Weather & Climate in Franklin CDP (Sacramento County), CA

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

Franklin CDP (Sacramento County) enjoys a temperate climate with an average annual temperature of 62°F (17°C). Winters average 48°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 18.4 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 17 feet.

Temperature

48°F Jan (9°C) 76°F Jul (24°C)

Annual Average	62.2°F
	15% above US avg
January Average	48°F (9°C)
July Average	76°F (24°C)
Sunny Days	330 days/yr

Geography

Elevation	17 ft (5 m)
Area	2.1 sq mi (5.5 km²)
Population Density	116/sq mi
Coordinates	38.3675°N, 121.4616°W
Timezone	America/Los_Angeles
County	Sacramento County County
Nearest Airport	Sacramento International (SMF) 24 miles away

Precipitation & Snow

Annual Rainfall 18.4"

52% below US avg

Snowfall 0.0"

Wettest Month (Jan) 3.86"

Driest Month (Jul) 0.08"

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

4,145 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	76 km	11 km
Jan 16, 1993	9 km E of Gilroy, California	M4.9	150 km	7 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	83 km	9 km
Sep 4, 1995	13 km SW of Middletown, California	M4.8	117 km	7 km
May 12, 2006	7 km W of Cobb, California	M4.7	128 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	114 km	8 km
Aug 11, 1993	14 km ESE of Alum Rock, California	M4.7	119 km	9 km
Jan 2, 2025	4 km NW of Cobb, CA	M4.7	124 km	1 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	119 km	8 km
Jan 11, 2000	6 km N of Geyserville, California	M4.6	134 km	6 km
Feb 18, 2004	4 km WNW of Cobb, California	M4.6	125 km	3 km
Sep 19, 2023	15 km SW of Westley, CA	M4.5	104 km	4 km
Jan 12, 2014	8 km W of Cobb, California	M4.5	128 km	2 km
Aug 3, 2006	5 km W of Glen Ellen, California	M4.5	98 km	9 km
Jun 8, 2024	7 km NW of The Geysers, CA	M4.5	128 km	4 km
Sep 19, 1992	7 km NW of Cobb, California	M4.5	128 km	3 km
Apr 24, 2007	7 km WSW of Cobb, California	M4.5	125 km	2 km
Jun 3, 2023	2km NW of The Geysers, CA	M4.5	124 km	4 km
Mar 14, 2013	5 km W of Cobb, California	M4.4	125 km	1 km
Apr 12, 2023	7km WNW of Cobb, CA	M4.4	128 km	2 km

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

Tornado History

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

Date	Rating	Distance	Path	Fatalities
Feb 7, 1978	EF2	37 km	1.9 mi	0
Apr 27, 1953	EF2	89 km	0.1 mi	0
Mar 11, 2023	EF1	95 km	0.8 mi	0
Jan 10, 2023	EF1	69 km	0.4 mi	0
Dec 24, 2015	EF1	48 km	6.2 mi	0
Oct 22, 2012	EF1	79 km	2.0 mi	0
Oct 22, 2012	EF1	82 km	4.0 mi	0
Oct 22, 2012	EF1	79 km	0.3 mi	0
Jan 23, 2010	EF1	57 km	1.6 mi	0
Apr 14, 2006	EF1	89 km	0.5 mi	0
Dec 12, 1996	EF1	85 km	0.6 mi	0
Apr 19, 1988	EF1	35 km	0.2 mi	0
Apr 19, 1988	EF1	43 km	1.0 mi	0
Mar 22, 1983	EF1	40 km	2.0 mi	0
Mar 4, 1978	EF1	99 km	2.5 mi	0
Mar 1, 1978	EF1	91 km	1.5 mi	0
May 31, 1967	EF1	46 km	0.1 mi	0
Jan 14, 2023	EF0	29 km	0.3 mi	0
Nov 8, 2022	EF0	13 km	0.8 mi	0
Nov 18, 2020	EF0	50 km	4.4 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	93 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	121 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	117 km
1865	N. CALIFORNIA	Eruption + Earthquake	—	—	135 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (132 km).

Name	Type	Elevation	Last Eruption	Distance
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	132 km

Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: SCU LIGHTNING COMPLEX (405,787 acres, 2020).

Year	Name	Acres Burned	Distance
2020	SCU LIGHTNING COMPLEX	405,787	97 km
2020	HENNESSEY	314,241	77 km
2018	COUNTY	92,450	70 km
2015	BUTTE	72,894	77 km
2020	GLASS	68,020	97 km
2017	NUNS	56,883	91 km
2017	ATLAS	51,664	68 km
2004	RUMSEY	39,335	83 km
1999	SIXTEEN	37,162	90 km
1988	49R	36,673	100 km
1988	MILLER	35,750	56 km
1992	GULCH	18,019	88 km
2024	CORRAL	16,138	81 km
2006	ZAM ASSIST	14,404	58 km
2018	WAVERLY	12,238	68 km
2009	CORRAL	12,006	86 km
1996	SCOTT	8,828	42 km
2015	WRAGG	8,455	54 km
2006	RALSTON	7,975	100 km
2003	BIRD	7,727	92 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	48°F (9°C)	3.9 in	Wettest
February	51°F (11°C)	3.4 in
March	55°F (13°C)	2.8 in
April	60°F (15°C)	1.1 in
May	66°F (19°C)	0.5 in
June	72°F (22°C)	0.2 in
July	76°F (24°C)	0.1 in	Warmest, Driest
August	74°F (23°C)	0.1 in
September	71°F (22°C)	0.3 in
October	64°F (18°C)	1.0 in
November	53°F (12°C)	2.5 in
December	46°F (8°C)	2.6 in	Coldest

Franklin CDP (Sacramento County) has a seasonal temperature swing of 30°F / from 46°F in December to 76°F in July. Total annual precipitation is 18.3 inches, with January being the wettest month (3.9") and July the driest (0.1").

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