Weather & Climate in American Canyon, CA

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

American Canyon enjoys a temperate climate with an average annual temperature of 58°F (14°C). Winters average 48°F in January while summers reach 67°F in July / relatively mild seasonal variation. 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 20.2 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 71 feet.

Temperature

48°F Jan (9°C) 67°F Jul (19°C)

Annual Average	57.7°F
	7% above US avg
January Average	48°F (9°C)
July Average	67°F (19°C)
Sunny Days	326 days/yr

Geography

Elevation	71 ft (22 m)
Area	4.8 sq mi (12.5 km²)
Population Density	3,569/sq mi
Coordinates	38.1790°N, 122.2596°W
Timezone	America/Los_Angeles
County	Napa County County
Nearest Airport	Metro Oakland International (OAK) 32 miles away

Precipitation & Snow

Annual Rainfall 20.2"

47% below US avg

Wettest Month (Jan) 6.14"

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

4,371 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	6 km	11 km
Apr 18, 1990	5 km NNW of Aromas, California	M5.4	149 km	5 km
Apr 18, 1990	4 km E of Interlaken, California	M5.1	145 km	7 km
Aug 10, 2016	20 km NNE of Upper Lake, California	M5.1	136 km	14 km
Jan 16, 1993	9 km E of Gilroy, California	M4.9	147 km	7 km
May 14, 2002	5 km SSW of Gilroy, California	M4.9	147 km	7 km
Apr 18, 1990	4 km NNW of Aromas, California	M4.9	149 km	6 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	26 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	70 km	7 km
May 12, 2006	7 km W of Cobb, California	M4.7	86 km	4 km
Apr 18, 1990	4 km N of Aromas, California	M4.7	149 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	103 km	8 km
Aug 11, 1993	14 km ESE of Alum Rock, California	M4.7	109 km	9 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	86 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	48 km	8 km
Mar 24, 1991	1 km NNE of Interlaken, California	M4.6	143 km	15 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	87 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	85 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	86 km	2 km
Sep 19, 2023	15 km SW of Westley, CA	M4.5	118 km	4 km

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

Tornado History

71 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 4 injuries.

Date	Rating	Distance	Path	Fatalities
May 5, 1998	EF2	92 km	0.6 mi	0
Feb 7, 1978	EF2	91 km	1.9 mi	0
Jun 1, 1958	EF2	64 km	15.0 mi	0
Jan 11, 1951	EF2	91 km	5.7 mi	0
Mar 18, 2011	EF1	50 km	0.1 mi	0
Jan 23, 2010	EF1	52 km	1.6 mi	0
Mar 20, 2005	EF1	61 km	3.0 mi	0
Jan 27, 2005	EF1	90 km	0.5 mi	0
Dec 5, 1998	EF1	49 km	1.5 mi	0
May 5, 1998	EF1	90 km	0.3 mi	0
Dec 23, 1996	EF1	59 km	6.0 mi	0
Feb 22, 1996	EF1	58 km	1.0 mi	0
Dec 2, 1992	EF1	64 km	3.0 mi	0
Dec 2, 1992	EF1	61 km	7.5 mi	0
Dec 2, 1992	EF1	56 km	1.0 mi	0
Apr 19, 1988	EF1	97 km	0.2 mi	0
Mar 22, 1983	EF1	100 km	2.0 mi	0
Feb 27, 1983	EF1	49 km	0.8 mi	0
Jan 14, 1980	EF1	85 km	0.3 mi	0
May 31, 1967	EF1	87 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	55 km
1989	N. CALIFORNIA	Earthquake	1.0 m	62	131 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	76 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	57 km
1865	N. CALIFORNIA	Eruption + Earthquake	—	—	113 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (99 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	99 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	49 km
2015	ROCKY	96,125	83 km
2018	COUNTY	92,450	57 km
2019	KINCADE	77,780	71 km
2015	VALLEY	77,507	74 km
2020	GLASS	68,020	49 km
2017	NUNS	56,883	28 km
2020	WALLBRIDGE	55,194	82 km
2017	ATLAS	51,664	21 km
2004	RUMSEY	39,335	64 km
1999	SIXTEEN	37,162	70 km
2017	TUBBS	36,981	57 km
1988	MILLER	35,750	31 km
2017	POCKET	18,691	85 km
2012	SIXTEEN COMPLEX	18,191	93 km
2024	CORRAL	16,138	93 km
2006	ZAM ASSIST	14,404	71 km
2004	GEYSERS	12,075	74 km
2009	CORRAL	12,006	94 km
1995	VISION	11,931	55 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	48°F (9°C)	6.1 in	Wettest
February	51°F (10°C)	5.2 in
March	53°F (12°C)	4.2 in
April	57°F (14°C)	1.5 in
May	62°F (17°C)	0.7 in
June	67°F (20°C)	0.2 in
July	67°F (19°C)	0.0 in	Driest
August	70°F (21°C)	0.1 in	Warmest
September	69°F (20°C)	0.4 in
October	63°F (17°C)	1.6 in
November	53°F (12°C)	4.1 in
December	47°F (8°C)	4.5 in	Coldest

American Canyon has a seasonal temperature swing of 24°F / from 47°F in December to 70°F in August. Total annual precipitation is 28.7 inches, with January being the wettest month (6.1") and July the driest (0.0").

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