Weather & Climate in Grantsville, UT

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

Grantsville experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 30°F in January while summers reach 78°F in July. The area gets 316 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 18.4 inches (drier than the 38-inch national average). The area receives 75.3 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 4,265 feet.

Temperature

30°F Jan (-1°C) 78°F Jul (25°C)

Annual Average	52.0°F
	4% below US avg
January Average	30°F (-1°C)
July Average	78°F (25°C)
Sunny Days	316 days/yr

Geography

Elevation	4,265 ft (1,300 m)
Area	19.4 sq mi (50.2 km²)
Population Density	342/sq mi
Coordinates	40.6113°N, 112.4691°W
Timezone	America/Denver
County	Salt Lake County County
Nearest Airport	Salt Lake City International (SLC) 28 miles away

Precipitation & Snow

Annual Rainfall 18.4"

51% below US avg

Snowfall 75.3"

Wettest Month (Apr) 1.77"

Driest Month (Jul) 0.71"

Air Quality

AQI Median	41.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively High
Risk Score	98.6 / 100
Social Vulnerability	10.6 / 100
Community Resilience	66.4 / 100

Hazard Breakdown

Tornado	Relatively Moderate
Earthquake	Relatively High
Wildfire	Relatively High
Flood	Relatively Moderate
Hail	Relatively Low
Strong Wind	Relatively Moderate
Heat Wave	Relatively Moderate
Winter Weather	Very High
Lightning	Relatively High
Ice Storm	Very Low
Drought	Relatively Low
Cold Wave	Relatively Low
Landslide	Relatively Low
Coastal Flood	No Rating
Volcano	Very Low
Avalanche	Very High

Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

393 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.7.

Mar 18, 2020	5 km NNE of Magna, Utah	M5.7	36 km	12 km
Nov 4, 1992	67 km ENE of Montello, Nevada	M4.7	131 km	9 km
Mar 18, 2020	6 km NNE of Magna, Utah	M4.6	38 km	9 km
Mar 18, 2020	5 km NE of Magna, Utah	M4.6	38 km	11 km
May 5, 2024	16 km SW of Thatcher, Utah	M4.4	108 km	7 km
Apr 17, 2003	6 km SSW of Levan, Utah	M4.2	133 km	1 km
Apr 16, 2020	4 km NE of Magna, Utah	M4.2	37 km	10 km
Mar 18, 2020	1 km NNW of Magna, Utah	M4.2	33 km	9 km
Apr 15, 2020	4 km NE of Magna, Utah	M4.2	37 km	9 km
Mar 16, 1992	6 km S of Herriman, Utah	M4.2	40 km	12 km
Mar 18, 2020	4 km NNE of Magna, Utah	M4.0	36 km	7 km
Jun 3, 2009	5 km WNW of Riverside, Utah	M4.0	135 km	9 km
Mar 18, 2020	4 km NNE of Magna, Utah	M3.9	36 km	9 km
Mar 23, 2020	8 km NNE of Magna, Utah	M3.9	40 km	10 km
May 1, 2025	4 km WNW of Independence, Utah	M3.9	104 km	14 km
May 4, 2024	16 km SW of Thatcher, Utah	M3.9	107 km	6 km
Sep 24, 2019	5 km ENE of Howell, Utah	M3.9	134 km	7 km
Mar 18, 2020	6 km NE of Magna, Utah	M3.9	39 km	10 km
Jun 28, 1990	11 km NNE of Howell, Utah	M3.8	143 km	6 km
Mar 18, 2020	5 km NNE of Magna, Utah	M3.7	37 km	10 km

Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

47 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 1 fatality, 90 injuries.

Date	Rating	Distance	Path	Fatalities
Aug 11, 1999	EF2	52 km	4.3 mi	1
Aug 14, 1968	EF2	78 km	1.5 mi	0
Feb 9, 1965	EF2	33 km	0.1 mi	0
Jun 3, 1963	EF2	58 km	2.0 mi	0
Sep 2, 2021	EF1	53 km	2.1 mi	0
Sep 22, 2016	EF1	73 km	2.9 mi	0
May 29, 1996	EF1	87 km	1.3 mi	0
Jun 2, 1993	EF1	52 km	1.0 mi	0
May 3, 1993	EF1	14 km	0.1 mi	0
Sep 23, 1992	EF1	62 km	2.0 mi	0
Jul 25, 1991	EF1	19 km	10.0 mi	0
Jul 8, 1989	EF1	48 km	0.2 mi	0
Mar 2, 1989	EF1	33 km	0.2 mi	0
Jan 10, 1989	EF1	50 km	0.2 mi	0
Dec 2, 1970	EF1	79 km	1.0 mi	0
Aug 14, 1968	EF1	53 km	0.1 mi	0
Apr 17, 1966	EF1	91 km	0.1 mi	0
Jul 9, 1965	EF1	81 km	0.4 mi	0
Sep 7, 2013	EF0	64 km	0.1 mi	0
May 3, 2009	EF0	95 km	1.0 mi	0

Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Tsunami History

1 tsunami recorded within 500 km. Highest wave on record: 3.6 m (12 ft).

Year	Location	Cause	Max Wave	Deaths	Distance
1909	UTAH	Earthquake	3.6 m	—	134 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

1 volcano within 200 km. Closest: Black Rock Desert (183 km).

Name	Type	Elevation	Last Eruption	Distance
Black Rock Desert	Volcanic field	1,800 m (5,906 ft)	1290	183 km

Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: LEAMINGTON COMPLEX (WASH) (161,203 acres, 1996).

Year	Name	Acres Burned	Distance
1996	LEAMINGTON COMPLEX (WASH)	161,203	97 km
2012	DALLAS CANYON	43,386	41 km
2009	BIG POLE	41,579	16 km
2000	SALT LAKE DESERT COMPLEX (ARAGONITE)	39,825	41 km
1994	SIMPSON BT	36,917	62 km
1995	REDLAM	35,405	39 km
2017	DAVIS	35,071	46 km
1996	DAVIS KNOLL COMPLEX (DAVIS KNOLL)	34,843	46 km
1995	PUDDLE VALLEY	31,249	45 km
2013	PATCH SPRINGS	29,562	26 km
2000	OLDROYD COMPLEX (MONA WEST)	28,774	96 km
2007	MONARCH	25,046	48 km
2007	QUINCY	24,776	51 km
2012	FAUST	22,155	49 km
2005	DITTO	22,041	70 km
2017	CEDAR MOUNTAIN	21,388	41 km
1998	TEKOI	19,933	39 km
2005	SALLY	19,726	67 km
1994	POSTHOLLOW	18,234	44 km
1998	SIMPSON SPRINGS	17,543	69 km

Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	30°F (-1°C)	1.0 in
February	34°F (1°C)	1.1 in
March	42°F (6°C)	1.6 in
April	50°F (10°C)	1.8 in	Wettest
May	59°F (15°C)	1.7 in
June	70°F (21°C)	0.9 in
July	78°F (25°C)	0.7 in	Warmest, Driest
August	76°F (25°C)	0.8 in
September	65°F (18°C)	1.1 in
October	52°F (11°C)	1.4 in
November	39°F (4°C)	1.4 in
December	30°F (-1°C)	1.1 in	Coldest

Grantsville has a seasonal temperature swing of 48°F / from 30°F in December to 78°F in July. Total annual precipitation is 14.5 inches, with April being the wettest month (1.8") and July the driest (0.7").

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