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Weather & Climate in Round Valley, CA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Round Valley enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 40°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 4.8 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 4,566 feet.
Temperature
40°F Jan (4°C)
78°F Jul (26°C)
| Annual Average | 57.3°F |
| 6% above US avg | |
| January Average | 40°F (4°C) |
| July Average | 78°F (26°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 4,566 ft (1,392 m) |
| Area | 13.8 sq mi (35.8 km²) |
| Population Density | 37/sq mi |
| Coordinates | 37.4142°N, 118.5723°W |
| Timezone | America/Los_Angeles |
| County | Mono County County |
| Nearest Airport | Fresno Yosemite International (FAT) 77 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 46.5 / 100 |
| Social Vulnerability | 23.4 / 100 |
| Community Resilience | 65.7 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Relatively Moderate |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| Drought | Relatively Moderate |
| Cold Wave | Very Low |
| Landslide | Relatively Low |
| Volcano | Relatively Low |
| Avalanche | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
7,167 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.5.
| May 15, 2020 | Monte Cristo Range, NV Earthquake | M6.5 | 105 km | 3 km |
| May 17, 1993 | 46km E of Big Pine, California | M6.1 | 76 km | 4 km |
| Jul 8, 2021 | Antelope Valley, CA | M6.0 | 146 km | 7 km |
| Oct 24, 1990 | 3 km NE of Mono City, California | M5.8 | 87 km | 11 km |
| Jun 24, 2020 | 18km SSE of Lone Pine, CA | M5.8 | 120 km | 5 km |
| Aug 1, 1999 | 37 km SSE of Goldfield, Nevada | M5.7 | 132 km | 8 km |
| May 15, 1999 | 9 km WSW of Aspen Springs, California | M5.5 | 25 km | 3 km |
| Nov 2, 1997 | 16 km NNW of Dyer, Nevada | M5.4 | 57 km | 5 km |
| Sep 18, 2004 | 27 km NW of Benton, California | M5.4 | 67 km | 3 km |
| Sep 18, 2004 | 27 km NW of Benton, California | M5.4 | 68 km | 0 km |
| Apr 11, 2020 | 30km SE of Bodie, CA | M5.2 | 72 km | 8 km |
| Oct 3, 2009 | 18km NE of Olancha, CA | M5.2 | 130 km | -2 km |
| May 22, 2020 | 32 km ESE of Mina, Nevada | M5.1 | 114 km | 7 km |
| Aug 2, 1999 | 39 km SSE of Goldfield, Nevada | M5.1 | 133 km | 3 km |
| Feb 13, 2013 | 39 km N of Dyer, Nevada | M5.1 | 82 km | 8 km |
| May 15, 2020 | 31 km SE of Mina, Nevada | M5.1 | 105 km | 7 km |
| Jul 8, 2021 | 32km SE of Markleeville, CA | M5.0 | 147 km | 7 km |
| Jun 30, 2020 | 29 km SSE of Mina, Nevada | M5.0 | 98 km | 8 km |
| Oct 1, 2009 | 18km NE of Olancha, CA | M5.0 | 131 km | 4 km |
| May 20, 2020 | 38 km ESE of Mina, Nevada | M5.0 | 114 km | 12 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
6 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2.
| Date | Rating | Distance | Path | Fatalities |
| Sep 5, 2020 | EF2 | 68 km | 12.0 mi | 0 |
| Sep 5, 2020 | EF1 | 58 km | 1.1 mi | 0 |
| Mar 3, 2018 | EF0 | 16 km | 0.1 mi | 0 |
| Nov 30, 2012 | EF0 | 60 km | 1.6 mi | 0 |
| Jul 7, 2004 | EF0 | 89 km | — | 0 |
| Aug 27, 1982 | EF0 | 91 km | 0.2 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Nearby Volcanoes
5 volcanoes within 200 km. Closest: Mammoth Mountain (47 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Mammoth Mountain | Lava dome(s) | 3,369 m (11,053 ft) | 1260 | 47 km |
| Mono-Inyo Craters | Lava dome(s) | 2,796 m (9,173 ft) | 1380 | 59 km |
| Mono Lake Volcanic Field | Pyroclastic cone(s) | 2,121 m (6,959 ft) | 1790 | 77 km |
| Ubehebe Craters | Maar(s) | 752 m (2,467 ft) | -150 | 109 km |
| Golden Trout Creek | Volcanic field | 2,886 m (9,469 ft) | -5550 | 120 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: CREEK (381,441 acres, 2020).
| Year | Name | Acres Burned | Distance |
| 2020 | CREEK | 381,441 | 58 km |
| 2015 | ROUGH | 146,369 | 68 km |
| 2021 | KNP COMPLEX | 89,960 | 95 km |
| 2007 | INYO COMPLEX (OAK) | 28,447 | 68 km |
| 2013 | ASPEN | 23,564 | 63 km |
| 2014 | FRENCH | 14,534 | 71 km |
| 2018 | LIONS | 14,252 | 56 km |
| 2013 | SPRING PEAK | 13,901 | 97 km |
| 2017 | RAILROAD | 12,765 | 92 km |
| 2012 | INDIAN | 12,655 | 65 km |
| 2008 | TEHIPITE | 12,205 | 57 km |
| 1989 | POWERHOUSE | 11,532 | 86 km |
| 1986 | DEER | 10,963 | 69 km |
| 2019 | TABOOSE | 10,401 | 48 km |
| 2005 | COMB COMPLEX | 10,211 | 66 km |
| 2017 | EMPIRE | 9,685 | 93 km |
| 2010 | SHEEP COMPLEX | 9,614 | 71 km |
| 2001 | HOOVER COMPLEX (HOOVER) | 9,163 | 85 km |
| 1989 | UNNAMED | 8,742 | 72 km |
| 1985 | ONION | 8,583 | 80 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (4°C) | 2.2 in | Wettest |
| February | 37°F (3°C) | 1.9 in | |
| March | 41°F (5°C) | 1.4 in | |
| April | 46°F (8°C) | 0.7 in | |
| May | 54°F (12°C) | 0.5 in | |
| June | 64°F (18°C) | 0.4 in | Driest |
| July | 78°F (26°C) | 0.4 in | Warmest |
| August | 70°F (21°C) | 0.4 in | |
| September | 63°F (17°C) | 0.6 in | |
| October | 53°F (11°C) | 0.5 in | |
| November | 42°F (5°C) | 1.4 in | |
| December | 34°F (1°C) | 1.7 in | Coldest |
Round Valley has a seasonal temperature swing of 44°F / from 34°F in December to 78°F in July. Total annual precipitation is 11.9 inches, with January being the wettest month (2.2") and June the driest (0.4").