (95 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	95 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	41 km
2015	ROCKY	96,125	76 km
2018	COUNTY	92,450	47 km
2019	KINCADE	77,780	70 km
2015	VALLEY	77,507	70 km
2020	GLASS	68,020	46 km
2017	NUNS	56,883	31 km
2020	WALLBRIDGE	55,194	84 km
2017	ATLAS	51,664	13 km
2004	RUMSEY	39,335	56 km
1999	SIXTEEN	37,162	62 km
2017	TUBBS	36,981	56 km
1988	MILLER	35,750	19 km
2017	POCKET	18,691	84 km
2012	SIXTEEN COMPLEX	18,191	84 km
2024	CORRAL	16,138	93 km
2006	ZAM ASSIST	14,404	59 km
2008	WALKER	12,441	93 km
2004	GEYSERS	12,075	73 km
2009	CORRAL	12,006	95 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	49°F (9°C)	5.4 in	Wettest
February	51°F (11°C)	4.5 in
March	54°F (12°C)	3.5 in
April	58°F (15°C)	1.2 in
May	64°F (18°C)	0.6 in
June	69°F (21°C)	0.1 in
July	74°F (23°C)	0.0 in	Warmest, Driest
August	72°F (22°C)	0.1 in
September	70°F (21°C)	0.3 in
October	64°F (18°C)	1.3 in
November	54°F (12°C)	3.4 in
December	47°F (8°C)	3.7 in	Coldest

Green Valley CDP (Solano County) has a seasonal temperature swing of 27°F / from 47°F in December to 74°F in July. Total annual precipitation is 24.1 inches, with January being the wettest month (5.4") and July the driest (0.0").

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