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Weather & Climate in Dayton, WY

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

Dayton has a cool climate with an average annual temperature of 44°F (7°C). Winters average 23°F in January while summers reach 68°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 18.0 inches (drier than the 38-inch national average). The area receives 68.3 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 34. The city sits at an elevation of 3,939 feet.

Temperature

23°F Jan (-5°C) 68°F Jul (20°C)
Annual Average43.9°F
19% below US avg
January Average23°F (-5°C)
July Average68°F (20°C)
Sunny Days311 days/yr

Geography

Elevation3,939 ft (1,201 m)
Area0.5 sq mi (1.4 km²)
Population Density1,740/sq mi
Coordinates44.8734°N, 107.2624°W
TimezoneAmerica/Denver
CountyBig Horn County County
Nearest AirportSheridan County (SHR)
16 miles away

Precipitation & Snow

Annual Rainfall 18.0"
53% below US avg
Snowfall 68.3"
Wettest Month (May) 2.52"
Driest Month (Feb) 0.67"

Air Quality

AQI Median34.0
RatingGood

Natural Hazard Risk

Overall RiskVery Low
Risk Score31.1 / 100
Social Vulnerability52.6 / 100
Community Resilience7.7 / 100

Hazard Breakdown

Tornado Very Low
Earthquake Relatively Low
Wildfire Very Low
Flood Relatively Low
Hail Very Low
Strong Wind Very Low
Heat Wave Very Low
Winter Weather Relatively Low
Lightning Relatively Low
Ice Storm Very Low
Drought Relatively Low
Cold Wave Relatively Low
Landslide Relatively High
Volcano Very Low
Avalanche Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

35 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.0.

Aug 22, 2009 20 km SSE of Birney, Montana M4.0 70 km 14 km
Apr 13, 2021 51 km S of Ten Sleep, Wyoming M3.9 145 km 12 km
Feb 25, 1993 31 km N of Arvada, Wyoming M3.9 95 km 5 km
Feb 13, 2023 Wyoming M3.7 148 km 10 km
Dec 23, 1991 10 km SW of Colstrip, Montana M3.6 114 km 5 km
Aug 31, 1992 34 km WNW of Kaycee, Wyoming M3.6 118 km 5 km
Jul 4, 2021 43 km S of Ten Sleep, Wyoming M3.6 137 km 17 km
Nov 16, 1993 17 km SSE of Ten Sleep, Wyoming M3.5 110 km 5 km
Sep 3, 2023 32 km NW of Kaycee, Wyoming M3.3 110 km 5 km
Apr 5, 2002 7 km W of South Flat, Wyoming M3.3 123 km 5 km
Jul 21, 2023 Eastern Montana M3.2 143 km 5 km
Oct 25, 2009 34 km S of Buffalo, Wyoming M3.0 105 km 5 km
Sep 27, 2016 43 km WSW of Gillette, Wyoming M3.0 127 km 14 km
Feb 13, 1998 12 km NE of Hyattville, Wyoming M3.0 63 km 5 km
Mar 2, 2014 9 km SE of Washakie Ten, Wyoming M2.9 103 km 0 km
Feb 22, 1992 30 km E of Buffalo, Wyoming M2.9 97 km 5 km
May 25, 2018 45 km W of Biddle, Montana M2.9 108 km 16 km
Mar 23, 2023 8 km S of Shell, Wyoming M2.8 61 km 11 km
Jan 15, 2023 6 km NE of Ashland, Montana M2.8 118 km 11 km
Mar 30, 2018 20 km NNE of Sheridan, Wyoming M2.8 35 km 5 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

59 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 1 fatality, 5 injuries.

Date Rating Distance Path Fatalities
Aug 2, 1985 EF3 54 km 0.2 mi 0
Jun 1, 2018 EF2 95 km 1.0 mi 0
Jun 1, 2018 EF2 98 km 1.0 mi 0
Jul 4, 1978 EF2 72 km 5.0 mi 0
Jul 24, 1967 EF2 91 km 0.1 mi 0
Jul 9, 1962 EF2 95 km 0.5 mi 0
Jun 12, 1962 EF2 100 km 0.5 mi 0
Jun 26, 1959 EF2 47 km 9.2 mi 1
Jun 3, 1958 EF2 56 km 0.2 mi 0
Jun 19, 2019 EF1 81 km 4.1 mi 0
Jun 7, 2018 EF1 86 km 0.8 mi 0
Jun 21, 2010 EF1 92 km 1.0 mi 0
Jun 1, 2009 EF1 82 km 0.4 mi 0
Jun 26, 2001 EF1 76 km 0.7 mi 0
Jun 6, 1997 EF1 71 km 1.0 mi 0
Jul 9, 1991 EF1 99 km 0.1 mi 0
Jun 21, 1984 EF1 50 km 1.0 mi 0
Jun 21, 1984 EF1 39 km 2.0 mi 0
Jun 15, 1984 EF1 9 km 1.0 mi 0
Jul 24, 1981 EF1 88 km 0.1 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: REMINGTON (192,577 acres, 2024).

Year Name Acres Burned Distance
2024 REMINGTON 192,577 85 km
2017 DEER CREEK 90,147 63 km
2012 SARPY HILLS COMPLEX 83,942 86 km
2000 STAG 62,381 98 km
1994 BABY DEAN 61,955 80 km
2020 SARPY 51,619 90 km
2018 TEREK 43,872 90 km
2006 BUFFALO CREEK 37,630 74 km
2017 WITTEN 27,938 73 km
2003 LITTLEHAWK 27,926 89 km
2012 CATO 26,816 76 km
2020 WADDLE CREEK 25,809 60 km
2011 BLACK SPRINGS COMPLEX 19,473 93 km
2024 MCGHEE 19,161 70 km
1988 KIRBY 14,253 64 km
1994 BARREL SPR 13,526 67 km
1988 LOST 13,081 65 km
2007 BONE CREEK 12,776 41 km
1991 HORSLEY 11,829 73 km
2007 POWDER RIVER COMPLEX 11,716 92 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 23°F (-5°C) 0.8 in Coldest
February 26°F (-3°C) 0.7 in Driest
March 34°F (1°C) 1.1 in
April 43°F (6°C) 1.9 in
May 52°F (11°C) 2.5 in Wettest
June 62°F (17°C) 2.4 in
July 68°F (20°C) 1.1 in Warmest
August 68°F (20°C) 0.9 in
September 57°F (14°C) 1.6 in
October 46°F (8°C) 1.4 in
November 32°F (0°C) 0.9 in
December 23°F (-5°C) 0.8 in

Dayton has a seasonal temperature swing of 45°F / from 23°F in January to 68°F in July. Total annual precipitation is 16.0 inches, with May being the wettest month (2.5") and February the driest (0.7").

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