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Weather & Climate in Greybull, WY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Greybull has a cool climate with an average annual temperature of 45°F (7°C). Winters average 16°F in January while summers reach 73°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 7.2 inches (drier than the 38-inch national average). The area receives 19.2 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 3,794 feet.
Temperature
16°F Jan (-9°C)
73°F Jul (23°C)
| Annual Average | 45.0°F |
| 17% below US avg | |
| January Average | 16°F (-9°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 3,794 ft (1,156 m) |
| Area | 1.8 sq mi (4.7 km²) |
| Population Density | 933/sq mi |
| Coordinates | 44.4865°N, 108.0557°W |
| Timezone | America/Denver |
| County | Big Horn County County |
| Nearest Airport | Worland Municipal (WRL) 37 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 34.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 31.1 / 100 |
| Social Vulnerability | 52.6 / 100 |
| Community Resilience | 7.7 / 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
40 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.0.
| Nov 3, 2017 | 57 km S of Ten Sleep, Wyoming | M4.0 | 120 km | 17 km |
| Aug 22, 2009 | 20 km SSE of Birney, Montana | M4.0 | 146 km | 14 km |
| Apr 13, 2021 | 51 km S of Ten Sleep, Wyoming | M3.9 | 116 km | 12 km |
| Feb 13, 2023 | Wyoming | M3.7 | 117 km | 10 km |
| Jul 4, 2021 | 43 km S of Ten Sleep, Wyoming | M3.6 | 108 km | 17 km |
| Aug 31, 1992 | 34 km WNW of Kaycee, Wyoming | M3.6 | 109 km | 5 km |
| Aug 7, 1991 | 31 km NNW of Pavillion, Wyoming | M3.5 | 127 km | 5 km |
| Nov 16, 1993 | 17 km SSE of Ten Sleep, Wyoming | M3.5 | 86 km | 5 km |
| Jan 9, 2007 | 7 km ENE of East Thermopolis, Wyoming | M3.5 | 91 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 | 61 km | 5 km |
| Jul 21, 2023 | Eastern Montana | M3.2 | 129 km | 5 km |
| Oct 31, 2017 | 56 km S of Ten Sleep, Wyoming | M3.2 | 118 km | 15 km |
| Dec 16, 2012 | 40 km W of Owl Creek, Wyoming | M3.1 | 112 km | 5 km |
| Nov 9, 1999 | 58 km ENE of Shoshoni, Wyoming | M3.1 | 121 km | 5 km |
| Jan 6, 2017 | 22 km SW of Owl Creek, Wyoming | M3.0 | 109 km | 13 km |
| Oct 25, 2009 | 34 km S of Buffalo, Wyoming | M3.0 | 122 km | 5 km |
| Nov 8, 2000 | 40 km ENE of Shoshoni, Wyoming | M3.0 | 120 km | 5 km |
| Feb 13, 1998 | 12 km NE of Hyattville, Wyoming | M3.0 | 46 km | 5 km |
| Feb 22, 1992 | 30 km E of Buffalo, Wyoming | M2.9 | 139 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
66 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 1 fatality, 2 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Aug 2, 1985 | EF3 | 39 km | 0.2 mi | 0 |
| Jun 1, 2018 | EF2 | 91 km | 1.0 mi | 0 |
| Jun 1, 2018 | EF2 | 90 km | 1.0 mi | 0 |
| Jun 16, 2010 | EF2 | 92 km | 1.0 mi | 0 |
| Jul 10, 2001 | EF2 | 74 km | 0.5 mi | 0 |
| Jul 11, 1978 | EF2 | 65 km | 0.4 mi | 0 |
| Jul 4, 1978 | EF2 | 5 km | 5.0 mi | 0 |
| Jul 24, 1967 | EF2 | 16 km | 0.1 mi | 0 |
| Jun 26, 1964 | EF2 | 62 km | 1.0 mi | 0 |
| Jul 9, 1962 | EF2 | 19 km | 0.5 mi | 0 |
| Jun 12, 1962 | EF2 | 27 km | 0.5 mi | 0 |
| Jun 26, 1959 | EF2 | 40 km | 9.2 mi | 1 |
| Jun 3, 1958 | EF2 | 22 km | 0.2 mi | 0 |
| Jun 19, 2019 | EF1 | 85 km | 4.1 mi | 0 |
| Aug 30, 2010 | EF1 | 72 km | 4.6 mi | 0 |
| Jun 1, 2009 | EF1 | 33 km | 0.4 mi | 0 |
| Jun 26, 2001 | EF1 | 1 km | 0.7 mi | 0 |
| Jun 6, 1997 | EF1 | 9 km | 1.0 mi | 0 |
| May 18, 1991 | EF1 | 74 km | 0.2 mi | 0 |
| May 24, 1990 | EF1 | 86 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: EBLACK MTN (53,211 acres, 1996).
| Year | Name | Acres Burned | Distance |
| 1996 | EBLACK MTN | 53,211 | 82 km |
| 2018 | TEREK | 43,872 | 41 km |
| 2020 | NEIBER | 17,594 | 78 km |
| 1988 | LOST | 13,081 | 85 km |
| 2007 | BONE CREEK | 12,776 | 36 km |
| 1999 | ROOSTER | 9,624 | 85 km |
| 2021 | CRATER RIDGE | 8,147 | 57 km |
| 1996 | WILLOW | 7,723 | 97 km |
| 2001 | THUNDER CH | 7,539 | 95 km |
| 1996 | BUFFALO 2 | 7,173 | 82 km |
| 2018 | DENVER JAKE | 6,973 | 81 km |
| 2003 | LITTLE HORN II | 5,889 | 62 km |
| 2006 | OWL | 5,541 | 97 km |
| 2012 | GILEAD | 5,374 | 89 km |
| 2002 | RED WAFFLE | 5,060 | 75 km |
| 1996 | NBROKENBAC | 4,921 | 61 km |
| 2005 | BIG HORN | 4,899 | 74 km |
| 2012 | OTTER CREEK-UPPER BEE | 4,786 | 94 km |
| 2007 | LITTLE GOOSE | 4,767 | 80 km |
| 2000 | MUDDYCRK | 4,601 | 100 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 16°F (-9°C) | 0.3 in | Coldest |
| February | 25°F (-4°C) | 0.2 in | Driest |
| March | 37°F (3°C) | 0.4 in | |
| April | 46°F (8°C) | 0.8 in | |
| May | 56°F (13°C) | 1.3 in | Wettest |
| June | 66°F (19°C) | 1.1 in | |
| July | 73°F (23°C) | 0.6 in | Warmest |
| August | 71°F (22°C) | 0.5 in | |
| September | 59°F (15°C) | 0.9 in | |
| October | 46°F (8°C) | 0.7 in | |
| November | 31°F (-1°C) | 0.4 in | |
| December | 20°F (-7°C) | 0.3 in |
Greybull has a seasonal temperature swing of 57°F / from 16°F in January to 73°F in July. Total annual precipitation is 7.5 inches, with May being the wettest month (1.3") and February the driest (0.2").