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Weather & Climate in Kirby, WY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Kirby has a cool climate with an average annual temperature of 43°F (6°C). Winters average 15°F in January while summers reach 69°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 12.6 inches (drier than the 38-inch national average). The area receives 50.8 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 4,268 feet.
Temperature
15°F Jan (-9°C)
69°F Jul (21°C)
| Annual Average | 42.6°F |
| 21% below US avg | |
| January Average | 15°F (-9°C) |
| July Average | 69°F (21°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 4,268 ft (1,301 m) |
| Area | 0.2 sq mi (0.4 km²) |
| Population Density | 360/sq mi |
| Coordinates | 43.8033°N, 108.1810°W |
| Timezone | America/Denver |
| County | Hot Springs County County |
| Nearest Airport | Worland Municipal (WRL) 16 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 34.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 16.1 / 100 |
| Social Vulnerability | 73.4 / 100 |
| Community Resilience | 13.1 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Relatively Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Very Low |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Moderate |
| Volcano | Very Low |
| Avalanche | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
59 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.8.
| Sep 21, 2013 | 20 km W of Fort Washakie, Wyoming | M4.8 | 120 km | 76 km |
| Oct 10, 1992 | 25 km SSE of Riverton, Wyoming | M4.0 | 110 km | 5 km |
| Nov 3, 2017 | 57 km S of Ten Sleep, Wyoming | M4.0 | 71 km | 17 km |
| Apr 13, 2021 | 51 km S of Ten Sleep, Wyoming | M3.9 | 70 km | 12 km |
| Feb 13, 2023 | Wyoming | M3.7 | 69 km | 10 km |
| May 17, 2009 | 24 km WNW of Jeffrey City, Wyoming | M3.7 | 141 km | 5 km |
| Jul 4, 2021 | 43 km S of Ten Sleep, Wyoming | M3.6 | 67 km | 17 km |
| Aug 31, 1992 | 34 km WNW of Kaycee, Wyoming | M3.6 | 92 km | 5 km |
| Jan 9, 2007 | 7 km ENE of East Thermopolis, Wyoming | M3.5 | 16 km | 5 km |
| Aug 7, 1991 | 31 km NNW of Pavillion, Wyoming | M3.5 | 64 km | 5 km |
| Nov 16, 1993 | 17 km SSE of Ten Sleep, Wyoming | M3.5 | 65 km | 5 km |
| Apr 5, 2002 | 7 km W of South Flat, Wyoming | M3.3 | 17 km | 5 km |
| Sep 3, 2023 | 32 km NW of Kaycee, Wyoming | M3.3 | 101 km | 5 km |
| Oct 31, 2017 | 56 km S of Ten Sleep, Wyoming | M3.2 | 66 km | 15 km |
| Mar 10, 1993 | 27 km W of Midwest, Wyoming | M3.2 | 134 km | 5 km |
| Jan 29, 2012 | 27 km ENE of Atlantic City, Wyoming | M3.2 | 138 km | 5 km |
| Aug 19, 2000 | 36 km W of Jeffrey City, Wyoming | M3.2 | 139 km | 5 km |
| Feb 1, 2011 | 35 km W of Jeffrey City, Wyoming | M3.1 | 140 km | 5 km |
| Apr 25, 1997 | 16 km S of Lander, Wyoming | M3.1 | 132 km | 5 km |
| Aug 24, 2021 | 29 km NE of Boulder, Wyoming | M3.1 | 142 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
59 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 1 fatality, 7 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 1, 2018 | EF2 | 85 km | 1.0 mi | 0 |
| Jun 1, 2018 | EF2 | 90 km | 1.0 mi | 0 |
| Jul 10, 2001 | EF2 | 4 km | 0.5 mi | 0 |
| Jun 7, 1986 | EF2 | 65 km | 2.0 mi | 0 |
| Jul 4, 1978 | EF2 | 79 km | 5.0 mi | 0 |
| Jul 24, 1967 | EF2 | 63 km | 0.1 mi | 0 |
| Jun 6, 1967 | EF2 | 79 km | 8.2 mi | 0 |
| Jul 9, 1962 | EF2 | 63 km | 0.5 mi | 0 |
| Jun 12, 1962 | EF2 | 77 km | 0.5 mi | 0 |
| Jun 26, 1959 | EF2 | 92 km | 9.2 mi | 1 |
| Jun 3, 1958 | EF2 | 87 km | 0.2 mi | 0 |
| Jun 19, 2019 | EF1 | 95 km | 4.1 mi | 0 |
| May 6, 2014 | EF1 | 58 km | 1.5 mi | 0 |
| Aug 30, 2010 | EF1 | 59 km | 4.6 mi | 0 |
| Jun 1, 2009 | EF1 | 58 km | 0.4 mi | 0 |
| Jun 26, 2001 | EF1 | 76 km | 0.7 mi | 0 |
| Jun 6, 1997 | EF1 | 86 km | 1.0 mi | 0 |
| Jun 6, 1997 | EF1 | 92 km | 2.0 mi | 0 |
| Aug 3, 1980 | EF1 | 64 km | 0.1 mi | 0 |
| Aug 3, 1976 | EF1 | 85 km | 0.1 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 | 40 km |
| 1996 | EBLACK MTN | 53,211 | 29 km |
| 1996 | BATES | 47,060 | 56 km |
| 2018 | TEREK | 43,872 | 50 km |
| 2020 | NEIBER | 17,594 | 25 km |
| 2006 | OUTLAW 2 | 12,279 | 100 km |
| 1999 | ROOSTER | 9,624 | 64 km |
| 1996 | WILLOW | 7,723 | 65 km |
| 1996 | BUFFALO 2 | 7,173 | 53 km |
| 2018 | DENVER JAKE | 6,973 | 32 km |
| 1996 | NBROKENBAC | 4,921 | 75 km |
| 2012 | OTTER CREEK-UPPER BEE | 4,786 | 72 km |
| 2000 | MUDDYCRK | 4,601 | 25 km |
| 2000 | MIDDLECREE | 4,534 | 58 km |
| 1996 | ANTLER | 4,492 | 65 km |
| 2007 | COPPER MTN. | 4,458 | 32 km |
| 2018 | ZIMMERMAN | 3,655 | 20 km |
| 2001 | RENNER DRA | 3,627 | 61 km |
| 1999 | LOWER GRAS | 3,489 | 54 km |
| 2017 | BANJO | 3,379 | 27 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 15°F (-9°C) | 0.4 in | Coldest |
| February | 27°F (-3°C) | 0.3 in | Driest |
| March | 37°F (3°C) | 0.7 in | |
| April | 46°F (8°C) | 1.3 in | |
| May | 56°F (13°C) | 2.1 in | Wettest |
| June | 66°F (19°C) | 1.5 in | |
| July | 69°F (21°C) | 0.8 in | |
| August | 71°F (22°C) | 0.7 in | Warmest |
| September | 59°F (15°C) | 1.1 in | |
| October | 47°F (8°C) | 0.9 in | |
| November | 32°F (-0°C) | 0.5 in | |
| December | 21°F (-6°C) | 0.4 in |
Kirby has a seasonal temperature swing of 56°F / from 15°F in January to 71°F in August. Total annual precipitation is 10.5 inches, with May being the wettest month (2.1") and February the driest (0.3").