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Weather & Climate in Hanna, WY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hanna has a cool climate with an average annual temperature of 41°F (5°C). Winters average 20°F in January while summers reach 65°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 13.4 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 34. The city sits at an elevation of 6,808 feet.
Temperature
20°F Jan (-7°C)
65°F Jul (18°C)
| Annual Average | 40.9°F |
| 24% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 65°F (18°C) |
| Sunny Days | 316 days/yr |
Geography
| Elevation | 6,808 ft (2,075 m) |
| Area | 2.0 sq mi (5.3 km²) |
| Population Density | 409/sq mi |
| Coordinates | 41.8698°N, 106.5596°W |
| Timezone | America/Denver |
| County | Carbon County County |
| Nearest Airport | Laramie Regional (LAR) 59 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 34.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 42.7 / 100 |
| Social Vulnerability | 47.8 / 100 |
| Community Resilience | 25.6 / 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 Moderate |
| Lightning | Relatively High |
| Ice Storm | Relatively Low |
| Drought | Very Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Moderate |
| Avalanche | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
52 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.3.
| Apr 6, 1999 | 31 km SE of Wamsutter, Wyoming | M4.3 | 109 km | 10 km |
| Oct 19, 1996 | 21 km E of Antelope Hills, Wyoming | M4.2 | 142 km | 5 km |
| May 26, 2000 | 5 km S of Bairoil, Wyoming | M4.0 | 91 km | 5 km |
| Aug 29, 2004 | 16 km NNW of Douglas, Wyoming | M3.8 | 143 km | 5 km |
| Aug 2, 2021 | 12 km NW of Rolling Hills, Wyoming | M3.8 | 135 km | 10 km |
| Mar 19, 2022 | 5 km NW of Ryan Park, Wyoming | M3.8 | 58 km | 11 km |
| Feb 1, 2003 | 11 km E of Antelope Hills, Wyoming | M3.7 | 138 km | 5 km |
| Jun 1, 1993 | 6 km N of Bairoil, Wyoming | M3.7 | 97 km | 5 km |
| Jul 23, 1993 | 29 km WNW of Esterbrook, Wyoming | M3.7 | 98 km | 5 km |
| Oct 10, 1993 | 41 km W of Esterbrook, Wyoming | M3.7 | 84 km | 5 km |
| May 17, 2009 | 24 km WNW of Jeffrey City, Wyoming | M3.7 | 148 km | 5 km |
| Jun 2, 2023 | 9 km SSE of Saratoga, Wyoming | M3.6 | 57 km | 1 km |
| Aug 6, 1998 | 18 km NNE of Rawlins, Wyoming | M3.6 | 53 km | 10 km |
| Aug 13, 2004 | 35 km SW of Alcova, Wyoming | M3.5 | 57 km | 5 km |
| Oct 8, 2009 | 31 km SSW of Alcova, Wyoming | M3.4 | 55 km | 5 km |
| Sep 14, 2024 | 9 km SSE of Saratoga, Wyoming | M3.4 | 56 km | 10 km |
| Aug 26, 2022 | 27 km E of Bairoil, Wyoming | M3.3 | 68 km | 5 km |
| Jun 3, 2023 | 8 km SSE of Saratoga, Wyoming | M3.3 | 57 km | 12 km |
| Mar 29, 2022 | 10 km NNW of Ryan Park, Wyoming | M3.3 | 52 km | 5 km |
| Jan 19, 2022 | 8 km ESE of Saratoga, Wyoming | M3.3 | 51 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
41 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 1 injury.
| Date | Rating | Distance | Path | Fatalities |
| Jun 6, 2018 | EF3 | 86 km | 11.3 mi | 0 |
| Jun 6, 2018 | EF2 | 94 km | 0.6 mi | 0 |
| Jul 2, 1976 | EF2 | 52 km | 2.5 mi | 0 |
| Jun 6, 2020 | EF1 | 48 km | 1.2 mi | 0 |
| Jul 6, 2019 | EF1 | 77 km | 4.0 mi | 0 |
| Jul 7, 1988 | EF1 | 70 km | 0.5 mi | 0 |
| Jun 5, 1977 | EF1 | 59 km | 0.1 mi | 0 |
| Aug 9, 1974 | EF1 | 86 km | 0.1 mi | 0 |
| Jul 15, 1967 | EF1 | 75 km | 1.3 mi | 0 |
| Jun 15, 1966 | EF1 | 58 km | 7.7 mi | 0 |
| May 29, 1964 | EF1 | 55 km | 0.5 mi | 0 |
| Jun 12, 1962 | EF1 | 92 km | 1.0 mi | 0 |
| Jul 3, 1960 | EF1 | 61 km | 1.5 mi | 0 |
| Jul 20, 1958 | EF1 | 84 km | 1.9 mi | 0 |
| Jul 16, 1953 | EF1 | 65 km | 0.1 mi | 0 |
| Jun 15, 2015 | EF0 | 43 km | 1.0 mi | 0 |
| May 23, 2015 | EF0 | 70 km | 0.3 mi | 0 |
| May 23, 2014 | EF0 | 97 km | 2.0 mi | 0 |
| Aug 12, 2013 | EF0 | 77 km | 0.1 mi | 0 |
| Aug 27, 2002 | EF0 | 93 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: MULLEN (179,894 acres, 2020).
| Year | Name | Acres Burned | Distance |
| 2020 | MULLEN | 179,894 | 90 km |
| 2018 | RYAN | 28,858 | 92 km |
| 2019 | PEDRO MOUNTAIN | 21,904 | 56 km |
| 2018 | BADGER CREEK | 20,752 | 98 km |
| 2020 | RR 316 | 14,274 | 5 km |
| 2006 | JACKSON CANYON | 11,686 | 97 km |
| 2012 | SQUIRREL CREEK | 10,768 | 90 km |
| 2012 | SHEEP HERDER HILL COMPLEX | 10,759 | 100 km |
| 2012 | BEAR MOUNTAIN COMPLEX | 8,196 | 65 km |
| 2000 | DEADHORSE | 6,252 | 95 km |
| 2012 | RUSSELS CAMP | 5,811 | 94 km |
| 1999 | JEP | 4,647 | 83 km |
| 2004 | PENNOCK RX | 3,593 | 45 km |
| 2012 | SEMINOE | 3,570 | 45 km |
| 1996 | BEAR CREEK | 3,367 | 100 km |
| 1993 | DUNES | 3,161 | 97 km |
| 2017 | KEYSTONE | 2,784 | 81 km |
| 1999 | CHACE | 2,591 | 12 km |
| 2011 | TB35 MARKING PEN CREEK | 2,448 | 44 km |
| 2016 | BROADWAY | 1,956 | 94 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 0.6 in | Coldest, Driest |
| February | 24°F (-4°C) | 0.6 in | |
| March | 31°F (-0°C) | 0.8 in | |
| April | 39°F (4°C) | 1.5 in | |
| May | 48°F (9°C) | 1.6 in | Wettest |
| June | 59°F (15°C) | 1.3 in | |
| July | 65°F (18°C) | 0.9 in | Warmest |
| August | 64°F (18°C) | 0.8 in | |
| September | 55°F (13°C) | 1.0 in | |
| October | 44°F (7°C) | 1.0 in | |
| November | 31°F (-1°C) | 0.8 in | |
| December | 23°F (-5°C) | 0.6 in |
Hanna has a seasonal temperature swing of 45°F / from 20°F in January to 65°F in July. Total annual precipitation is 11.7 inches, with May being the wettest month (1.6") and January the driest (0.6").