Weather & Climate in Day Valley, CA

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

Day Valley enjoys a temperate climate with an average annual temperature of 60°F (15°C). Winters average 49°F in January while summers reach 70°F in July. The area gets 323 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 22.2 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 963 feet.

Temperature

49°F Jan (9°C) 70°F Jul (21°C)

Annual Average	59.6°F
	10% above US avg
January Average	49°F (9°C)
July Average	70°F (21°C)
Sunny Days	323 days/yr

Geography

Elevation	963 ft (294 m)
Area	18.5 sq mi (47.9 km²)
Population Density	190/sq mi
Coordinates	37.0254°N, 121.8559°W
Timezone	America/Los_Angeles
County	Santa Clara County County
Nearest Airport	Norman Y Mineta San Jose International (SJC) 24 miles away

Precipitation & Snow

Annual Rainfall 22.2"

42% below US avg

Snowfall 0.0"

Wettest Month (Jan) 6.57"

Driest Month (Jul) 0.12"

Air Quality

AQI Median	48.0
Rating	Good

Natural Hazard Risk

Overall Risk	Very High
Risk Score	99.8 / 100
Social Vulnerability	17.2 / 100
Community Resilience	72.6 / 100

Hazard Breakdown

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

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

Earthquake History

4,299 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	138 km	11 km
Apr 18, 1990	5 km NNW of Aromas, California	M5.4	21 km	5 km
Oct 21, 2012	24 km NE of San Lucas, California	M5.3	120 km	9 km
Sep 17, 1991	22 km NW of San Simeon, California	M5.2	143 km	9 km
Aug 12, 1998	10 km SW of Ridgemark, California	M5.1	46 km	9 km
Apr 18, 1990	4 km E of Interlaken, California	M5.1	17 km	7 km
Jan 16, 1993	9 km E of Gilroy, California	M4.9	35 km	7 km
Apr 19, 1996	2 km E of Aromas, California	M4.9	27 km	5 km
Apr 18, 1990	4 km NNW of Aromas, California	M4.9	21 km	6 km
Apr 23, 1995	22 km NNE of Soledad, California	M4.9	75 km	7 km
May 14, 2002	5 km SSW of Gilroy, California	M4.9	24 km	7 km
Feb 4, 1991	33 km SE of Big Sur, California	M4.7	113 km	9 km
Apr 18, 1990	4 km N of Aromas, California	M4.7	22 km	4 km
May 21, 1996	8 km ESE of East Foothills, California	M4.7	39 km	8 km
Aug 11, 1993	14 km ESE of Alum Rock, California	M4.7	36 km	9 km
Aug 27, 2011	21 km NE of Soledad, California	M4.6	78 km	8 km
Aug 18, 1999	0 km S of Bolinas, California	M4.6	122 km	8 km
Mar 24, 1991	1 km NNE of Interlaken, California	M4.6	13 km	15 km
Sep 19, 2023	15 km SW of Westley, CA	M4.5	68 km	4 km
Jan 12, 2011	9 km SSE of San Juan Bautista, California	M4.5	43 km	8 km

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

Tornado History

39 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 11 injuries.

Date	Rating	Distance	Path	Fatalities
May 5, 1998	EF2	41 km	0.6 mi	0
Mar 11, 1985	EF2	45 km	0.5 mi	0
Jan 11, 1951	EF2	45 km	5.7 mi	0
Dec 14, 2024	EF1	16 km	0.3 mi	0
Jan 23, 2010	EF1	99 km	1.6 mi	0
Mar 20, 2005	EF1	86 km	3.0 mi	0
Dec 20, 2001	EF1	9 km	0.5 mi	0
May 5, 1998	EF1	46 km	0.3 mi	0
Dec 6, 1992	EF1	47 km	1.0 mi	0
Dec 6, 1992	EF1	53 km	7.0 mi	0
Jan 14, 1980	EF1	51 km	0.3 mi	0
Mar 4, 1978	EF1	99 km	1.0 mi	0
Apr 22, 1967	EF1	99 km	1.0 mi	0
Apr 1, 1965	EF1	7 km	0.1 mi	0
Apr 1, 1958	EF1	79 km	0.2 mi	0
Jan 6, 2019	EF0	16 km	0.5 mi	0
Jan 6, 2019	EF0	18 km	0.1 mi	0
Apr 22, 2016	EF0	94 km	0.2 mi	0
Jan 6, 2016	EF0	43 km	0.6 mi	0
Dec 22, 2012	EF0	16 km	1.1 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	78 km
1989	N. CALIFORNIA	Earthquake	1.0 m	62	3 km
1856	N. CALIFORNIA	Eruption + Earthquake	0.6 m	—	66 km
1906	N. CALIFORNIA	Eruption + Earthquake	0.1 m	—	94 km
1865	N. CALIFORNIA	Eruption + Earthquake	—	—	20 km

Source: NOAA/NCEI Historical Tsunami Database.

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	61 km
2008	BASIN COMPLEX	164,537	94 km
2016	SOBERANES	131,921	79 km
2020	CZU AUG LIGHTNING	85,894	35 km
2020	RIVER	51,582	65 km
2007	LICK	47,424	44 km
2006	CANYON	36,851	59 km
1999	KIRK COMPLEX (FIVE)	36,162	86 km
2003	ANNIE	17,383	59 km
1996	MERCY	16,993	94 km
2024	CORRAL	16,138	76 km
1984	BONANZA	12,105	87 km
2009	CORRAL	12,006	71 km
1985	LEXINGTON	11,550	15 km
2009	LOCKHEED	8,287	32 km
2003	BIRD	7,727	74 km
2020	CARMEL	7,299	70 km
1984	SITE 300 3	6,911	77 km
2009	GLORIA	6,686	80 km
2005	TESLA	6,638	75 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	49°F (9°C)	6.6 in	Wettest
February	50°F (10°C)	5.4 in
March	51°F (11°C)	5.0 in
April	54°F (12°C)	2.2 in
May	58°F (15°C)	0.5 in
June	62°F (17°C)	0.2 in
July	70°F (21°C)	0.1 in	Warmest, Driest
August	67°F (19°C)	0.1 in
September	65°F (18°C)	0.4 in
October	61°F (16°C)	1.6 in
November	54°F (12°C)	4.5 in
December	49°F (9°C)	4.9 in	Coldest

Day Valley has a seasonal temperature swing of 22°F / from 49°F in December to 70°F in July. Total annual precipitation is 31.5 inches, with January being the wettest month (6.6") and July the driest (0.1").

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