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Weather & Climate in Alleghany, CA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Alleghany experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 37°F in January while summers reach 68°F in July. The area gets 297 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 4,157 feet.
Temperature
37°F Jan (3°C)
68°F Jul (20°C)
| Annual Average | 50.4°F |
| 7% below US avg | |
| January Average | 37°F (3°C) |
| July Average | 68°F (20°C) |
| Sunny Days | 297 days/yr |
Geography
| Elevation | 4,157 ft (1,267 m) |
| Area | 0.4 sq mi (0.9 km²) |
| Population Density | 100/sq mi |
| Coordinates | 39.4667°N, 120.8411°W |
| Timezone | America/Los_Angeles |
| County | Nevada County County |
| Nearest Airport | Reno/Tahoe International (RNO) 57 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 89.9 / 100 |
| Social Vulnerability | 43.5 / 100 |
| Community Resilience | 65.3 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Relatively High |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Drought | No Rating |
| Cold Wave | No Rating |
| Landslide | Relatively Moderate |
| Volcano | Very Low |
| Avalanche | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
2,403 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.1.
| Sep 12, 1994 | 4 km S of Carter Springs, Nevada | M6.1 | 125 km | 14 km |
| May 24, 2013 | 2 km NNE of Canyondam, California | M5.7 | 83 km | 8 km |
| May 11, 2023 | Lake Almanor Earthquake | M5.5 | 85 km | 6 km |
| Aug 10, 2001 | 3 km N of Blairsden, California | M5.2 | 43 km | 5 km |
| May 12, 2023 | 4km NW of Canyondam, CA | M5.2 | 84 km | 6 km |
| Sep 12, 1994 | 8 km ESE of Mesa Vista, California | M5.1 | 125 km | -1 km |
| Apr 26, 2008 | 1 km NW of Mogul, Nevada | M5.1 | 78 km | 3 km |
| Dec 22, 1995 | California-Nevada border region | M4.9 | 133 km | 4 km |
| May 24, 2013 | 1km NNW of Canyondam, CA | M4.9 | 82 km | 4 km |
| Apr 26, 2008 | 0 km N of Mogul, Nevada | M4.8 | 79 km | 3 km |
| Oct 30, 1998 | 4 km N of Tahoe Vista, California | M4.8 | 71 km | 1 km |
| Feb 10, 1993 | 28 km SW of Empire, Nevada | M4.8 | 150 km | 5 km |
| Dec 28, 1995 | 9 km WNW of Topaz Lake, Nevada | M4.8 | 132 km | -1 km |
| Jun 26, 2005 | 8 km NNW of Tahoe Vista, California | M4.8 | 67 km | -2 km |
| Dec 23, 1995 | 8 km WNW of Topaz Lake, Nevada | M4.7 | 133 km | -1 km |
| May 7, 2021 | 19km NW of Truckee, CA | M4.7 | 45 km | 10 km |
| Dec 12, 1996 | 4 km SSW of Topaz Lake, Nevada | M4.6 | 142 km | -2 km |
| Mar 21, 2020 | 5 km NE of Indian Hills, Nevada | M4.5 | 103 km | 8 km |
| Sep 20, 1994 | 9 km WNW of Topaz Lake, Nevada | M4.5 | 132 km | -1 km |
| Nov 15, 1995 | 9 km SW of Cold Springs, Nevada | M4.5 | 69 km | -1 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
52 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 7 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 25, 2011 | EF2 | 69 km | 0.2 mi | 0 |
| Feb 10, 1994 | EF2 | 63 km | 0.3 mi | 0 |
| Dec 19, 2023 | EF1 | 93 km | 0.4 mi | 0 |
| Aug 15, 2020 | EF1 | 67 km | 0.1 mi | 0 |
| Aug 14, 2020 | EF1 | 68 km | 0.4 mi | 0 |
| Dec 24, 2015 | EF1 | 88 km | 6.2 mi | 0 |
| Oct 22, 2012 | EF1 | 73 km | 0.3 mi | 0 |
| Oct 22, 2012 | EF1 | 82 km | 2.0 mi | 0 |
| Oct 22, 2012 | EF1 | 52 km | 4.0 mi | 0 |
| Jan 8, 2005 | EF1 | 63 km | 0.1 mi | 0 |
| Jan 7, 1993 | EF1 | 76 km | 0.1 mi | 0 |
| Dec 17, 1992 | EF1 | 49 km | 5.0 mi | 0 |
| Dec 17, 1992 | EF1 | 63 km | 1.0 mi | 0 |
| Apr 19, 1988 | EF1 | 92 km | 1.0 mi | 0 |
| Mar 22, 1983 | EF1 | 94 km | 2.0 mi | 0 |
| Mar 23, 1978 | EF1 | 75 km | 0.1 mi | 0 |
| Jul 16, 1973 | EF1 | 93 km | 1.0 mi | 0 |
| Jun 28, 1970 | EF1 | 83 km | 2.3 mi | 0 |
| Nov 18, 2020 | EF0 | 65 km | 0.5 mi | 0 |
| Nov 18, 2020 | EF0 | 94 km | 4.4 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Nearby Volcanoes
3 volcanoes within 200 km. Closest: Lassen Volcanic Center (127 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Lassen Volcanic Center | Stratovolcano | 3,187 m (10,456 ft) | 1917 | 127 km |
| Soda Lakes | Maar(s) | 1,251 m (4,104 ft) | Unknown | 169 km |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 175 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: DIXIE (979,795 acres, 2021).
| Year | Name | Acres Burned | Distance |
| 2021 | DIXIE | 979,795 | 95 km |
| 2020 | NORTH COMPLEX | 316,556 | 38 km |
| 2021 | CALDOR | 226,583 | 95 km |
| 2018 | CAMP | 153,687 | 70 km |
| 2021 | SUGAR | 108,368 | 79 km |
| 2014 | KING | 99,070 | 65 km |
| 2017 | LONG VALLEY | 80,456 | 98 km |
| 2012 | CHIPS | 79,978 | 76 km |
| 2022 | MOSQUITO | 77,858 | 49 km |
| 2007 | MOONLIGHT | 65,718 | 84 km |
| 2019 | WALKER | 58,747 | 73 km |
| 2008 | BTU LIGHTNING COMPLEX (LONG BRANCH-JACK) | 52,091 | 67 km |
| 2000 | STORRIE | 49,588 | 73 km |
| 1994 | COTTONWOOD | 47,912 | 58 km |
| 2020 | LOYALTON | 45,484 | 67 km |
| 1987 | CLARK | 39,194 | 85 km |
| 1988 | 49R | 36,673 | 40 km |
| 1999 | MHRD COMPLEX (BUCKS) | 34,459 | 62 km |
| 2020 | NORTH | 34,120 | 85 km |
| 2020 | SHEEP | 29,150 | 95 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 37°F (3°C) | 11.1 in | Coldest, Wettest |
| February | 42°F (5°C) | 8.3 in | |
| March | 43°F (6°C) | 7.6 in | |
| April | 48°F (9°C) | 4.3 in | |
| May | 55°F (13°C) | 1.9 in | |
| June | 62°F (17°C) | 0.8 in | |
| July | 68°F (20°C) | 0.1 in | Driest |
| August | 69°F (21°C) | 0.4 in | Warmest |
| September | 65°F (18°C) | 0.9 in | |
| October | 57°F (14°C) | 3.4 in | |
| November | 46°F (8°C) | 8.0 in | |
| December | 41°F (5°C) | 9.8 in |
Alleghany has a seasonal temperature swing of 32°F / from 37°F in January to 69°F in August. Total annual precipitation is 56.5 inches, with January being the wettest month (11.1") and July the driest (0.1").