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Weather & Climate in Riverton, WY

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

Riverton has a cool climate with an average annual temperature of 44°F (7°C). Winters average 16°F in January while summers reach 71°F in July. The area gets 310 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 9.5 inches (drier than the 38-inch national average). The area receives 44.3 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 4,957 feet.

Temperature

16°F Jan (-9°C) 71°F Jul (22°C)
Annual Average43.9°F
19% below US avg
January Average16°F (-9°C)
July Average71°F (22°C)
Sunny Days310 days/yr

Geography

Elevation4,957 ft (1,511 m)
Area9.9 sq mi (25.5 km²)
Population Density1,043/sq mi
Coordinates43.0263°N, 108.3813°W
TimezoneAmerica/Denver
CountyFremont County County
Nearest AirportCentral Wyoming Regional (RIW)
5 miles away

Precipitation & Snow

Annual Rainfall 9.5"
75% below US avg
Snowfall 44.3"
Wettest Month (May) 1.77"
Driest Month (Jan) 0.24"

Air Quality

AQI Median34.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively Low
Risk Score59.7 / 100
Social Vulnerability52.8 / 100
Community Resilience11.8 / 100

Hazard Breakdown

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

Earthquake History

67 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.8.

Sep 21, 2013 20 km W of Fort Washakie, Wyoming M4.8 61 km 76 km
Sep 27, 2001 35 km WSW of Dubois, Wyoming M4.3 144 km 5 km
Oct 10, 1992 25 km SSE of Riverton, Wyoming M4.0 26 km 5 km
May 26, 2000 5 km S of Bairoil, Wyoming M4.0 114 km 5 km
Nov 3, 2017 57 km S of Ten Sleep, Wyoming M4.0 97 km 17 km
Apr 13, 2021 51 km S of Ten Sleep, Wyoming M3.9 102 km 12 km
Jun 1, 1993 6 km N of Bairoil, Wyoming M3.7 104 km 5 km
Oct 21, 1996 42 km ESE of Boulder, Wyoming M3.7 90 km 5 km
May 17, 2009 24 km WNW of Jeffrey City, Wyoming M3.7 58 km 5 km
Feb 13, 2023 Wyoming M3.7 98 km 10 km
Aug 31, 1992 34 km WNW of Kaycee, Wyoming M3.6 140 km 5 km
Jul 4, 2021 43 km S of Ten Sleep, Wyoming M3.6 107 km 17 km
Jun 30, 1998 8 km NNW of Point of Rocks, Wyoming M3.6 147 km 6 km
Nov 16, 1993 17 km SSE of Ten Sleep, Wyoming M3.5 125 km 5 km
Aug 7, 1991 31 km NNW of Pavillion, Wyoming M3.5 66 km 5 km
Jan 9, 2007 7 km ENE of East Thermopolis, Wyoming M3.5 75 km 5 km
Aug 13, 2004 35 km SW of Alcova, Wyoming M3.5 142 km 5 km
Oct 8, 2009 31 km SSW of Alcova, Wyoming M3.4 147 km 5 km
Aug 26, 2022 27 km E of Bairoil, Wyoming M3.3 129 km 5 km
Apr 5, 2002 7 km W of South Flat, Wyoming M3.3 105 km 5 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

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

Date Rating Distance Path Fatalities
Jun 16, 1962 EF3 31 km 0.5 mi 0
Jul 10, 2001 EF2 90 km 0.5 mi 0
Jun 7, 1986 EF2 30 km 2.0 mi 0
Aug 27, 1973 EF2 63 km 0.5 mi 0
Jun 6, 1967 EF2 9 km 8.2 mi 0
May 6, 2014 EF1 30 km 1.5 mi 0
Jun 6, 1997 EF1 7 km 2.0 mi 0
Aug 3, 1980 EF1 31 km 0.1 mi 0
Aug 3, 1976 EF1 42 km 0.1 mi 0
Jun 6, 1968 EF1 12 km 3.0 mi 0
Jun 5, 1968 EF1 3 km 0.1 mi 0
Jun 14, 1967 EF1 9 km 0.5 mi 0
Apr 23, 1964 EF1 32 km 0.5 mi 0
Sep 9, 2024 EF0 70 km 0.2 mi 0
Aug 11, 2020 EF0 17 km 0.2 mi 0
May 28, 2018 EF0 82 km 0.5 mi 0
Jun 3, 2014 EF0 91 km 2.2 mi 0
May 6, 2014 EF0 22 km 4.8 mi 0
Jun 14, 2009 EF0 77 km 0.7 mi 0
Jun 3, 2009 EF0 87 km 0.9 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: KATESBASIN (141,128 acres, 2000).

Year Name Acres Burned Distance
2000 KATESBASIN 141,128 59 km
1996 EBLACK MTN 53,211 93 km
1996 BATES 47,060 97 km
2012 ALPINE LAKE 39,158 75 km
1988 FAYETTE 29,234 99 km
2020 NEIBER 17,594 95 km
2002 SOUTH FORK II 13,803 56 km
2002 PASS CREEK 13,724 52 km
2018 DENVER JAKE 6,973 97 km
1985 GOAT MTN 6,450 96 km
2000 MUDDYCRK 4,601 66 km
2007 COPPER MTN. 4,458 59 km
2018 ZIMMERMAN 3,655 88 km
1989 ANNS 3,298 74 km
2002 DIVIDE 2,831 89 km
2023 BLACK MOUNTAIN 2,596 90 km
2018 POTTER BUTTE 2,444 92 km
2022 WASHAKIE PARK 2,337 60 km
1988 WISE FLAT 2,232 50 km
2018 BLACK MOUNTAIN 2,178 81 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 16°F (-9°C) 0.2 in Coldest, Driest
February 24°F (-4°C) 0.2 in
March 36°F (2°C) 0.5 in
April 45°F (7°C) 1.1 in
May 54°F (12°C) 1.8 in Wettest
June 64°F (18°C) 1.1 in
July 71°F (22°C) 0.8 in Warmest
August 69°F (21°C) 0.6 in
September 58°F (14°C) 0.9 in
October 46°F (8°C) 0.8 in
November 30°F (-1°C) 0.4 in
December 19°F (-7°C) 0.3 in

Riverton has a seasonal temperature swing of 55°F / from 16°F in January to 71°F in July. Total annual precipitation is 8.6 inches, with May being the wettest month (1.8") and January the driest (0.2").

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