Weather & Climate in Roy, UT

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

Roy experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 29°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 16.4 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 4,377 feet.

Temperature

29°F Jan (-2°C) 78°F Jul (26°C)

Annual Average	51.7°F
	4% below US avg
January Average	29°F (-2°C)
July Average	78°F (26°C)
Sunny Days	316 days/yr

Geography

Elevation	4,377 ft (1,334 m)
Area	7.8 sq mi (20.3 km²)
Population Density	4,788/sq mi
Coordinates	41.1715°N, 112.0485°W
Timezone	America/Denver
County	Davis County County
Nearest Airport	Brigham City Regional (BMC) 26 miles away

Precipitation & Snow

Annual Rainfall 16.4"

57% below US avg

Wettest Month (May) 2.36"

Driest Month (Jul) 0.75"

Air Quality

AQI Median	41.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Moderate
Risk Score	87.8 / 100
Social Vulnerability	10.6 / 100
Community Resilience	97.9 / 100

Hazard Breakdown

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

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

Earthquake History

379 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	47 km	12 km
Apr 15, 2010	9 km NE of Randolph, Utah	M4.9	100 km	10 km
Nov 4, 1992	67 km ENE of Montello, Nevada	M4.7	124 km	9 km
Mar 18, 2020	6 km NNE of Magna, Utah	M4.6	46 km	9 km
Mar 18, 2020	5 km NE of Magna, Utah	M4.6	47 km	11 km
May 5, 2024	16 km SW of Thatcher, Utah	M4.4	55 km	7 km
Jun 30, 2006	12 km WSW of Georgetown, Idaho	M4.3	147 km	10 km
Apr 16, 2020	4 km NE of Magna, Utah	M4.2	49 km	10 km
Mar 16, 1992	6 km S of Herriman, Utah	M4.2	79 km	12 km
Mar 18, 2020	1 km NNW of Magna, Utah	M4.2	50 km	9 km
Apr 15, 2020	4 km NE of Magna, Utah	M4.2	49 km	9 km
May 25, 2016	15 km NNE of Tabiona, Utah	M4.0	140 km	16 km
Mar 18, 2020	4 km NNE of Magna, Utah	M4.0	47 km	7 km
Jun 3, 2009	5 km WNW of Riverside, Utah	M4.0	72 km	9 km
Jul 14, 2006	14 km WSW of Georgetown, Idaho	M4.0	146 km	6 km
May 1, 2025	4 km WNW of Independence, Utah	M3.9	114 km	14 km
Mar 23, 2020	8 km NNE of Magna, Utah	M3.9	44 km	10 km
Mar 18, 2020	4 km NNE of Magna, Utah	M3.9	47 km	9 km
May 4, 2024	16 km SW of Thatcher, Utah	M3.9	55 km	6 km
Sep 24, 2019	5 km ENE of Howell, Utah	M3.9	77 km	7 km

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

Tornado History

54 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 1 fatality, 96 injuries.

Date	Rating	Distance	Path	Fatalities
Aug 11, 1999	EF2	51 km	4.3 mi	1
Aug 14, 1968	EF2	9 km	1.5 mi	0
Feb 9, 1965	EF2	50 km	0.1 mi	0
Jun 3, 1963	EF2	35 km	2.0 mi	0
Sep 2, 2021	EF1	36 km	2.1 mi	0
Sep 22, 2016	EF1	3 km	2.9 mi	0
Aug 20, 1998	EF1	48 km	0.1 mi	0
May 29, 1996	EF1	16 km	1.3 mi	0
Jun 2, 1993	EF1	40 km	1.0 mi	0
May 3, 1993	EF1	65 km	0.1 mi	0
Sep 23, 1992	EF1	10 km	2.0 mi	0
Jul 25, 1991	EF1	68 km	10.0 mi	0
Sep 17, 1989	EF1	90 km	0.2 mi	0
Jul 8, 1989	EF1	65 km	0.2 mi	0
Mar 2, 1989	EF1	53 km	0.2 mi	0
Jan 10, 1989	EF1	67 km	0.2 mi	0
May 29, 1987	EF1	91 km	0.2 mi	0
May 6, 1981	EF1	78 km	0.5 mi	0
Dec 2, 1970	EF1	94 km	1.0 mi	0
Aug 14, 1968	EF1	47 km	0.1 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	—	89 km

Source: NOAA/NCEI Historical Tsunami Database.

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: DALLAS CANYON (43,386 acres, 2012).

Year	Name	Acres Burned	Distance
2012	DALLAS CANYON	43,386	97 km
2009	BIG POLE	41,579	81 km
2000	SALT LAKE DESERT COMPLEX (ARAGONITE)	39,825	93 km
2001	UNNAMED	38,647	56 km
1995	REDLAM	35,405	88 km
1994	ELEVATOR	31,854	95 km
1995	PUDDLE VALLEY	31,249	80 km
2013	STATE	31,011	98 km
2013	PATCH SPRINGS	29,562	98 km
2007	MONARCH	25,046	72 km
2017	CEDAR MOUNTAIN	21,388	94 km
2016	BROAD MOUTH	21,009	80 km
2005	SALLY	19,726	71 km
1996	SILVER HILL	17,137	71 km
2007	KIMBELL	16,949	72 km
2000	CASTLEROCK	16,718	53 km
1996	GOLDEN SPIKE	16,186	60 km
2011	LAKESIDE	16,165	70 km
2016	WEST ANTELOPE	15,483	31 km
2018	GORING	14,538	80 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	29°F (-2°C)	1.7 in	Coldest
February	32°F (0°C)	1.6 in
March	42°F (5°C)	1.9 in
April	49°F (10°C)	2.0 in
May	58°F (15°C)	2.4 in	Wettest
June	68°F (20°C)	1.1 in
July	78°F (26°C)	0.8 in	Warmest, Driest
August	74°F (23°C)	0.9 in
September	64°F (18°C)	1.5 in
October	51°F (11°C)	1.9 in
November	39°F (4°C)	1.7 in
December	29°F (-2°C)	1.5 in

Roy has a seasonal temperature swing of 50°F / from 29°F in January to 78°F in July. Total annual precipitation is 18.8 inches, with May being the wettest month (2.4") and July the driest (0.8").

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