Weather & Climate in Three Rocks, CA

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

Three Rocks enjoys a temperate climate with an average annual temperature of 62°F (17°C). Winters average 46°F in January while summers reach 80°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 11.3 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 409 feet.

Temperature

46°F Jan (8°C) 80°F Jul (27°C)

Annual Average	62.4°F
	16% above US avg
January Average	46°F (8°C)
July Average	80°F (27°C)
Sunny Days	330 days/yr

Geography

Elevation	409 ft (125 m)
Area	0.8 sq mi (1.9 km²)
Population Density	240/sq mi
Coordinates	36.5051°N, 120.3935°W
Timezone	America/Los_Angeles
County	San Benito County County
Nearest Airport	Fresno Yosemite International (FAT) 42 miles away

Precipitation & Snow

Annual Rainfall 11.3"

70% below US avg

Snowfall 0.0"

Wettest Month (Feb) 1.38"

Driest Month (Jun) 0.04"

Air Quality

AQI Median	48.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Moderate
Risk Score	85.2 / 100
Social Vulnerability	10.6 / 100
Community Resilience	56.0 / 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	Relatively High
Cold Wave	No Rating
Landslide	Relatively Moderate
Avalanche	Very Low

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

Earthquake History

4,925 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.0.

Sep 28, 2004	2004 Parkfield, California Earthquake	M6.0	76 km	8 km
Apr 18, 1990	5 km NNW of Aromas, California	M5.4	122 km	5 km
Oct 21, 2012	24 km NE of San Lucas, California	M5.3	47 km	9 km
Sep 17, 1991	22 km NW of San Simeon, California	M5.2	115 km	9 km
Apr 18, 1990	4 km E of Interlaken, California	M5.1	126 km	7 km
Aug 12, 1998	10 km SW of Ridgemark, California	M5.1	99 km	9 km
Sep 29, 2004	8 km NW of Parkfield, California	M5.0	62 km	11 km
Jan 16, 1993	9 km E of Gilroy, California	M4.9	111 km	7 km
May 14, 2002	5 km SSW of Gilroy, California	M4.9	119 km	7 km
Apr 18, 1990	4 km NNW of Aromas, California	M4.9	122 km	6 km
Dec 20, 1994	3 km NW of Parkfield, California	M4.9	66 km	8 km
Apr 23, 1995	22 km NNE of Soledad, California	M4.9	73 km	7 km
Apr 19, 1996	2 km E of Aromas, California	M4.9	117 km	5 km
Sep 30, 2004	13 km NW of Parkfield, California	M4.9	59 km	10 km
Feb 24, 2016	6km SSW of Wasco, CA	M4.9	141 km	22 km
Nov 14, 1993	8 km NW of Parkfield, California	M4.8	62 km	11 km
Sep 28, 2004	12 km SE of Parkfield, California	M4.7	78 km	6 km
Apr 18, 1990	4 km N of Aromas, California	M4.7	121 km	4 km
Feb 4, 1991	33 km SE of Big Sur, California	M4.7	118 km	9 km
Aug 11, 1993	14 km ESE of Alum Rock, California	M4.7	145 km	9 km

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

Tornado History

72 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 5 injuries.

Date	Rating	Distance	Path	Fatalities
Mar 11, 1985	EF2	98 km	0.5 mi	0
Apr 5, 1980	EF2	64 km	15.0 mi	0
Mar 22, 1962	EF2	62 km	0.5 mi	0
Jan 17, 2019	EF1	83 km	0.3 mi	0
Dec 16, 2002	EF1	92 km	1.3 mi	0
May 20, 2002	EF1	53 km	2.7 mi	0
Feb 14, 1998	EF1	41 km	3.0 mi	0
Nov 22, 1996	EF1	46 km	0.8 mi	0
Nov 22, 1996	EF1	92 km	0.2 mi	0
Jan 14, 1995	EF1	69 km	1.0 mi	0
Feb 28, 1991	EF1	86 km	0.2 mi	0
Mar 8, 1986	EF1	67 km	4.0 mi	0
Mar 28, 1982	EF1	70 km	5.0 mi	0
Feb 19, 1980	EF1	67 km	1.7 mi	0
Mar 14, 1979	EF1	66 km	2.0 mi	0
Apr 22, 1967	EF1	33 km	0.1 mi	0
Apr 22, 1967	EF1	73 km	1.0 mi	0
Apr 21, 1967	EF1	59 km	0.1 mi	0
May 19, 1957	EF1	55 km	0.1 mi	0
Mar 1, 2024	EF0	65 km	0.4 mi	0

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

Tsunami History

2 tsunamis recorded within 500 km. Highest wave on record: 1.0 m (3 ft).

Year	Location	Cause	Max Wave	Deaths	Distance
1989	N. CALIFORNIA	Earthquake	1.0 m	62	145 km
1901	MONTEREY BAY, N. CALIFORNIA	Eruption + Earthquake	—	—	57 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

3 volcanoes within 200 km. Closest: Mammoth Mountain (174 km).

Name	Type	Elevation	Last Eruption	Distance
Mammoth Mountain	Lava dome(s)	3,369 m (11,053 ft)	1260	174 km
Golden Trout Creek	Volcanic field	2,886 m (9,469 ft)	-5550	186 km
Mono-Inyo Craters	Lava dome(s)	2,796 m (9,173 ft)	1380	188 km

Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: BASIN COMPLEX (INDIANS) (59,095 acres, 2008).

Year	Name	Acres Burned	Distance
2008	BASIN COMPLEX (INDIANS)	59,095	97 km
2017	GARZA	48,404	62 km
1985	CHERRY	41,654	85 km
2005	UNNAMED	39,070	98 km
2020	MINERAL	29,901	40 km
1984	UNNAMED	23,122	99 km
1993	ORCHARD	22,309	90 km
1996	SKYLINE	21,694	65 km
1985	LOSGATOSIV	20,357	22 km
1996	UNNAMED	19,243	98 km
2024	BOONE	17,701	41 km
1996	MERCY	16,993	55 km
1996	PANOCHE II	14,760	22 km
1984	BONANZA	12,105	56 km
2006	RICO	11,807	57 km
2017	ELM 2	10,765	48 km
1984	UNNAMED	10,420	95 km
1992	UNNAMED	10,235	98 km
1996	HWY 41	9,537	85 km
1997	UNNAMED	9,396	85 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	46°F (8°C)	1.3 in	Coldest
February	51°F (11°C)	1.4 in	Wettest
March	55°F (13°C)	1.1 in
April	60°F (16°C)	0.6 in
May	67°F (20°C)	0.2 in
June	74°F (23°C)	0.0 in
July	80°F (27°C)	0.0 in	Warmest, Driest
August	78°F (25°C)	0.0 in
September	74°F (23°C)	0.3 in
October	66°F (19°C)	0.4 in
November	54°F (12°C)	0.9 in
December	46°F (8°C)	1.0 in

Three Rocks has a seasonal temperature swing of 34°F / from 46°F in January to 80°F in July. Total annual precipitation is 7.2 inches, with February being the wettest month (1.4") and July the driest (0.0").

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