Weather & Climate in Osage, WY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Osage has a cool climate with an average annual temperature of 45°F (7°C). Winters average 21°F in January while summers reach 72°F in July. Annual precipitation totals 16.2 inches (drier than the 38-inch national average). The area receives 46.4 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 39. 88% of days have good air quality. The city sits at an elevation of 4,265 feet.
Temperature
21°F Jan (-6°C)
72°F Jul (22°C)
| Annual Average | 44.8°F |
| 17% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 72°F (22°C) |
Geography
| Elevation | 4,265 ft (1,300 m) |
| Area | 1.9 sq mi (5.0 km²) |
| Population Density | 47/sq mi |
| Coordinates | 43.9848°N, 104.4346°W |
| Timezone | America/Denver |
| County | Weston County County |
| Nearest Airport | Northeast Wyoming Regional (GCC) 60 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
| Good Days % | 87.7% |
| Unhealthy Days | 5 |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 7.9 / 100 |
| Social Vulnerability | 21.3 / 100 |
| Community Resilience | 3.3 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Very Low |
| Hail | Relatively Moderate |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
28 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.2.
| Sep 25, 2009 | 15 km E of Alzada, Montana | M4.2 | 117 km | 5 km |
| Aug 29, 2004 | 16 km NNW of Douglas, Wyoming | M3.8 | 149 km | 5 km |
| Feb 6, 1996 | 13 km WNW of Hill City, South Dakota | M3.7 | 57 km | 5 km |
| Apr 9, 1996 | 34 km SW of Edgemont, South Dakota | M3.7 | 105 km | 5 km |
| Mar 9, 2025 | 7 km W of Fairburn, South Dakota | M3.6 | 97 km | 5 km |
| Dec 12, 2013 | 10 km WSW of Hermosa, South Dakota | M3.5 | 91 km | 5 km |
| Feb 15, 2004 | 19 km N of Douglas, Wyoming | M3.5 | 140 km | 10 km |
| Mar 26, 2021 | 10 km E of Edgemont, South Dakota | M3.4 | 96 km | 5 km |
| May 10, 2013 | 25 km NW of Wright, Wyoming | M3.1 | 102 km | 9 km |
| Feb 7, 2007 | 11 km WSW of Wasta, South Dakota | M3.1 | 148 km | 5 km |
| May 3, 1996 | 32 km SSW of Edgemont, South Dakota | M3.1 | 110 km | 5 km |
| Jun 30, 1993 | 25 km N of Douglas, Wyoming | M3.0 | 135 km | 5 km |
| Nov 2, 1992 | 5 km ESE of Lusk, Wyoming | M3.0 | 139 km | 5 km |
| Jun 29, 2024 | 22 km ESE of Hill View Heights, Wyoming | M3.0 | 50 km | 10 km |
| Jan 16, 2012 | 25 km E of Buffalo Gap, South Dakota | M3.0 | 128 km | 5 km |
| Sep 27, 2016 | 43 km WSW of Gillette, Wyoming | M3.0 | 128 km | 14 km |
| Mar 10, 2011 | 22 km N of Van Tassell, Wyoming | M2.9 | 128 km | 5 km |
| Jun 16, 2024 | 7 km NNE of Buffalo Gap, South Dakota | M2.9 | 106 km | 8 km |
| Jan 5, 2004 | 28 km SSE of Hill View Heights, Wyoming | M2.8 | 56 km | 5 km |
| Sep 4, 2023 | 50 km WSW of Antelope Valley-Crestview, Wyoming | M2.8 | 130 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
201 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 2 fatalities, 74 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 29, 1993 | EF3 | 53 km | 3.0 mi | 0 |
| May 11, 1991 | EF3 | 100 km | 2.0 mi | 0 |
| Jun 25, 1975 | EF3 | 28 km | 11.5 mi | 0 |
| Jul 18, 1965 | EF3 | 98 km | 0.1 mi | 0 |
| Jul 12, 1965 | EF3 | 33 km | 20.8 mi | 0 |
| Jun 23, 2023 | EF2 | 92 km | 3.8 mi | 0 |
| Jul 6, 2020 | EF2 | 45 km | 5.1 mi | 0 |
| Jul 6, 2020 | EF2 | 44 km | 2.1 mi | 0 |
| Jun 13, 2016 | EF2 | 96 km | 7.4 mi | 0 |
| Jun 13, 2014 | EF2 | 82 km | 16.5 mi | 0 |
| Jul 13, 2009 | EF2 | 67 km | 9.4 mi | 0 |
| Aug 12, 2005 | EF2 | 88 km | 1.5 mi | 2 |
| Jul 12, 1993 | EF2 | 84 km | 2.0 mi | 0 |
| May 11, 1991 | EF2 | 99 km | 1.0 mi | 0 |
| May 6, 1988 | EF2 | 76 km | 1.5 mi | 0 |
| May 10, 1985 | EF2 | 21 km | 1.0 mi | 0 |
| May 31, 1984 | EF2 | 54 km | 0.5 mi | 0 |
| Jun 25, 1975 | EF2 | 92 km | 16.3 mi | 0 |
| Jun 28, 1972 | EF2 | 85 km | 0.1 mi | 0 |
| Jul 23, 1969 | EF2 | 70 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: JASPER (82,298 acres, 2000).
| Year | Name | Acres Burned | Distance |
| 2000 | JASPER | 82,298 | 48 km |
| 2012 | OIL CREEK | 63,182 | 11 km |
| 2017 | LEGION LAKE | 54,868 | 91 km |
| 1999 | CLARKELEN | 21,432 | 93 km |
| 1985 | FLINT HILLS | 21,062 | 94 km |
| 2024 | WILDCAT CREEK | 18,751 | 72 km |
| 2003 | RED POINT | 18,057 | 50 km |
| 1988 | GALENA | 16,936 | 86 km |
| 2006 | THORN DIVIDE COMPLEX | 15,261 | 64 km |
| 2002 | BATTLE CREEK | 15,034 | 87 km |
| 1990 | SWEDLUND | 14,673 | 81 km |
| 2016 | INDIAN CANYON | 13,791 | 98 km |
| 2001 | ELK MOUNTAIN 2 | 13,758 | 40 km |
| 2001 | ROGERS SHACK | 11,794 | 59 km |
| 2002 | GRIZZLY GULCH | 11,487 | 71 km |
| 2001 | WEST HELL CANYON | 11,097 | 92 km |
| 2007 | ALABAUGH | 10,650 | 98 km |
| 2011 | THOMPSON | 10,519 | 88 km |
| 2012 | WHITE DRAW | 9,297 | 82 km |
| 1988 | ROCHELLE HILLS 2 | 8,718 | 69 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 21°F (-6°C) | 0.5 in | Coldest, Driest |
| February | 23°F (-5°C) | 0.5 in | |
| March | 35°F (1°C) | 0.8 in | |
| April | 43°F (6°C) | 1.8 in | |
| May | 53°F (11°C) | 2.8 in | Wettest |
| June | 63°F (17°C) | 2.6 in | |
| July | 72°F (22°C) | 2.1 in | Warmest |
| August | 70°F (21°C) | 1.4 in | |
| September | 60°F (15°C) | 1.2 in | |
| October | 45°F (7°C) | 1.5 in | |
| November | 32°F (-0°C) | 0.6 in | |
| December | 22°F (-6°C) | 0.5 in |
Osage has a seasonal temperature swing of 51°F / from 21°F in January to 72°F in July. Total annual precipitation is 16.2 inches, with May being the wettest month (2.8") and January the driest (0.5").