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Weather & Climate in Glendora, CA

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

Glendora enjoys a temperate climate with an average annual temperature of 65°F (18°C). Winters average 56°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 14.5 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 932 feet.

Temperature

56°F Jan (13°C) 76°F Jul (25°C)
Annual Average65.1°F
21% above US avg
January Average56°F (13°C)
July Average76°F (25°C)
Sunny Days330 days/yr

Geography

Elevation932 ft (284 m)
Area19.6 sq mi (50.7 km²)
Population Density2,632/sq mi
Coordinates34.1450°N, 117.8478°W
TimezoneAmerica/Los_Angeles
CountyLos Angeles County County
Nearest AirportOntario International (ONT)
15 miles away

Precipitation & Snow

Annual Rainfall 14.5"
62% below US avg
Snowfall 0.0"
Wettest Month (Feb) 3.58"
Driest Month (Jul) 0.04"

Air Quality

AQI Median48.0
RatingGood

Natural Hazard Risk

Overall RiskVery High
Risk Score100.0 / 100
Social Vulnerability55.4 / 100
Community Resilience13.6 / 100

Hazard Breakdown

Tornado Relatively High
Hurricane No Rating
Earthquake Very High
Wildfire Very High
Flood Very High
Hail Relatively Moderate
Strong Wind Relatively Moderate
Heat Wave Relatively High
Winter Weather Relatively Moderate
Lightning Very High
Drought Relatively Low
Cold Wave Very Low
Landslide Relatively High
Coastal Flood Relatively High
Tsunami Relatively Low
Avalanche Relatively High
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

11,729 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.3.

Jun 28, 1992 The 1992 Landers, California Earthquake M7.3 130 km 0 km
Jan 17, 1994 Northridge, California, earthquake M6.7 64 km 18 km
Jun 28, 1992 The 1992 Big Bear, California Earthquake M6.3 94 km 4 km
Apr 23, 1992 The 1992 Joshua Tree, California Earthquake M6.1 143 km 12 km
Jan 17, 1994 1km ENE of Granada Hills, California M5.9 61 km 5 km
Jun 28, 1991 The 1991 Sierra Madre, California Earthquake M5.8 19 km 8 km
Jun 28, 1992 3km NE of Yucca Valley, California M5.8 133 km -1 km
Jun 28, 1992 2km SSW of Joshua Tree, California M5.7 140 km 6 km
Jun 29, 1992 3km ESE of Yucca Valley, California M5.7 133 km 10 km
Jul 11, 1992 12km NW of California City, California M5.7 120 km 10 km
Oct 16, 1999 7km ENE of Running Springs, CA M5.6 75 km 6 km
Jan 17, 1994 7km NNE of Simi Valley, California M5.6 81 km 9 km
Jun 28, 1992 11km SSE of Big Bear Lake, California M5.5 92 km 10 km
Feb 28, 1990 The 1990 Upland, California Earthquake M5.5 14 km 3 km
Jun 28, 1992 0km E of Yucca Valley, CA M5.5 131 km 8 km
Jul 5, 1992 21km SW of Ludlow, California M5.4 148 km 5 km
Jun 28, 1992 26km NNW of Yucca Valley, CA M5.4 125 km 4 km
Jul 1, 1992 24km N of Yucca Valley, California M5.3 129 km 5 km
Nov 27, 1992 10km NNW of Big Bear City, California M5.3 90 km 0 km
Jun 28, 1992 1km N of Big Bear Lake, California M5.3 87 km 7 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

119 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 55 injuries.

Date Rating Distance Path Fatalities
May 22, 2008 EF2 63 km 2.8 mi 0
Mar 1, 1983 EF2 52 km 3.5 mi 0
Nov 9, 1982 EF2 56 km 1.0 mi 0
Nov 9, 1982 EF2 52 km 10.0 mi 0
Nov 7, 1966 EF2 55 km 10.3 mi 0
Nov 7, 1966 EF2 50 km 0.1 mi 0
Nov 7, 1966 EF2 55 km 0.2 mi 0
Jun 25, 1954 EF2 80 km 0.1 mi 0
Mar 22, 2023 EF1 30 km 0.5 mi 0
Jan 19, 2010 EF1 54 km 4.6 mi 0
Feb 19, 2005 EF1 97 km 2.8 mi 0
Jan 9, 1998 EF1 50 km 1.5 mi 0
Dec 21, 1997 EF1 55 km 1.0 mi 0
Nov 11, 1997 EF1 52 km 0.2 mi 0
May 18, 1997 EF1 80 km 9.0 mi 0
May 18, 1997 EF1 78 km 3.5 mi 0
May 11, 1997 EF1 73 km 0.2 mi 0
Jan 14, 1993 EF1 31 km 1.0 mi 0
Dec 7, 1992 EF1 46 km 0.1 mi 0
Dec 7, 1992 EF1 36 km 0.1 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Tsunami History

3 tsunamis recorded within 500 km. Highest wave on record: 3.1 m (10 ft).

Year Location Cause Max Wave Deaths Distance
1930 S. CALIFORNIA Eruption + Earthquake 3.1 m 1 74 km
1994 WEST COAST, USA Earthquake 0.1 m 57 64 km
1855 S. CALIFORNIA Eruption + Earthquake — — 24 km
Source: NOAA/NCEI Historical Tsunami Database.

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: STATION (165,368 acres, 2009).

Year Name Acres Burned Distance
2009 STATION 165,368 33 km
2020 BOBCAT 115,728 22 km
2003 SIMI 107,756 89 km
2018 WOOLSEY 97,962 90 km
2003 OLD 90,180 53 km
1999 WILLOW 63,525 72 km
2003 GRAND PRIX 50,799 35 km
2016 SAND 41,561 54 km
2007 BUCKWEED 41,332 69 km
2006 ESPERANZA 40,566 95 km
2002 WILLIAMS 37,505 9 km
2007 RANCH 37,009 91 km
2016 BLUE CUT 36,856 37 km
2008 YELLOW 33,232 91 km
2020 APPLE 32,374 91 km
2013 POWERHOUSE 32,329 81 km
2020 LAKE 30,971 89 km
2015 LAKE 30,421 100 km
2008 FREEWAY COMPLEX 29,350 27 km
2007 SANTIAGO 27,605 50 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 56°F (13°C) 3.4 in
February 57°F (14°C) 3.6 in Wettest
March 59°F (15°C) 3.1 in
April 62°F (17°C) 1.0 in
May 66°F (19°C) 0.2 in
June 71°F (22°C) 0.1 in
July 76°F (25°C) 0.0 in Warmest, Driest
August 76°F (25°C) 0.1 in
September 74°F (23°C) 0.3 in
October 68°F (20°C) 0.5 in
November 60°F (16°C) 1.7 in
December 55°F (13°C) 2.2 in Coldest

Glendora has a seasonal temperature swing of 21°F / from 55°F in December to 76°F in July. Total annual precipitation is 16.2 inches, with February being the wettest month (3.6") and July the driest (0.0").

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