Weather & Climate in Newcastle, WY

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

Newcastle experiences four distinct seasons with an average annual temperature of 47°F (9°C). Winters average 24°F in January while summers reach 73°F in July. The area gets 302 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 17.2 inches (drier than the 38-inch national average). The area receives 38.9 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 34. The city sits at an elevation of 4,376 feet.

Temperature

24°F Jan (-4°C) 73°F Jul (23°C)

Annual Average	47.3°F
	12% below US avg
January Average	24°F (-4°C)
July Average	73°F (23°C)
Sunny Days	302 days/yr

Geography

Elevation	4,376 ft (1,334 m)
Area	2.6 sq mi (6.6 km²)
Population Density	1,308/sq mi
Coordinates	43.8503°N, 104.1965°W
Timezone	America/Denver
County	Weston County County
Nearest Airport	Ellsworth Afb (RCA) 58 miles away

Precipitation & Snow

Annual Rainfall 17.2"

55% below US avg

Snowfall 38.9"

Wettest Month (May) 2.72"

Driest Month (Jan) 0.47"

Air Quality

AQI Median	34.0
Rating	Good

Natural Hazard Risk

Overall Risk	Very Low
Risk Score	7.9 / 100
Social Vulnerability	21.3 / 100
Community Resilience	3.3 / 100

Hazard Breakdown

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

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

Earthquake History

29 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.2.

Sep 25, 2009	15 km E of Alzada, Montana	M4.2	130 km	5 km
Jan 28, 1990	8 km N of Manderson-White Horse Creek, South Dakota	M4.0	149 km	5 km
Aug 29, 2004	16 km NNW of Douglas, Wyoming	M3.8	150 km	5 km
Apr 9, 1996	34 km SW of Edgemont, South Dakota	M3.7	87 km	5 km
Feb 6, 1996	13 km WNW of Hill City, South Dakota	M3.7	40 km	5 km
Mar 9, 2025	7 km W of Fairburn, South Dakota	M3.6	75 km	5 km
Dec 12, 2013	10 km WSW of Hermosa, South Dakota	M3.5	71 km	5 km
Feb 15, 2004	19 km N of Douglas, Wyoming	M3.5	141 km	10 km
Mar 26, 2021	10 km E of Edgemont, South Dakota	M3.4	72 km	5 km
Mar 2, 1990	7 km N of Manderson-White Horse Creek, South Dakota	M3.2	150 km	5 km
May 3, 1996	32 km SSW of Edgemont, South Dakota	M3.1	91 km	5 km
Feb 7, 2007	11 km WSW of Wasta, South Dakota	M3.1	131 km	5 km
May 10, 2013	25 km NW of Wright, Wyoming	M3.1	121 km	9 km
Jun 29, 2024	22 km ESE of Hill View Heights, Wyoming	M3.0	26 km	10 km
Jan 16, 2012	25 km E of Buffalo Gap, South Dakota	M3.0	105 km	5 km
Sep 27, 2016	43 km WSW of Gillette, Wyoming	M3.0	149 km	14 km
Nov 2, 1992	5 km ESE of Lusk, Wyoming	M3.0	124 km	5 km
Jun 30, 1993	25 km N of Douglas, Wyoming	M3.0	135 km	5 km
Jun 16, 2024	7 km NNE of Buffalo Gap, South Dakota	M2.9	82 km	8 km
Mar 10, 2011	22 km N of Van Tassell, Wyoming	M2.9	110 km	5 km

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

Tornado History

191 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 49 injuries.

Date	Rating	Distance	Path	Fatalities
Jun 29, 1993	EF3	59 km	3.0 mi	0
May 11, 1991	EF3	87 km	2.0 mi	0
Jun 25, 1975	EF3	44 km	11.5 mi	0
Jul 18, 1965	EF3	98 km	0.1 mi	0
Jul 12, 1965	EF3	45 km	20.8 mi	0
Jul 6, 2020	EF2	50 km	2.1 mi	0
Jul 6, 2020	EF2	50 km	5.1 mi	0
Jun 13, 2016	EF2	76 km	7.4 mi	0
Jun 22, 2012	EF2	88 km	16.7 mi	0
Jul 13, 2009	EF2	84 km	9.4 mi	0
Jul 12, 1993	EF2	80 km	2.0 mi	0
May 11, 1991	EF2	86 km	1.0 mi	0
May 6, 1988	EF2	99 km	1.5 mi	0
May 10, 1985	EF2	39 km	1.0 mi	0
May 31, 1984	EF2	78 km	0.5 mi	0
Jun 5, 1982	EF2	80 km	7.0 mi	0
Jun 5, 1982	EF2	97 km	1.0 mi	0
Jul 28, 1978	EF2	99 km	5.0 mi	0
Jun 28, 1972	EF2	87 km	0.1 mi	0
Jul 23, 1969	EF2	65 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: JASPER (82,298 acres, 2000).

Year	Name	Acres Burned	Distance
2000	JASPER	82,298	26 km
2012	OIL CREEK	63,182	18 km
2017	LEGION LAKE	54,868	68 km
1985	FLINT HILLS	21,062	71 km
2024	WILDCAT CREEK	18,751	80 km
2003	RED POINT	18,057	27 km
1988	GALENA	16,936	64 km
2006	THORN DIVIDE COMPLEX	15,261	87 km
2002	BATTLE CREEK	15,034	68 km
1990	SWEDLUND	14,673	58 km
2016	INDIAN CANYON	13,791	75 km
2001	ELK MOUNTAIN 2	13,758	16 km
2001	ROGERS SHACK	11,794	35 km
2002	GRIZZLY GULCH	11,487	68 km
2001	WEST HELL CANYON	11,097	69 km
2007	ALABAUGH	10,650	74 km
2011	THOMPSON	10,519	85 km
2012	WHITE DRAW	9,297	59 km
1988	ROCHELLE HILLS 2	8,718	78 km
1985	SEVEN SISTERS	8,465	79 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	24°F (-4°C)	0.5 in	Driest
February	27°F (-3°C)	0.6 in
March	34°F (1°C)	0.8 in
April	43°F (6°C)	1.7 in
May	53°F (12°C)	2.7 in	Wettest
June	63°F (17°C)	2.7 in
July	73°F (23°C)	2.1 in	Warmest
August	69°F (21°C)	1.7 in
September	59°F (15°C)	1.3 in
October	46°F (8°C)	1.2 in
November	32°F (0°C)	0.7 in
December	24°F (-5°C)	0.6 in	Coldest

Newcastle has a seasonal temperature swing of 50°F / from 24°F in December to 73°F in July. Total annual precipitation is 16.6 inches, with May being the wettest month (2.7") and January the driest (0.5").

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