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Weather & Climate in Green River, WY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Green River has a cool climate with an average annual temperature of 44°F (7°C). Winters average 20°F in January while summers reach 70°F in July. The area gets 316 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 10.3 inches (drier than the 38-inch national average). The area receives 38.5 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 6,192 feet.
Temperature
20°F Jan (-7°C)
70°F Jul (21°C)
| Annual Average | 44.1°F |
| 18% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 316 days/yr |
Geography
| Elevation | 6,192 ft (1,887 m) |
| Area | 14.0 sq mi (36.3 km²) |
| Population Density | 846/sq mi |
| Coordinates | 41.5129°N, 109.4708°W |
| Timezone | America/Denver |
| County | Sweetwater County County |
| Nearest Airport | Southwest Wyoming Regional (RKS) 22 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 34.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 30.6 / 100 |
| Social Vulnerability | 19.3 / 100 |
| Community Resilience | 16.4 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Relatively Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | No Rating |
| Winter Weather | Relatively High |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Moderate |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
91 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.9.
| Apr 15, 2010 | 9 km NE of Randolph, Utah | M4.9 | 137 km | 10 km |
| Apr 6, 1999 | 31 km SE of Wamsutter, Wyoming | M4.3 | 144 km | 10 km |
| Jan 30, 2000 | 8 km ESE of Little America, Wyoming | M4.3 | 25 km | 5 km |
| Feb 25, 2007 | Wyoming | M3.8 | 146 km | -2 km |
| Oct 21, 1996 | 42 km ESE of Boulder, Wyoming | M3.7 | 116 km | 5 km |
| Nov 11, 2000 | 14 km SE of Jensen, Utah | M3.6 | 140 km | -3 km |
| Jun 30, 1998 | 8 km NNW of Point of Rocks, Wyoming | M3.6 | 60 km | 6 km |
| Jun 25, 1994 | 12 km NE of Little America, Wyoming | M3.6 | 25 km | -3 km |
| Jul 2, 2016 | 7 km NNE of Granger, Wyoming | M3.5 | 42 km | -3 km |
| Mar 7, 2009 | 9 km NNE of Granger, Wyoming | M3.5 | 41 km | 1 km |
| Feb 9, 2015 | 11 km NNE of Granger, Wyoming | M3.5 | 40 km | -2 km |
| Dec 10, 1999 | 11 km NE of Dinosaur, Colorado | M3.5 | 143 km | 8 km |
| Apr 23, 2025 | 2 km NNW of Little America, Wyoming | M3.5 | 33 km | -2 km |
| Aug 10, 2025 | 3 km NNW of Little America, Wyoming | M3.5 | 34 km | -2 km |
| Oct 15, 2013 | 14 km NNE of Granger, Wyoming | M3.4 | 43 km | -3 km |
| Jul 1, 2016 | 20 km NE of Granger, Wyoming | M3.4 | 39 km | 3 km |
| Jun 5, 2007 | 15 km NNW of Granger, Wyoming | M3.4 | 53 km | -3 km |
| Feb 9, 2008 | 9 km NE of Granger, Wyoming | M3.3 | 39 km | 5 km |
| May 18, 2005 | 7 km NW of Bear River, Wyoming | M3.3 | 136 km | -3 km |
| Feb 20, 2025 | 2 km N of Little America, Wyoming | M3.3 | 33 km | -3 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
24 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2.
| Date | Rating | Distance | Path | Fatalities |
| May 10, 1950 | EF2 | 88 km | 2.0 mi | 0 |
| Jul 10, 2001 | EF1 | 61 km | 5.0 mi | 0 |
| Apr 20, 2001 | EF1 | 8 km | 0.2 mi | 0 |
| Apr 14, 2000 | EF1 | 8 km | 0.5 mi | 0 |
| Jul 31, 1978 | EF1 | 27 km | 1.0 mi | 0 |
| Jun 27, 1974 | EF1 | 2 km | 0.1 mi | 0 |
| Sep 9, 1973 | EF1 | 11 km | 0.1 mi | 0 |
| May 28, 2018 | EF0 | 40 km | 3.5 mi | 0 |
| May 26, 2017 | EF0 | 88 km | 11.4 mi | 0 |
| Jun 16, 2015 | EF0 | 82 km | 1.0 mi | 0 |
| May 7, 2014 | EF0 | 44 km | 0.5 mi | 0 |
| Sep 15, 2013 | EF0 | 43 km | 0.1 mi | 0 |
| Aug 21, 2001 | EF0 | 71 km | 2.0 mi | 0 |
| May 5, 1999 | EF0 | 75 km | 1.0 mi | 0 |
| Jun 10, 1997 | EF0 | 17 km | 0.1 mi | 0 |
| May 15, 1992 | EF0 | 76 km | 0.1 mi | 0 |
| Sep 9, 1991 | EF0 | 73 km | 0.4 mi | 0 |
| Aug 4, 1990 | EF0 | 70 km | 0.1 mi | 0 |
| Jul 24, 1990 | EF0 | 72 km | 0.1 mi | 0 |
| May 30, 1989 | EF0 | 46 km | 0.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: WLD HORSE (41,881 acres, 2000).
| Year | Name | Acres Burned | Distance |
| 2000 | WLD HORSE | 41,881 | 28 km |
| 2000 | SHEEP MT | 31,393 | 35 km |
| 2002 | MUSTANG | 20,607 | 65 km |
| 2017 | PEEKABOO | 11,985 | 97 km |
| 2018 | LANEY RIM | 11,589 | 54 km |
| 2000 | BUSTERFLAT | 8,501 | 99 km |
| 2020 | RICHARD MTN | 7,802 | 60 km |
| 1997 | RED CREEK | 5,381 | 65 km |
| 1985 | WEYMAN | 5,058 | 78 km |
| 2006 | SALT WELLS BASIN | 4,581 | 53 km |
| 2005 | SHEEP CREEK WFU | 4,128 | 80 km |
| 2018 | BENDER MOUNTAIN | 3,797 | 70 km |
| 2021 | WEST | 3,588 | 73 km |
| 2018 | BLACK BUTTE | 3,124 | 57 km |
| 2007 | MARSHALL PHASE II | 2,834 | 88 km |
| 2004 | MAIL DRAW | 2,601 | 85 km |
| 1986 | BIG JOE | 2,536 | 94 km |
| 2015 | BITTER CREEK | 2,372 | 36 km |
| 2000 | SAGE CREEK 3 | 2,228 | 57 km |
| 1994 | SUBSTATION | 2,018 | 50 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 0.5 in | |
| February | 21°F (-6°C) | 0.4 in | Driest |
| March | 31°F (-1°C) | 0.6 in | |
| April | 39°F (4°C) | 0.8 in | |
| May | 48°F (9°C) | 1.1 in | Wettest |
| June | 58°F (14°C) | 0.9 in | |
| July | 70°F (21°C) | 0.8 in | Warmest |
| August | 64°F (18°C) | 0.8 in | |
| September | 54°F (12°C) | 0.8 in | |
| October | 43°F (6°C) | 0.7 in | |
| November | 28°F (-2°C) | 0.5 in | |
| December | 19°F (-7°C) | 0.5 in | Coldest |
Green River has a seasonal temperature swing of 51°F / from 19°F in December to 70°F in July. Total annual precipitation is 8.4 inches, with May being the wettest month (1.1") and February the driest (0.4").