Weather & Climate in Folsom, CA

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

Folsom enjoys a temperate climate with an average annual temperature of 60°F (16°C). Winters average 47°F in January while summers reach 79°F in July. The area gets 315 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 36.1 inches. The area receives 3.4 inches of snow annually. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 325 feet.

Temperature

47°F Jan (8°C) 79°F Jul (26°C)

Annual Average	60.4°F
	12% above US avg
January Average	47°F (8°C)
July Average	79°F (26°C)
Sunny Days	315 days/yr

Geography

Elevation	325 ft (99 m)
Area	24.3 sq mi (62.9 km²)
Population Density	2,946/sq mi
Coordinates	38.6666°N, 121.1416°W
Timezone	America/Los_Angeles
County	Sacramento County County
Nearest Airport	Sacramento International (SMF) 24 miles away

Precipitation & Snow

Annual Rainfall 36.1"

5% below US avg

Snowfall 3.4"

Wettest Month (Jan) 4.41"

Driest Month (Jul) 0.12"

Air Quality

AQI Median	48.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively High
Risk Score	98.1 / 100
Social Vulnerability	37.4 / 100
Community Resilience	57.0 / 100

Hazard Breakdown

Tornado	Relatively Moderate
Earthquake	Relatively High
Wildfire	Relatively Moderate
Flood	Relatively High
Hail	Relatively 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 Low
Coastal Flood	No Rating
Volcano	Very Low

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

Earthquake History

5,263 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.1.

Sep 12, 1994	4 km S of Carter Springs, Nevada	M6.1	130 km	14 km
Aug 24, 2014	The 2014 South Napa, California Earthquake	M6.0	114 km	11 km
Jul 8, 2021	Antelope Valley, CA	M6.0	144 km	7 km
Aug 10, 2001	3 km N of Blairsden, California	M5.2	135 km	5 km
Apr 26, 2008	1 km NW of Mogul, Nevada	M5.1	141 km	3 km
Sep 12, 1994	8 km ESE of Mesa Vista, California	M5.1	125 km	-1 km
Jul 8, 2021	32km SE of Markleeville, CA	M5.0	144 km	7 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	115 km	9 km
Dec 22, 1995	California-Nevada border region	M4.9	131 km	4 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	139 km	7 km
Apr 26, 2008	0 km N of Mogul, Nevada	M4.8	141 km	3 km
Oct 30, 1998	4 km N of Tahoe Vista, California	M4.8	117 km	1 km
Dec 28, 1995	9 km WNW of Topaz Lake, Nevada	M4.8	129 km	-1 km
Jun 26, 2005	8 km NNW of Tahoe Vista, California	M4.8	115 km	-2 km
May 12, 2006	7 km W of Cobb, California	M4.7	146 km	4 km
Dec 23, 1995	8 km WNW of Topaz Lake, Nevada	M4.7	131 km	-1 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	141 km	1 km
May 7, 2021	19km NW of Truckee, CA	M4.7	114 km	10 km
Jul 8, 2021	29km ENE of Dardanelle, CA	M4.6	140 km	2 km
Dec 12, 1996	4 km SSW of Topaz Lake, Nevada	M4.6	137 km	-2 km

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

Tornado History

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

Date	Rating	Distance	Path	Fatalities
Feb 7, 1978	EF2	27 km	1.9 mi	0
Mar 11, 2023	EF1	98 km	0.8 mi	0
Jan 10, 2023	EF1	73 km	0.4 mi	0
Dec 24, 2015	EF1	5 km	6.2 mi	0
Oct 22, 2012	EF1	42 km	4.0 mi	0
Oct 22, 2012	EF1	57 km	0.3 mi	0
Oct 22, 2012	EF1	61 km	2.0 mi	0
Jan 23, 2010	EF1	100 km	1.6 mi	0
Jan 8, 2005	EF1	95 km	0.1 mi	0
Jan 7, 1993	EF1	98 km	0.1 mi	0
Dec 17, 1992	EF1	76 km	5.0 mi	0
Apr 19, 1988	EF1	55 km	0.2 mi	0
Apr 19, 1988	EF1	3 km	1.0 mi	0
Mar 22, 1983	EF1	19 km	2.0 mi	0
Jun 28, 1970	EF1	95 km	2.3 mi	0
May 31, 1967	EF1	79 km	0.1 mi	0
Jan 14, 2023	EF0	39 km	0.3 mi	0
Nov 8, 2022	EF0	41 km	0.8 mi	0
Nov 18, 2020	EF0	13 km	4.4 mi	0
May 18, 2020	EF0	31 km	0.1 mi	0

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

Tsunami History

1 tsunami 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	136 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

2 volcanoes within 200 km. Closest: Clear Lake (145 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	145 km
Mono Lake Volcanic Field	Pyroclastic cone(s)	2,121 m (6,959 ft)	1790	199 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	99 km
2021	CALDOR	226,583	74 km
2014	KING	99,070	60 km
2018	COUNTY	92,450	88 km
2022	MOSQUITO	77,858	57 km
2015	BUTTE	72,894	65 km
2004	RUMSEY	39,335	99 km
1988	49R	36,673	65 km
1988	MILLER	35,750	87 km
2013	AMERICAN	27,938	71 km
1992	CLEVELAND	21,835	64 km
2008	AMERICAN RIVER COMPLEX (GOVERNMENT)	20,709	77 km
1992	GULCH	18,019	79 km
2004	POWER	17,266	77 km
2001	STAR	16,846	74 km
2017	CASCADE	16,155	80 km
2001	DARBY	14,734	90 km
2006	ZAM ASSIST	14,404	67 km
2018	WAVERLY	12,238	79 km
1996	SCOTT	8,828	14 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	47°F (8°C)	4.4 in	Wettest
February	51°F (10°C)	3.8 in
March	54°F (12°C)	3.9 in
April	59°F (15°C)	1.8 in
May	66°F (19°C)	0.5 in
June	73°F (23°C)	0.2 in
July	79°F (26°C)	0.1 in	Warmest, Driest
August	77°F (25°C)	0.1 in
September	73°F (23°C)	0.5 in
October	65°F (18°C)	1.5 in
November	53°F (12°C)	3.7 in
December	46°F (8°C)	3.4 in	Coldest

Folsom has a seasonal temperature swing of 33°F / from 46°F in December to 79°F in July. Total annual precipitation is 24.0 inches, with January being the wettest month (4.4") and July the driest (0.1").

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