Weather & Climate in Bloomfield, CA

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

Bloomfield 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 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 39.9 inches. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 180 feet.

Temperature

48°F Jan (9°C) 67°F Jul (19°C)

Annual Average	57.9°F
	7% above US avg
January Average	48°F (9°C)
July Average	67°F (19°C)
Sunny Days	302 days/yr

Geography

Elevation	180 ft (55 m)
Area	8.1 sq mi (21.1 km²)
Population Density	36/sq mi
Coordinates	38.3221°N, 122.8345°W
Timezone	America/Los_Angeles
County	Sonoma County County
Nearest Airport	Metro Oakland International (OAK) 53 miles away

Precipitation & Snow

Annual Rainfall 39.9"

5% above US avg

Snowfall 0.0"

Wettest Month (Jan) 8.03"

Driest Month (Jul) 0.08"

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

4,100 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	47 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	37 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	41 km	7 km
Apr 18, 2007	15 km N of Potter Valley, California	M4.8	129 km	5 km
May 12, 2006	7 km W of Cobb, California	M4.7	55 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	145 km	8 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	59 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	48 km	8 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	50 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	58 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	55 km	2 km
Sep 25, 2012	3 km N of Talmage, California	M4.5	98 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	55 km	4 km
Sep 19, 1992	7 km NW of Cobb, California	M4.5	60 km	3 km
Apr 24, 2007	7 km WSW of Cobb, California	M4.5	53 km	2 km
Jun 3, 2023	2km NW of The Geysers, CA	M4.5	53 km	4 km
Mar 14, 2013	5 km W of Cobb, California	M4.4	55 km	1 km
Mar 1, 2011	8 km W of Cobb, California	M4.4	55 km	2 km

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

Tornado History

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

Date	Rating	Distance	Path	Fatalities
Jun 1, 1958	EF2	14 km	15.0 mi	0
Mar 18, 2011	EF1	18 km	0.1 mi	0
Mar 20, 2005	EF1	83 km	3.0 mi	0
Jan 27, 2005	EF1	41 km	0.5 mi	0
Dec 5, 1998	EF1	18 km	1.5 mi	0
Dec 23, 1996	EF1	12 km	6.0 mi	0
Feb 22, 1996	EF1	27 km	1.0 mi	0
Dec 2, 1992	EF1	25 km	3.0 mi	0
Dec 2, 1992	EF1	9 km	1.0 mi	0
Dec 2, 1992	EF1	10 km	7.5 mi	0
Feb 27, 1983	EF1	18 km	0.8 mi	0
Nov 10, 1964	EF1	23 km	1.0 mi	0
Feb 17, 1959	EF1	42 km	0.5 mi	0
Apr 1, 1958	EF1	89 km	0.2 mi	0
Sep 28, 2019	EF0	99 km	1.7 mi	0
Apr 27, 2016	EF0	66 km	0.2 mi	0
Apr 7, 2011	EF0	63 km	0.1 mi	0
Mar 20, 2005	EF0	94 km	1.2 mi	0
Jan 11, 2005	EF0	75 km	0.1 mi	0
Dec 29, 2004	EF0	18 km	0.2 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	95 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	103 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	75 km
1865	N. CALIFORNIA	Eruption + Earthquake	—	—	149 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (72 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	72 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	59 km
2015	ROCKY	96,125	73 km
2018	COUNTY	92,450	72 km
1996	FORK	83,209	98 km
2019	KINCADE	77,780	39 km
2015	VALLEY	77,507	55 km
2020	GLASS	68,020	36 km
2017	NUNS	56,883	29 km
2020	WALLBRIDGE	55,194	36 km
2017	ATLAS	51,664	52 km
2018	RIVER	48,920	83 km
2004	RUMSEY	39,335	69 km
1999	SIXTEEN	37,162	69 km
2017	TUBBS	36,981	31 km
1988	MILLER	35,750	66 km
2017	POCKET	18,691	50 km
2012	SIXTEEN COMPLEX	18,191	89 km
2006	ZAM ASSIST	14,404	94 km
2008	WALKER	12,441	88 km
2004	GEYSERS	12,075	46 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	48°F (9°C)	8.0 in	Coldest, Wettest
February	51°F (11°C)	6.7 in
March	52°F (11°C)	5.6 in
April	55°F (13°C)	2.1 in
May	57°F (14°C)	0.8 in
June	61°F (16°C)	0.2 in
July	67°F (19°C)	0.1 in	Warmest, Driest
August	64°F (18°C)	0.2 in
September	64°F (18°C)	0.6 in
October	60°F (16°C)	2.3 in
November	53°F (12°C)	5.8 in
December	48°F (9°C)	6.3 in

Bloomfield has a seasonal temperature swing of 19°F / from 48°F in January to 67°F in July. Total annual precipitation is 38.7 inches, with January being the wettest month (8.0") and July the driest (0.1").

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