Weather & Climate in Pompeys Pillar, MT

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

Pompeys Pillar experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 24°F in January while summers reach 73°F in July. The area gets 311 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 13.8 inches (drier than the 38-inch national average). The area receives 27.9 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 26 / among the cleanest air in the country. The city sits at an elevation of 2,892 feet.

Temperature

24°F Jan (-5°C) 73°F Jul (23°C)

Annual Average	47.7°F
	12% below US avg
January Average	24°F (-5°C)
July Average	73°F (23°C)
Sunny Days	311 days/yr

Geography

Elevation	2,892 ft (881 m)
Area	0.2 sq mi (0.5 km²)
Population Density	125/sq mi
Coordinates	45.9906°N, 107.9504°W
Timezone	America/Denver
County	Big Horn County County
Nearest Airport	Billings Logan International (BIL) 31 miles away

Precipitation & Snow

Annual Rainfall 13.8"

64% below US avg

Snowfall 27.9"

Wettest Month (May) 2.72"

Driest Month (Feb) 0.59"

Air Quality

AQI Median	26.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	57.2 / 100
Social Vulnerability	94.2 / 100
Community Resilience	4.8 / 100

Hazard Breakdown

Tornado	Very Low
Earthquake	Very Low
Wildfire	Relatively Moderate
Flood	Relatively Low
Hail	Relatively Low
Strong Wind	Relatively High
Heat Wave	Very Low
Winter Weather	Relatively High
Lightning	Relatively High
Ice Storm	Very Low
Drought	Relatively Low
Cold Wave	Relatively Moderate
Landslide	Relatively Low
Volcano	Very Low
Avalanche	Very Low

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

Earthquake History

10 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.6.

Jul 6, 2021	27 km SSE of Melstone, Montana	M3.6	45 km	10 km
Dec 23, 1991	10 km SW of Colstrip, Montana	M3.6	98 km	5 km
Jul 21, 2023	Eastern Montana	M3.2	89 km	5 km
May 21, 2013	32 km NE of Melstone, Montana	M2.8	93 km	7 km
Mar 30, 2018	20 km NNE of Sheridan, Wyoming	M2.8	144 km	5 km
Jan 15, 2023	6 km NE of Ashland, Montana	M2.8	141 km	11 km
May 19, 2017	6 km ESE of Birney, Montana	M2.7	141 km	3 km
Jan 6, 2016	27 km ENE of Lovell, Wyoming	M2.6	115 km	12 km
Jun 2, 2019	14 km WSW of Birney, Montana	M2.6	126 km	5 km
Apr 22, 2018	8 km ENE of Ashland, Montana	M2.6	145 km	5 km

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

Tornado History

42 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 3 injuries.

Date	Rating	Distance	Path	Fatalities
Jun 16, 1965	EF3	48 km	20.6 mi	0
Jun 20, 2010	EF2	46 km	0.7 mi	0
May 4, 1986	EF2	41 km	0.1 mi	0
Jul 2, 1958	EF2	46 km	0.5 mi	0
May 21, 2016	EF1	28 km	2.0 mi	0
Jun 22, 1996	EF1	38 km	4.0 mi	0
Jul 9, 1991	EF1	40 km	0.1 mi	0
Jun 21, 1991	EF1	33 km	0.2 mi	0
Jun 21, 1991	EF1	53 km	0.2 mi	0
May 24, 1990	EF1	35 km	0.2 mi	0
Jun 21, 1984	EF1	93 km	1.0 mi	0
Aug 12, 1958	EF1	73 km	0.5 mi	0
Jul 6, 1955	EF1	59 km	2.0 mi	0
Jul 6, 1955	EF1	30 km	2.0 mi	0
Jul 8, 2013	EF0	69 km	0.5 mi	0
Jun 6, 2011	EF0	69 km	0.0 mi	0
Jun 6, 2011	EF0	38 km	0.3 mi	0
Aug 11, 2005	EF0	86 km	9.0 mi	0
Aug 26, 2004	EF0	55 km	—	0
Jul 26, 2003	EF0	50 km	2.5 mi	0

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

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: HAWK CREEK (157,778 acres, 1984).

Year	Name	Acres Burned	Distance
1984	HAWK CREEK	157,778	39 km
2012	CHALKY	132,680	93 km
2008	DUNN MTN. ASSIST	105,494	31 km
2006	PINE RIDGE COMPLEX	103,074	22 km
2006	BUNDY RAILROAD	91,575	17 km
2012	SARPY HILLS COMPLEX	83,942	66 km
2021	P F	66,375	44 km
2020	SARPY	51,619	82 km
2012	DELPHIA	40,396	49 km
2020	BOBCAT	31,020	48 km
1999	FISHEL CREEK	28,611	60 km
2003	LITTLEHAWK	27,926	88 km
2021	MUSSELSHELL TRAIL RD	22,723	35 km
2012	DAHL	21,448	57 km
2011	BLACK SPRINGS COMPLEX	19,473	96 km
2022	BUSMAN ROAD	12,584	54 km
1996	ROLLOVER	10,743	81 km
2020	GASS FLATS	10,723	56 km
2021	SLOUGH GRASS	9,384	87 km
1991	UNNAMED	9,027	66 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	24°F (-5°C)	0.7 in	Coldest
February	27°F (-3°C)	0.6 in	Driest
March	35°F (2°C)	1.0 in
April	45°F (7°C)	1.8 in
May	55°F (13°C)	2.7 in	Wettest
June	64°F (18°C)	2.1 in
July	73°F (23°C)	1.3 in	Warmest
August	71°F (22°C)	1.1 in
September	60°F (16°C)	1.7 in
October	48°F (9°C)	1.2 in
November	34°F (1°C)	0.8 in
December	25°F (-4°C)	0.7 in

Pompeys Pillar has a seasonal temperature swing of 49°F / from 24°F in January to 73°F in July. Total annual precipitation is 15.7 inches, with May being the wettest month (2.7") and February the driest (0.6").

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