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Weather & Climate in Boulder Flats, WY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Boulder Flats 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. The area gets 302 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 13.2 inches (drier than the 38-inch national average). The area receives 87.6 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 5,583 feet.
Temperature
21°F Jan (-6°C)
72°F Jul (22°C)
| Annual Average | 45.1°F |
| 16% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 5,583 ft (1,702 m) |
| Area | 18.2 sq mi (47.1 km²) |
| Population Density | 26/sq mi |
| Coordinates | 42.9156°N, 108.7993°W |
| Timezone | America/Denver |
| County | Fremont County County |
| Nearest Airport | Central Wyoming Regional (RIW) 20 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 34.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 59.7 / 100 |
| Social Vulnerability | 52.8 / 100 |
| Community Resilience | 11.8 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Relatively Moderate |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Very Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Moderate |
| Volcano | Very Low |
| Avalanche | Relatively Moderate |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
115 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.0.
| Jan 7, 2004 | 20 km ESE of Kelly, Wyoming | M5.0 | 148 km | 3 km |
| Aug 5, 2010 | 19 km E of Kelly, Wyoming | M4.8 | 150 km | 5 km |
| Sep 21, 2013 | 20 km W of Fort Washakie, Wyoming | M4.8 | 28 km | 76 km |
| Aug 27, 2016 | 4 km ENE of Bondurant, Wyoming | M4.8 | 131 km | 12 km |
| Dec 28, 1993 | 38 km NE of Bondurant, Wyoming | M4.7 | 125 km | 8 km |
| Sep 27, 2001 | 35 km WSW of Dubois, Wyoming | M4.3 | 118 km | 5 km |
| Aug 17, 2010 | 22 km E of Kelly, Wyoming | M4.1 | 146 km | 5 km |
| Jan 7, 2004 | 18 km ESE of Kelly, Wyoming | M4.0 | 150 km | 5 km |
| Feb 26, 2016 | 23 km SE of Kelly, Wyoming | M4.0 | 144 km | 5 km |
| Oct 10, 1992 | 25 km SSE of Riverton, Wyoming | M4.0 | 47 km | 5 km |
| Nov 3, 2017 | 57 km S of Ten Sleep, Wyoming | M4.0 | 133 km | 17 km |
| May 26, 2000 | 5 km S of Bairoil, Wyoming | M4.0 | 129 km | 5 km |
| Apr 13, 2021 | 51 km S of Ten Sleep, Wyoming | M3.9 | 137 km | 12 km |
| Apr 1, 2011 | 22 km NW of Daniel, Wyoming | M3.9 | 120 km | 5 km |
| Oct 3, 2000 | 22 km E of Kelly, Wyoming | M3.9 | 147 km | 7 km |
| Nov 26, 1993 | 36 km NNE of Bondurant, Wyoming | M3.8 | 129 km | 5 km |
| Feb 12, 2023 | 20 km ESE of Kelly, Wyoming | M3.7 | 147 km | 8 km |
| Oct 21, 1996 | 42 km ESE of Boulder, Wyoming | M3.7 | 56 km | 5 km |
| Jun 22, 1996 | 40 km ESE of Kelly, Wyoming | M3.7 | 128 km | 5 km |
| Jun 1, 1993 | 6 km N of Bairoil, Wyoming | M3.7 | 121 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
28 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 4 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 16, 1962 | EF3 | 6 km | 0.5 mi | 0 |
| Jun 7, 1986 | EF2 | 65 km | 2.0 mi | 0 |
| Aug 27, 1973 | EF2 | 38 km | 0.5 mi | 0 |
| Jun 6, 1967 | EF2 | 42 km | 8.2 mi | 0 |
| May 6, 2014 | EF1 | 57 km | 1.5 mi | 0 |
| Jun 6, 1997 | EF1 | 40 km | 2.0 mi | 0 |
| Aug 3, 1980 | EF1 | 65 km | 0.1 mi | 0 |
| Aug 3, 1976 | EF1 | 78 km | 0.1 mi | 0 |
| Jun 6, 1968 | EF1 | 40 km | 3.0 mi | 0 |
| Jun 5, 1968 | EF1 | 36 km | 0.1 mi | 0 |
| Jun 14, 1967 | EF1 | 33 km | 0.5 mi | 0 |
| Apr 23, 1964 | EF1 | 33 km | 0.5 mi | 0 |
| Sep 9, 2024 | EF0 | 94 km | 0.2 mi | 0 |
| Sep 4, 2024 | EF0 | 93 km | 0.1 mi | 0 |
| Aug 11, 2020 | EF0 | 30 km | 0.2 mi | 0 |
| May 28, 2018 | EF0 | 65 km | 0.5 mi | 0 |
| Jun 3, 2014 | EF0 | 95 km | 2.2 mi | 0 |
| May 6, 2014 | EF0 | 48 km | 4.8 mi | 0 |
| Jun 14, 2009 | EF0 | 94 km | 0.7 mi | 0 |
| Jun 3, 2009 | EF0 | 95 km | 0.9 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: KATESBASIN (141,128 acres, 2000).
| Year | Name | Acres Burned | Distance |
| 2000 | KATESBASIN | 141,128 | 74 km |
| 2012 | ALPINE LAKE | 39,158 | 45 km |
| 1988 | FAYETTE | 29,234 | 64 km |
| 2008 | NEW FORK | 14,481 | 88 km |
| 2002 | SOUTH FORK II | 13,803 | 23 km |
| 2002 | PASS CREEK | 13,724 | 31 km |
| 1996 | FAYETTE | 5,308 | 78 km |
| 2000 | MUDDYCRK | 4,601 | 86 km |
| 2007 | COPPER MTN. | 4,458 | 87 km |
| 1989 | ANNS | 3,298 | 42 km |
| 2006 | JIM CREEK WFU | 2,835 | 97 km |
| 2002 | DIVIDE | 2,831 | 53 km |
| 2007 | SALT LICK | 2,527 | 99 km |
| 2022 | WASHAKIE PARK | 2,337 | 28 km |
| 1988 | WISE FLAT | 2,232 | 74 km |
| 2001 | BEAVER RIM | 2,171 | 45 km |
| 2000 | SPRING MNT | 1,820 | 82 km |
| 2000 | MURPHYDRAW | 1,615 | 37 km |
| 1994 | 17 MILE 6 | 1,564 | 23 km |
| 2000 | RED CANYON | 1,500 | 36 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 21°F (-6°C) | 0.4 in | |
| February | 24°F (-5°C) | 0.4 in | Driest |
| March | 35°F (1°C) | 0.8 in | |
| April | 43°F (6°C) | 1.6 in | |
| May | 53°F (11°C) | 2.1 in | Wettest |
| June | 62°F (17°C) | 1.1 in | |
| July | 72°F (22°C) | 0.8 in | Warmest |
| August | 67°F (20°C) | 0.6 in | |
| September | 57°F (14°C) | 1.0 in | |
| October | 45°F (7°C) | 1.1 in | |
| November | 30°F (-1°C) | 0.7 in | |
| December | 19°F (-7°C) | 0.4 in | Coldest |
Boulder Flats has a seasonal temperature swing of 52°F / from 19°F in December to 72°F in July. Total annual precipitation is 10.9 inches, with May being the wettest month (2.1") and February the driest (0.4").