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Weather & Climate in Upland, CA

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

Upland enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 48°F in January while summers reach 79°F in July. The area gets 325 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 51.0 inches (wetter than the 38-inch national average). The area receives 14.6 inches of snow annually. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 1,450 feet.

Temperature

48°F Jan (9°C) 79°F Jul (26°C)
Annual Average61.0°F
13% above US avg
January Average48°F (9°C)
July Average79°F (26°C)
Sunny Days325 days/yr

Geography

Elevation1,450 ft (442 m)
Area15.7 sq mi (40.5 km²)
Population Density5,067/sq mi
Coordinates34.1161°N, 117.6599°W
TimezoneAmerica/Los_Angeles
CountyOrange County County
Nearest AirportOntario International (ONT)
5 miles away

Precipitation & Snow

Annual Rainfall 51.0"
34% above US avg
Snowfall 14.6"
Wettest Month (Feb) 3.11"
Driest Month (Jun) 0.04"

Air Quality

AQI Median48.0
RatingGood

Natural Hazard Risk

Overall RiskVery High
Risk Score99.8 / 100
Social Vulnerability24.9 / 100
Community Resilience16.3 / 100

Hazard Breakdown

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

Earthquake History

13,465 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.3.

Jun 28, 1992 The 1992 Landers, California Earthquake M7.3 113 km 0 km
Oct 16, 1999 The 1999 Hector Mine, California Earthquake M7.1 139 km 14 km
Jan 17, 1994 Northridge, California, earthquake M6.7 81 km 18 km
Jun 28, 1992 The 1992 Big Bear, California Earthquake M6.3 77 km 4 km
Apr 23, 1992 The 1992 Joshua Tree, California Earthquake M6.1 125 km 12 km
Jan 17, 1994 1km ENE of Granada Hills, California M5.9 79 km 5 km
Jun 28, 1991 The 1991 Sierra Madre, California Earthquake M5.8 35 km 8 km
Oct 16, 1999 13km WSW of Ludlow, CA M5.8 140 km 14 km
Jun 28, 1992 3km NE of Yucca Valley, California M5.8 115 km -1 km
Jun 28, 1992 2km SSW of Joshua Tree, California M5.7 123 km 6 km
Jun 29, 1992 3km ESE of Yucca Valley, California M5.7 116 km 10 km
Jul 11, 1992 12km NW of California City, California M5.7 127 km 10 km
Oct 16, 1999 7km ENE of Running Springs, CA M5.6 59 km 6 km
Jan 17, 1994 7km NNE of Simi Valley, California M5.6 98 km 9 km
Jun 28, 1992 11km SSE of Big Bear Lake, California M5.5 75 km 10 km
Feb 28, 1990 The 1990 Upland, California Earthquake M5.5 5 km 3 km
Jun 28, 1992 0km E of Yucca Valley, CA M5.5 114 km 8 km
Jul 7, 2010 20km NNW of Borrego Springs, CA M5.4 134 km 12 km
Jul 5, 1992 21km SW of Ludlow, California M5.4 133 km 5 km
Jun 28, 1992 26km NNW of Yucca Valley, CA M5.4 109 km 4 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

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

Date Rating Distance Path Fatalities
May 22, 2008 EF2 46 km 2.8 mi 0
Mar 1, 1983 EF2 67 km 3.5 mi 0
Nov 9, 1982 EF2 73 km 1.0 mi 0
Nov 9, 1982 EF2 62 km 10.0 mi 0
Nov 7, 1966 EF2 57 km 0.2 mi 0
Nov 7, 1966 EF2 64 km 0.1 mi 0
Nov 7, 1966 EF2 69 km 10.3 mi 0
Jun 25, 1954 EF2 71 km 0.1 mi 0
Mar 22, 2023 EF1 45 km 0.5 mi 0
Jan 19, 2010 EF1 62 km 4.6 mi 0
Feb 19, 2005 EF1 84 km 2.8 mi 0
Jan 9, 1998 EF1 60 km 1.5 mi 0
Dec 21, 1997 EF1 59 km 1.0 mi 0
Nov 11, 1997 EF1 51 km 0.2 mi 0
May 18, 1997 EF1 70 km 9.0 mi 0
May 18, 1997 EF1 69 km 3.5 mi 0
May 11, 1997 EF1 62 km 0.2 mi 0
Dec 22, 1996 EF1 84 km 0.1 mi 0
Jan 14, 1993 EF1 38 km 1.0 mi 0
Dec 7, 1992 EF1 51 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 91 km
1994 WEST COAST, USA Earthquake 0.1 m 57 81 km
1855 S. CALIFORNIA Eruption + Earthquake — — 41 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 50 km
2020 BOBCAT 115,728 34 km
2003 OLD 90,180 38 km
2006 MILLARD 86,585 96 km
1999 WILLOW 63,525 57 km
2003 GRAND PRIX 50,799 19 km
2016 SAND 41,561 70 km
2007 BUCKWEED 41,332 85 km
2006 ESPERANZA 40,566 77 km
2002 WILLIAMS 37,505 14 km
2016 BLUE CUT 36,856 27 km
2008 YELLOW 33,232 83 km
2020 APPLE 32,374 74 km
2013 POWERHOUSE 32,329 96 km
2015 LAKE 30,421 83 km
2008 FREEWAY COMPLEX 29,350 24 km
2022 FAIRVIEW 28,680 88 km
2007 SANTIAGO 27,605 44 km
1998 EDNA 27,561 66 km
2020 INDIA 24,193 82 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 48°F (9°C) 3.0 in Coldest
February 56°F (13°C) 3.1 in Wettest
March 57°F (14°C) 2.7 in
April 61°F (16°C) 1.0 in
May 65°F (19°C) 0.3 in
June 71°F (22°C) 0.0 in Driest
July 79°F (26°C) 0.0 in Warmest
August 77°F (25°C) 0.2 in
September 74°F (23°C) 0.4 in
October 67°F (20°C) 0.4 in
November 59°F (15°C) 1.6 in
December 54°F (12°C) 2.0 in

Upland has a seasonal temperature swing of 30°F / from 48°F in January to 79°F in July. Total annual precipitation is 14.7 inches, with February being the wettest month (3.1") and June the driest (0.0").

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