Weather & Climate in Colusa, CA

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

Colusa enjoys a temperate climate with an average annual temperature of 62°F (16°C). Winters average 46°F in January while summers reach 76°F in July. The area gets 330 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 17.2 inches (drier than the 38-inch national average). Air quality is rated Moderate with a median AQI of 54. 19% of days have good air quality. The city sits at an elevation of 54 feet.

Temperature

46°F Jan (8°C) 76°F Jul (25°C)

Annual Average	61.5°F
	14% above US avg
January Average	46°F (8°C)
July Average	76°F (25°C)
Sunny Days	330 days/yr

Geography

Elevation	54 ft (16 m)
Area	1.8 sq mi (4.7 km²)
Population Density	1,477/sq mi
Coordinates	39.2000°N, 122.0095°W
Timezone	America/Los_Angeles
County	Colusa County County
Nearest Airport	Sacramento International (SMF) 41 miles away

Precipitation & Snow

Annual Rainfall 17.2"

55% below US avg

Snowfall 0.0"

Wettest Month (Jan) 3.35"

Driest Month (Jul) 0.04"

Air Quality

AQI Median	54.0
Rating	Moderate
Good Days %	18.6%
Unhealthy Days	0

Natural Hazard Risk

Overall Risk	Relatively Moderate
Risk Score	81.1 / 100
Social Vulnerability	49.5 / 100
Community Resilience	25.4 / 100

Hazard Breakdown

Tornado	Very Low
Earthquake	Relatively Moderate
Wildfire	Relatively Moderate
Flood	Relatively Low
Hail	Very Low
Strong Wind	Very Low
Heat Wave	Relatively Low
Winter Weather	Very Low
Lightning	Very Low
Drought	Very High
Cold Wave	No Rating
Landslide	Relatively Low
Volcano	Very Low
Avalanche	Very Low

Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

4,457 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	113 km	11 km
May 24, 2013	2 km NNE of Canyondam, California	M5.7	137 km	8 km
May 11, 2023	Lake Almanor Earthquake	M5.5	136 km	6 km
Aug 10, 2001	3 km N of Blairsden, California	M5.2	138 km	5 km
May 12, 2023	4km NW of Canyondam, CA	M5.2	135 km	6 km
Aug 10, 2016	20 km NNE of Upper Lake, California	M5.1	70 km	14 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	98 km	9 km
May 24, 2013	1km NNW of Canyondam, CA	M4.9	135 km	4 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	86 km	7 km
Apr 18, 2007	15 km N of Potter Valley, California	M4.8	99 km	5 km
May 12, 2006	7 km W of Cobb, California	M4.7	82 km	4 km
Jan 19, 2008	31 km NW of Rancho Tehama Reserve, California	M4.7	124 km	2 km
May 7, 2021	19km NW of Truckee, CA	M4.7	149 km	10 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	76 km	1 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	92 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	77 km	3 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	82 km	2 km
Sep 25, 2012	3 km N of Talmage, California	M4.5	100 km	11 km
Aug 3, 2006	5 km W of Glen Ellen, California	M4.5	106 km	9 km
Jan 19, 2008	34 km WNW of Rancho Tehama Reserve, California	M4.5	125 km	10 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: 7 injuries.

Date	Rating	Distance	Path	Fatalities
May 25, 2011	EF2	55 km	0.2 mi	0
Feb 10, 1994	EF2	52 km	0.3 mi	0
Sep 24, 1986	EF2	81 km	2.0 mi	0
Feb 7, 1978	EF2	74 km	1.9 mi	0
May 19, 1953	EF2	63 km	2.0 mi	0
Dec 19, 2023	EF1	69 km	0.4 mi	0
Dec 24, 2015	EF1	95 km	6.2 mi	0
Mar 26, 2014	EF1	44 km	0.7 mi	0
Mar 26, 2014	EF1	44 km	0.6 mi	0
Mar 26, 2014	EF1	42 km	1.0 mi	0
Oct 22, 2012	EF1	81 km	4.0 mi	0
Oct 22, 2012	EF1	36 km	2.0 mi	0
Oct 22, 2012	EF1	44 km	0.3 mi	0
May 25, 2011	EF1	49 km	21.7 mi	0
May 25, 2011	EF1	39 km	26.4 mi	0
Jan 8, 2005	EF1	47 km	0.1 mi	0
Feb 22, 1996	EF1	96 km	1.0 mi	0
Apr 17, 1993	EF1	38 km	0.5 mi	0
Jan 7, 1993	EF1	35 km	0.1 mi	0
Dec 17, 1992	EF1	52 km	1.0 mi	0

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

Nearby Volcanoes

2 volcanoes within 200 km. Closest: Clear Lake (70 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	70 km
Lassen Volcanic Center	Stratovolcano	3,187 m (10,456 ft)	1917	150 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	66 km
2020	NORTH COMPLEX	316,556	96 km
2020	HENNESSEY	314,241	68 km
2018	CAMP	153,687	72 km
1990	CAMPBELL	128,266	95 km
2015	ROCKY	96,125	50 km
2018	COUNTY	92,450	59 km
1996	FORK	83,209	63 km
2019	KINCADE	77,780	89 km
2015	VALLEY	77,507	69 km
2020	GLASS	68,020	86 km
1987	MENDENHALL	54,162	96 km
2008	BTU LIGHTNING COMPLEX (LONG BRANCH-JACK)	52,091	87 km
2017	ATLAS	51,664	95 km
2018	RIVER	48,920	89 km
2004	RUMSEY	39,335	54 km
1999	SIXTEEN	37,162	52 km
2017	TUBBS	36,981	91 km
1988	49R	36,673	69 km
1988	MILLER	35,750	86 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	46°F (8°C)	3.4 in	Wettest
February	51°F (11°C)	2.8 in
March	55°F (13°C)	2.4 in
April	60°F (15°C)	0.9 in
May	67°F (19°C)	0.4 in
June	73°F (23°C)	0.2 in
July	76°F (25°C)	0.0 in	Warmest, Driest
August	74°F (23°C)	0.1 in
September	71°F (21°C)	0.4 in
October	64°F (18°C)	1.1 in
November	53°F (11°C)	2.6 in
December	46°F (8°C)	2.5 in	Coldest

Colusa has a seasonal temperature swing of 30°F / from 46°F in December to 76°F in July. Total annual precipitation is 16.6 inches, with January being the wettest month (3.4") and July the driest (0.0").

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