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Weather & Climate in Rosemont, CA

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

Rosemont enjoys a temperate climate with an average annual temperature of 63°F (17°C). Winters average 49°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 19.2 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 59 feet.

Temperature

49°F Jan (9°C) 78°F Jul (26°C)
Annual Average63.4°F
17% above US avg
January Average49°F (9°C)
July Average78°F (26°C)
Sunny Days330 days/yr

Geography

Elevation59 ft (18 m)
Area4.4 sq mi (11.4 km²)
Population Density5,341/sq mi
Coordinates38.5477°N, 121.3554°W
TimezoneAmerica/Los_Angeles
CountySacramento County County
Nearest AirportSacramento International (SMF)
16 miles away

Precipitation & Snow

Annual Rainfall 19.2"
49% below US avg
Snowfall 0.0"
Wettest Month (Jan) 3.86"
Driest Month (Jul) 0.08"

Air Quality

AQI Median48.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively High
Risk Score98.1 / 100
Social Vulnerability37.4 / 100
Community Resilience57.0 / 100

Hazard Breakdown

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

Earthquake History

4,764 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 91 km 11 km
Sep 12, 1994 8 km ESE of Mesa Vista, California M5.1 146 km -1 km
Sep 3, 2000 5 km WSW of Yountville, California M4.9 94 km 9 km
Dec 28, 1995 9 km WNW of Topaz Lake, Nevada M4.8 149 km -1 km
Sep 4, 1995 13 km SW of Middletown, California M4.8 122 km 7 km
Oct 30, 1998 4 km N of Tahoe Vista, California M4.8 140 km 1 km
Jun 26, 2005 8 km NNW of Tahoe Vista, California M4.8 138 km -2 km
May 12, 2006 7 km W of Cobb, California M4.7 130 km 4 km
May 21, 1996 8 km ESE of East Foothills, California M4.7 136 km 8 km
Aug 11, 1993 14 km ESE of Alum Rock, California M4.7 140 km 9 km
Jan 2, 2025 4 km NW of Cobb, CA M4.7 126 km 1 km
May 7, 2021 19km NW of Truckee, CA M4.7 136 km 10 km
Aug 18, 1999 0 km S of Bolinas, California M4.6 136 km 8 km
Jan 11, 2000 6 km N of Geyserville, California M4.6 138 km 6 km
Feb 18, 2004 4 km WNW of Cobb, California M4.6 127 km 3 km
Sep 19, 2023 15 km SW of Westley, CA M4.5 124 km 4 km
Jan 12, 2014 8 km W of Cobb, California M4.5 130 km 2 km
Aug 3, 2006 5 km W of Glen Ellen, California M4.5 109 km 9 km
Jun 8, 2024 7 km NW of The Geysers, CA M4.5 131 km 4 km
Sep 19, 1992 7 km NW of Cobb, California M4.5 129 km 3 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

73 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 1 injury.

Date Rating Distance Path Fatalities
Feb 7, 1978 EF2 19 km 1.9 mi 0
Mar 11, 2023 EF1 100 km 0.8 mi 0
Jan 10, 2023 EF1 73 km 0.4 mi 0
Dec 24, 2015 EF1 27 km 6.2 mi 0
Oct 22, 2012 EF1 60 km 4.0 mi 0
Oct 22, 2012 EF1 62 km 2.0 mi 0
Oct 22, 2012 EF1 61 km 0.3 mi 0
Jan 23, 2010 EF1 79 km 1.6 mi 0
Dec 12, 1996 EF1 97 km 0.6 mi 0
Dec 17, 1992 EF1 86 km 5.0 mi 0
Apr 19, 1988 EF1 46 km 0.2 mi 0
Apr 19, 1988 EF1 22 km 1.0 mi 0
Mar 22, 1983 EF1 19 km 2.0 mi 0
Jun 28, 1970 EF1 97 km 2.3 mi 0
May 31, 1967 EF1 64 km 0.1 mi 0
Jan 14, 2023 EF0 32 km 0.3 mi 0
Nov 8, 2022 EF0 24 km 0.8 mi 0
Nov 18, 2020 EF0 32 km 4.4 mi 0
May 18, 2020 EF0 32 km 0.1 mi 0
Sep 28, 2019 EF0 35 km 1.7 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Tsunami History

3 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 30 115 km
1856 N. CALIFORNIA Eruption + Earthquake 0.6 m — 143 km
1906 N. CALIFORNIA Eruption + Earthquake 0.1 m — 138 km
Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Clear Lake (131 km).

Name Type Elevation Last Eruption Distance
Clear Lake Volcanic field 1,439 m (4,721 ft) Unknown 131 km
Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: HENNESSEY (314,241 acres, 2020).

Year Name Acres Burned Distance
2020 HENNESSEY 314,241 81 km
2021 CALDOR 226,583 95 km
2014 KING 99,070 82 km
2018 COUNTY 92,450 71 km
2022 MOSQUITO 77,858 80 km
2015 BUTTE 72,894 74 km
2017 ATLAS 51,664 79 km
2004 RUMSEY 39,335 83 km
1999 SIXTEEN 37,162 89 km
1988 49R 36,673 79 km
1988 MILLER 35,750 66 km
2013 AMERICAN 27,938 93 km
1992 CLEVELAND 21,835 86 km
2008 AMERICAN RIVER COMPLEX (GOVERNMENT) 20,709 99 km
2012 SIXTEEN COMPLEX 18,191 97 km
1992 GULCH 18,019 87 km
2004 POWER 17,266 94 km
2001 STAR 16,846 97 km
2017 CASCADE 16,155 90 km
2001 DARBY 14,734 100 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 49°F (9°C) 3.9 in Wettest
February 52°F (11°C) 3.3 in
March 55°F (13°C) 2.8 in
April 60°F (16°C) 1.2 in
May 67°F (19°C) 0.4 in
June 73°F (23°C) 0.2 in
July 78°F (26°C) 0.1 in Warmest, Driest
August 76°F (24°C) 0.1 in
September 73°F (23°C) 0.4 in
October 65°F (18°C) 1.1 in
November 54°F (12°C) 2.8 in
December 47°F (8°C) 2.6 in Coldest

Rosemont has a seasonal temperature swing of 31°F / from 47°F in December to 78°F in July. Total annual precipitation is 18.8 inches, with January being the wettest month (3.9") and July the driest (0.1").

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