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Weather & Climate in Bostonia, CA

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

Bostonia enjoys a temperate climate with an average annual temperature of 65°F (18°C). Winters average 56°F in January while summers reach 75°F in July / relatively mild seasonal variation. 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 11.6 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 672 feet.

Temperature

56°F Jan (13°C) 75°F Jul (24°C)
Annual Average65.2°F
21% above US avg
January Average56°F (13°C)
July Average75°F (24°C)
Sunny Days330 days/yr

Geography

Elevation672 ft (205 m)
Area1.9 sq mi (5.0 km²)
Population Density8,573/sq mi
Coordinates32.8190°N, 116.9423°W
TimezoneAmerica/Los_Angeles
CountySan Diego County County
Nearest AirportSan Diego International (SAN)
16 miles away

Precipitation & Snow

Annual Rainfall 11.6"
69% below US avg
Snowfall 0.0"
Wettest Month (Jan) 2.56"
Driest Month (Jun) 0.08"

Air Quality

AQI Median48.0
RatingGood

Natural Hazard Risk

Overall RiskVery High
Risk Score99.7 / 100
Social Vulnerability24.8 / 100
Community Resilience8.3 / 100

Hazard Breakdown

Tornado Relatively Low
Hurricane Very Low
Earthquake Relatively High
Wildfire Very High
Flood Very High
Hail Relatively Moderate
Strong Wind Relatively Moderate
Heat Wave Relatively High
Winter Weather Relatively Low
Lightning Relatively Moderate
Drought Relatively Low
Cold Wave Very Low
Landslide Relatively High
Coastal Flood Relatively Moderate
Tsunami Relatively Low
Volcano Very Low
Avalanche Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

9,662 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.1.

Apr 23, 1992 The 1992 Joshua Tree, California Earthquake M6.1 140 km 12 km
Jun 15, 2010 8km ESE of Ocotillo, CA M5.7 97 km 9 km
Jun 28, 1992 11km SSE of Big Bear Lake, California M5.5 150 km 10 km
Jul 7, 2010 20km NNW of Borrego Springs, CA M5.4 80 km 12 km
Aug 26, 2012 4km NNW of Brawley, CA M5.4 133 km 8 km
Aug 26, 2012 5km NNW of Brawley, CA M5.3 132 km 8 km
Mar 23, 1994 35km E of Maneadero, B.C., MX M5.3 139 km 5 km
Apr 4, 2010 15km SSW of Progreso, B.C., MX M5.3 129 km 10 km
Sep 15, 1992 9km SE of Yucca Valley, California M5.3 149 km 7 km
Jun 5, 2021 11km W of Calipatria, CA M5.3 127 km 6 km
Apr 14, 2025 5 km S of Julian, CA M5.2 40 km 14 km
Jun 12, 2005 10km ESE of Anza, CA M5.2 87 km 13 km
Jun 10, 2016 20km NNW of Borrego Springs, CA M5.2 83 km 12 km
Oct 31, 2001 16km ESE of Anza, CA M5.0 86 km 14 km
Aug 21, 1993 12km S of Joshua Tree, California M5.0 146 km 8 km
Jun 28, 1992 7km SSW of Yucca Valley, California M5.0 145 km 5 km
Jun 30, 1992 14km ENE of Desert Hot Springs, CA M5.0 142 km 1 km
May 4, 1992 16km NNE of Thousand Palms, California M5.0 138 km 12 km
Jun 15, 2004 67km SE of San Clemente Is. (SE tip), CA M5.0 105 km 10 km
Apr 5, 2010 20km ESE of Ocotillo, CA M5.0 108 km 1 km
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.

Tornado History

31 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF1. Total: 4 injuries.

Date Rating Distance Path Fatalities
Feb 19, 2005 EF1 77 km 2.8 mi 0
Nov 10, 2000 EF1 16 km 0.4 mi 0
Jan 29, 1998 EF1 42 km 0.5 mi 0
Mar 27, 1991 EF1 43 km 0.2 mi 0
Mar 19, 1991 EF1 17 km 1.0 mi 0
Feb 20, 1980 EF1 25 km 0.1 mi 0
Dec 18, 1978 EF1 59 km 0.8 mi 0
Oct 8, 1961 EF1 55 km 0.1 mi 0
Apr 13, 1956 EF1 25 km 0.1 mi 0
Aug 16, 2018 EF0 86 km 0.2 mi 0
Oct 17, 2015 EF0 99 km 0.0 mi 0
Sep 22, 2007 EF0 39 km 0.1 mi 0
Mar 11, 2006 EF0 31 km 2.0 mi 0
Mar 10, 2006 EF0 42 km 0.2 mi 0
Feb 23, 2005 EF0 25 km 0.1 mi 0
Feb 19, 2005 EF0 70 km 2.2 mi 0
Feb 19, 2005 EF0 67 km 2.5 mi 0
Oct 17, 2004 EF0 59 km 0.2 mi 0
Jul 12, 1999 EF0 52 km 0.1 mi 0
Feb 8, 1998 EF0 39 km 3.0 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).

Tsunami History

1 tsunami recorded within 500 km. Highest wave on record: 1.2 m (4 ft).

Year Location Cause Max Wave Deaths Distance
1862 S. CALIFORNIA Eruption + Earthquake 1.2 m - 28 km
Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Salton Buttes (131 km).

Name Type Elevation Last Eruption Distance
Salton Buttes Lava dome(s) -40 m (-131 ft) 210 131 km
Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: CEDAR (268,362 acres, 2003).

Year Name Acres Burned Distance
2003 CEDAR 268,362 21 km
2007 WITCH 167,551 33 km
2007 HARRIS 90,443 25 km
2002 PINES 65,407 50 km
2003 PARADISE 55,995 43 km
2007 POOMACHA 47,496 54 km
2003 MINE/OTAY 37,232 24 km
2008 YELLOW 33,232 80 km
2022 FAIRVIEW 28,680 95 km
2020 INDIA 24,193 79 km
1993 CALIFORNIA 23,899 91 km
1994 PALM 21,040 99 km
1993 ORTEGA 20,912 99 km
2003 COYOTE 19,215 72 km
2007 AMMO FIRE 19,213 76 km
1993 GUEJITO 17,141 34 km
2006 HORSE 16,659 32 km
2020 VALLEY 16,517 25 km
1986 UNNAMED 16,390 84 km
1989 VAIL 15,632 67 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 56°F (13°C) 2.6 in Wettest
February 57°F (14°C) 2.4 in
March 58°F (14°C) 2.5 in
April 61°F (16°C) 1.1 in
May 64°F (18°C) 0.3 in
June 69°F (20°C) 0.1 in Driest
July 75°F (24°C) 0.1 in
August 75°F (24°C) 0.2 in Warmest
September 73°F (23°C) 0.3 in
October 68°F (20°C) 0.4 in
November 61°F (16°C) 1.5 in
December 56°F (13°C) 1.8 in Coldest

Bostonia has a seasonal temperature swing of 19°F / from 56°F in December to 75°F in August. Total annual precipitation is 13.1 inches, with January being the wettest month (2.6") and June the driest (0.1").

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