Weather & Climate in Del Rio, CA

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

Del Rio enjoys a temperate climate with an average annual temperature of 63°F (17°C). Winters average 48°F in January while summers reach 78°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 13.5 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 71 feet.

Temperature

48°F Jan (9°C) 78°F Jul (26°C)

Annual Average	63.0°F
	17% above US avg
January Average	48°F (9°C)
July Average	78°F (26°C)
Sunny Days	330 days/yr

Geography

Elevation	71 ft (22 m)
Area	2.1 sq mi (5.4 km²)
Population Density	779/sq mi
Coordinates	37.7459°N, 121.0093°W
Timezone	America/Los_Angeles
County	Stanislaus County County
Nearest Airport	Merced Yosemite Regional (MCE) 42 miles away

Precipitation & Snow

Annual Rainfall 13.5"

65% below US avg

Wettest Month (Jan) 2.32"

Driest Month (Jul) 0.04"

Air Quality

AQI Median	48.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively High
Risk Score	96.9 / 100
Social Vulnerability	32.0 / 100
Community Resilience	33.9 / 100

Hazard Breakdown

Tornado	Relatively Low
Earthquake	Relatively High
Wildfire	Relatively Moderate
Flood	Relatively High
Hail	Relatively Low
Strong Wind	Relatively Low
Heat Wave	Relatively Moderate
Winter Weather	Relatively Low
Lightning	Relatively High
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

4,283 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	126 km	11 km
Apr 18, 1990	5 km NNW of Aromas, California	M5.4	107 km	5 km
Apr 18, 1990	4 km E of Interlaken, California	M5.1	106 km	7 km
Aug 12, 1998	10 km SW of Ridgemark, California	M5.1	117 km	9 km
Jan 16, 1993	9 km E of Gilroy, California	M4.9	90 km	7 km
Apr 18, 1990	4 km NNW of Aromas, California	M4.9	107 km	6 km
Apr 19, 1996	2 km E of Aromas, California	M4.9	110 km	5 km
May 14, 2002	5 km SSW of Gilroy, California	M4.9	101 km	7 km
Apr 23, 1995	22 km NNE of Soledad, California	M4.9	128 km	7 km
Sep 3, 2000	5 km WSW of Yountville, California	M4.9	142 km	9 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	76 km	8 km
Apr 18, 1990	4 km N of Aromas, California	M4.7	107 km	4 km
Aug 11, 1993	14 km ESE of Alum Rock, California	M4.7	76 km	9 km
Aug 27, 2011	21 km NE of Soledad, California	M4.6	130 km	8 km
Mar 24, 1991	1 km NNE of Interlaken, California	M4.6	108 km	15 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	148 km	8 km
Sep 19, 2023	15 km SW of Westley, CA	M4.5	43 km	4 km
Jan 12, 2011	9 km SSE of San Juan Bautista, California	M4.5	117 km	8 km
Jan 20, 2015	27 km ENE of Greenfield, California	M4.4	146 km	9 km
Apr 4, 2023	1km NNW of Tres Pinos, CA	M4.4	109 km	10 km

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

Tornado History

75 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 3 injuries.

Date	Rating	Distance	Path	Fatalities
May 5, 1998	EF2	99 km	0.6 mi	0
Apr 27, 1953	EF2	11 km	0.1 mi	0
Mar 11, 2023	EF1	47 km	0.8 mi	0
Jan 10, 2023	EF1	44 km	0.4 mi	0
Nov 15, 2015	EF1	30 km	3.0 mi	0
Jan 23, 2010	EF1	69 km	1.6 mi	0
Apr 14, 2006	EF1	11 km	0.5 mi	0
Dec 16, 2002	EF1	63 km	1.3 mi	0
Dec 12, 1996	EF1	14 km	0.6 mi	0
Nov 22, 1996	EF1	68 km	0.2 mi	0
Jan 14, 1995	EF1	95 km	1.0 mi	0
Apr 19, 1988	EF1	49 km	0.2 mi	0
Jan 14, 1980	EF1	82 km	0.3 mi	0
Mar 4, 1978	EF1	20 km	2.5 mi	0
Mar 4, 1978	EF1	39 km	1.0 mi	0
Mar 1, 1978	EF1	11 km	1.5 mi	0
May 31, 1967	EF1	36 km	0.1 mi	0
Apr 22, 1967	EF1	75 km	1.0 mi	0
Apr 1, 1958	EF1	37 km	2.0 mi	0
Jan 14, 2023	EF0	65 km	0.3 mi	0

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

Tsunami History

5 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	96 km
1989	N. CALIFORNIA	Earthquake	1.0 m	62	110 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	117 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	131 km
1865	N. CALIFORNIA	Eruption + Earthquake	—	—	99 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

3 volcanoes within 200 km. Closest: Mono-Inyo Craters (174 km).

Name	Type	Elevation	Last Eruption	Distance
Mono-Inyo Craters	Lava dome(s)	2,796 m (9,173 ft)	1380	174 km
Mammoth Mountain	Lava dome(s)	3,369 m (11,053 ft)	1260	175 km
Mono Lake Volcanic Field	Pyroclastic cone(s)	2,121 m (6,959 ft)	1790	176 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	52 km
2013	RIM	257,084	93 km
2017	DETWILER	83,297	81 km
2015	BUTTE	72,894	68 km
1987	PAPER	49,296	79 km
1987	LARSON	49,250	94 km
2007	LICK	47,424	69 km
1987	HAMM	39,333	84 km
2006	CANYON	36,851	52 km
2008	TELEGRAPH	33,479	89 km
1992	GULCH	18,019	67 km
1996	ROGGE	17,559	81 km
2003	ANNIE	17,383	61 km
1996	MERCY	16,993	100 km
2024	CORRAL	16,138	41 km
2001	DARBY	14,734	79 km
2018	WAVERLY	12,238	32 km
2009	CORRAL	12,006	45 km
2001	CREEK	9,793	68 km
1992	MOCCASIN	9,565	63 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	48°F (9°C)	2.3 in	Wettest
February	51°F (10°C)	2.0 in
March	55°F (13°C)	2.1 in
April	60°F (15°C)	0.9 in
May	66°F (19°C)	0.2 in
June	72°F (22°C)	0.1 in
July	78°F (26°C)	0.0 in	Warmest, Driest
August	75°F (24°C)	0.1 in
September	71°F (22°C)	0.3 in
October	64°F (18°C)	0.8 in
November	53°F (12°C)	2.0 in
December	45°F (7°C)	1.8 in	Coldest

Del Rio has a seasonal temperature swing of 33°F / from 45°F in December to 78°F in July. Total annual precipitation is 12.5 inches, with January being the wettest month (2.3") and July the driest (0.0").

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