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Weather & Climate in Castle Valley, UT
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Castle Valley experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 28°F in January while summers reach 82°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 12.3 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 4,779 feet.
Temperature
28°F Jan (-2°C)
82°F Jul (28°C)
| Annual Average | 54.7°F |
| 1% above US avg | |
| January Average | 28°F (-2°C) |
| July Average | 82°F (28°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 4,779 ft (1,457 m) |
| Area | 8.0 sq mi (20.8 km²) |
| Population Density | 40/sq mi |
| Coordinates | 38.6321°N, 109.3960°W |
| Timezone | America/Denver |
| County | Grand County County |
| Nearest Airport | Canyonlands Regional (CNY) 21 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 10.3 / 100 |
| Social Vulnerability | 31.2 / 100 |
| Community Resilience | 44.5 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively High |
| Ice Storm | Very Low |
| Drought | Relatively Low |
| Cold Wave | Very Low |
| Landslide | Relatively Low |
| Volcano | No Rating |
| Avalanche | Relatively Moderate |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
113 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.5.
| Mar 4, 2019 | 29 km E of La Sal, Utah | M4.5 | 58 km | 1 km |
| May 27, 2000 | 29 km WNW of Naturita, Colorado | M4.4 | 59 km | 10 km |
| Sep 13, 1994 | 17 km N of Sawpit, Colorado | M4.4 | 135 km | 10 km |
| Jan 6, 1996 | 15 km SE of Castle Dale, Utah | M3.9 | 139 km | 6 km |
| Jan 24, 2013 | 22 km E of La Sal, Utah | M3.9 | 49 km | 1 km |
| Mar 1, 2016 | 34 km N of Halls Crossing, Utah | M3.8 | 145 km | 15 km |
| May 31, 2022 | 37 km ENE of Thompson Springs, Utah | M3.8 | 49 km | 7 km |
| Jul 6, 1999 | 27 km WNW of Naturita, Colorado | M3.7 | 60 km | 2 km |
| Jun 3, 1999 | 28 km E of La Sal, Utah | M3.7 | 56 km | 1 km |
| Jun 6, 2008 | 10 km NE of Bluff, Utah | M3.6 | 142 km | 12 km |
| Oct 14, 1993 | 36 km SW of Spanish Valley, Utah | M3.6 | 51 km | 5 km |
| Aug 11, 1992 | 4 km N of Sunnyside, Utah | M3.6 | 137 km | 6 km |
| Jan 27, 2006 | 13 km ESE of Castle Dale, Utah | M3.6 | 141 km | 18 km |
| Nov 20, 1990 | 15 km SE of Castle Dale, Utah | M3.4 | 139 km | 9 km |
| Aug 2, 1991 | 59 km WNW of Blanding, Utah | M3.4 | 111 km | 6 km |
| Apr 3, 2025 | 34 km W of Delta, Colorado | M3.2 | 81 km | 5 km |
| Dec 15, 1997 | 7 km ENE of La Sal, Utah | M3.2 | 39 km | 6 km |
| Apr 10, 2019 | 14 km SE of Clawson, Utah | M3.2 | 144 km | 17 km |
| Feb 24, 1993 | 16 km SSE of Monticello, Utah | M3.1 | 101 km | -1 km |
| May 13, 1993 | 19 km SSE of Monticello, Utah | M3.1 | 104 km | -3 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
18 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2.
| Date | Rating | Distance | Path | Fatalities |
| Jun 10, 1970 | EF2 | 45 km | 0.1 mi | 0 |
| May 4, 1961 | EF2 | 77 km | 9.4 mi | 0 |
| Oct 4, 2005 | EF1 | 56 km | 0.7 mi | 0 |
| Oct 6, 2010 | EF0 | 86 km | 1.2 mi | 0 |
| Sep 22, 2006 | EF0 | 38 km | 0.2 mi | 0 |
| Jun 8, 2006 | EF0 | 81 km | 0.5 mi | 0 |
| Aug 2, 2005 | EF0 | 82 km | 0.3 mi | 0 |
| May 29, 2005 | EF0 | 84 km | 1.0 mi | 0 |
| Oct 17, 2004 | EF0 | 83 km | 7.5 mi | 0 |
| Jun 3, 2002 | EF0 | 87 km | 0.5 mi | 0 |
| Sep 8, 2000 | EF0 | 37 km | 2.0 mi | 0 |
| Apr 18, 2000 | EF0 | 13 km | 0.5 mi | 0 |
| Apr 15, 2000 | EF0 | 82 km | 0.2 mi | 0 |
| Apr 11, 2000 | EF0 | 97 km | 0.1 mi | 0 |
| Aug 8, 1998 | EF0 | 83 km | 0.1 mi | 0 |
| Jul 26, 1991 | EF0 | 87 km | 0.1 mi | 0 |
| Jul 26, 1991 | EF0 | 83 km | 0.1 mi | 0 |
| Aug 31, 1986 | EF0 | 66 km | 0.2 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: RATTLE COMPLEX (RATTLE) (87,396 acres, 2002).
| Year | Name | Acres Burned | Distance |
| 2002 | RATTLE COMPLEX (RATTLE) | 87,396 | 71 km |
| 2018 | BULL DRAW | 37,178 | 66 km |
| 1989 | DIAMONDPK | 15,685 | 76 km |
| 2001 | INDIAN SPR | 13,458 | 98 km |
| 2018 | BEAR TRAP | 9,215 | 85 km |
| 2021 | PACK CREEK | 8,859 | 20 km |
| 1986 | UNNAMED | 6,205 | 90 km |
| 2002 | BLACK CANYON | 6,078 | 76 km |
| 1999 | TOMS CYN | 6,030 | 52 km |
| 2012 | SUNRISE MINE | 5,905 | 40 km |
| 1995 | TRIANGLE | 5,688 | 43 km |
| 2002 | CANYONS COMPLEX (HANG DOG) | 5,668 | 38 km |
| 1990 | FLORENCE | 5,123 | 90 km |
| 2000 | CONE MOUNTAIN | 4,708 | 35 km |
| 1994 | BITTCRCOMP | 4,445 | 82 km |
| 2004 | CAMPBELL | 4,429 | 76 km |
| 1994 | TWO ROAD | 4,240 | 72 km |
| 2010 | MOONWATER POINT | 4,200 | 95 km |
| 2023 | COWCREEKRXNORTH | 4,147 | 53 km |
| 2023 | LITTLE MESA | 4,048 | 93 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 28°F (-2°C) | 0.9 in | Coldest |
| February | 34°F (1°C) | 0.7 in | |
| March | 42°F (6°C) | 1.1 in | |
| April | 50°F (10°C) | 0.9 in | |
| May | 59°F (15°C) | 0.9 in | |
| June | 70°F (21°C) | 0.5 in | Driest |
| July | 82°F (28°C) | 1.1 in | Warmest |
| August | 75°F (24°C) | 1.2 in | |
| September | 66°F (19°C) | 1.1 in | |
| October | 53°F (12°C) | 1.3 in | Wettest |
| November | 39°F (4°C) | 1.0 in | |
| December | 30°F (-1°C) | 0.9 in |
Castle Valley has a seasonal temperature swing of 53°F / from 28°F in January to 82°F in July. Total annual precipitation is 11.6 inches, with October being the wettest month (1.3") and June the driest (0.5").