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Weather & Climate in Ralston, WY

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

Ralston experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 23°F in January while summers reach 70°F in July. The area gets 293 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 9.3 inches (drier than the 38-inch national average). The area receives 44.2 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 4,571 feet.

Temperature

23°F Jan (-5°C) 70°F Jul (21°C)
Annual Average45.6°F
16% below US avg
January Average23°F (-5°C)
July Average70°F (21°C)
Sunny Days293 days/yr

Geography

Elevation4,571 ft (1,393 m)
Area5.7 sq mi (14.6 km²)
Population Density23/sq mi
Coordinates44.7069°N, 108.8854°W
TimezoneAmerica/Denver
CountyCarbon County County
Nearest AirportYellowstone Regional (COD)
15 miles away

Precipitation & Snow

Annual Rainfall 9.3"
76% below US avg
Snowfall 44.2"
Wettest Month (May) 1.73"
Driest Month (Feb) 0.24"

Air Quality

AQI Median34.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively Low
Risk Score59.8 / 100
Social Vulnerability74.8 / 100
Community Resilience64.1 / 100

Hazard Breakdown

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

Earthquake History

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

Mar 30, 2014 22 km S of Mammoth, Wyoming M4.8 142 km 6 km
Aug 21, 2003 53 km N of Kelly, Wyoming M4.3 146 km 6 km
May 11, 2022 36 km S of Silver Gate, Montana M4.2 88 km 14 km
Nov 24, 2000 24 km S of Mammoth, Wyoming M4.2 143 km 9 km
Aug 28, 1995 62 km NNE of Kelly, Wyoming M4.2 130 km 8 km
Mar 25, 2008 35 km S of Silver Gate, Montana M4.2 89 km 4 km
May 18, 2006 69 km NNE of Kelly, Wyoming M3.8 123 km 7 km
Nov 26, 1998 63 km SE of West Yellowstone, Montana M3.8 135 km 6 km
Jan 29, 2025 24 km SSW of Mammoth, Wyoming M3.7 149 km 8 km
Mar 29, 2023 56 km SSE of Mammoth, Wyoming M3.7 119 km 4 km
Sep 24, 1994 39 km SSE of Mammoth, Wyoming M3.7 126 km 5 km
Mar 30, 2014 21 km S of Mammoth, Wyoming M3.7 145 km 3 km
Jul 17, 2021 63 km SSE of Mammoth, Wyoming M3.6 119 km 6 km
Jul 20, 1992 52 km SSE of Mammoth, Wyoming M3.6 117 km 0 km
Mar 30, 2014 Wyoming M3.6 143 km 4 km
Mar 26, 2014 20 km SSW of Mammoth, Wyoming M3.5 150 km 5 km
Jul 20, 1992 51 km SSE of Mammoth, Wyoming M3.5 118 km 2 km
Aug 15, 2019 59 km NNE of Kelly, Wyoming M3.5 135 km 7 km
Jun 4, 2014 21 km SSW of Mammoth, Wyoming M3.5 149 km 8 km
Nov 24, 2000 25 km S of Mammoth, Wyoming M3.5 143 km 8 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: 1 injury.

Date Rating Distance Path Fatalities
Aug 2, 1985 EF3 75 km 0.2 mi 0
Jun 16, 2010 EF2 55 km 1.0 mi 0
Jul 11, 1978 EF2 6 km 0.4 mi 0
Jul 4, 1978 EF2 74 km 5.0 mi 0
Jul 24, 1967 EF2 68 km 0.1 mi 0
Jun 26, 1964 EF2 12 km 1.0 mi 0
Jul 9, 1962 EF2 64 km 0.5 mi 0
Jun 12, 1962 EF2 46 km 0.5 mi 0
Jun 3, 1958 EF2 90 km 0.2 mi 0
Jun 1, 2009 EF1 100 km 0.4 mi 0
Jun 26, 2001 EF1 71 km 0.7 mi 0
Jun 6, 1997 EF1 68 km 1.0 mi 0
May 18, 1991 EF1 6 km 0.2 mi 0
May 24, 1990 EF1 46 km 0.2 mi 0
Aug 25, 1986 EF1 22 km 1.0 mi 0
Jul 24, 1981 EF1 42 km 0.1 mi 0
Jun 18, 1978 EF1 52 km 0.1 mi 0
Jul 4, 1976 EF1 77 km 0.2 mi 0
Jun 26, 1976 EF1 14 km 2.0 mi 0
Jul 20, 1974 EF1 97 km 0.1 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Nearby Volcanoes

1 volcano within 200 km. Closest: Yellowstone (145 km).

Name Type Elevation Last Eruption Distance
Yellowstone Caldera(s) 2,805 m (9,203 ft) -1350 145 km
Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: CLOVERMIST (303,427 acres, 1988).

Year Name Acres Burned Distance
1988 CLOVERMIST 303,427 81 km
2008 GUNBARREL 69,730 50 km
1988 CLOVER 34,035 91 km
2006 LITTLE VENUS 33,490 82 km
2021 ROBERTSON DRAW 31,132 48 km
1996 SHEPARD MTN 17,379 80 km
2007 BONE CREEK 12,776 98 km
2016 WHIT 12,731 50 km
2019 FISHHAWK 10,775 85 km
2003 BOULDER BASIN II 10,029 81 km
2008 CASCADE 10,017 68 km
1999 ROOSTER 9,624 76 km
2021 CRATER RIDGE 8,147 93 km
2011 HOLE IN THE WALL 6,559 48 km
2003 LITTLE HORN II 5,889 99 km
2003 DEEP LAKE 5,466 42 km
2003 NORRIS 5,284 89 km
2002 COW CREEK 5,162 96 km
2002 RED WAFFLE 5,060 57 km
2005 BIG HORN 4,899 79 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 23°F (-5°C) 0.4 in Coldest
February 28°F (-2°C) 0.2 in Driest
March 36°F (2°C) 0.5 in
April 44°F (7°C) 0.8 in
May 53°F (12°C) 1.7 in Wettest
June 62°F (17°C) 1.5 in
July 70°F (21°C) 1.0 in Warmest
August 67°F (20°C) 0.7 in
September 57°F (14°C) 1.0 in
October 46°F (8°C) 0.8 in
November 32°F (-0°C) 0.4 in
December 23°F (-5°C) 0.3 in

Ralston has a seasonal temperature swing of 46°F / from 23°F in January to 70°F in July. Total annual precipitation is 9.3 inches, with May being the wettest month (1.7") and February the driest (0.2").

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