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Weather & Climate in Slater, WY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Slater experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 30°F in January while summers reach 71°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 16.8 inches (drier than the 38-inch national average). The area receives 69.8 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 5,069 feet.
Temperature
30°F Jan (-1°C)
71°F Jul (22°C)
| Annual Average | 47.8°F |
| 11% below US avg | |
| January Average | 30°F (-1°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 316 days/yr |
Geography
| Elevation | 5,069 ft (1,545 m) |
| Area | 74.0 sq mi (191.6 km²) |
| Population Density | 1/sq mi |
| Coordinates | 41.8776°N, 104.7887°W |
| Timezone | America/Denver |
| County | Laramie County County |
| Nearest Airport | Cheyenne Regional/Jerry Olson Field (CYS) 50 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 34.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 76.7 / 100 |
| Social Vulnerability | 22.0 / 100 |
| Community Resilience | 49.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Earthquake | Relatively Low |
| Wildfire | Relatively Moderate |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Very Low |
| Winter Weather | Very High |
| Lightning | Relatively High |
| Ice Storm | Relatively High |
| Drought | Very Low |
| Cold Wave | Relatively High |
| Landslide | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
17 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.
| Aug 29, 2004 | 16 km NNW of Douglas, Wyoming | M3.8 | 126 km | 5 km |
| Oct 10, 1993 | 41 km W of Esterbrook, Wyoming | M3.7 | 108 km | 5 km |
| Apr 9, 1996 | 34 km SW of Edgemont, South Dakota | M3.7 | 144 km | 5 km |
| Jul 23, 1993 | 29 km WNW of Esterbrook, Wyoming | M3.7 | 101 km | 5 km |
| Feb 15, 2004 | 19 km N of Douglas, Wyoming | M3.5 | 128 km | 10 km |
| Dec 13, 1993 | 14 km SW of Esterbrook, Wyoming | M3.2 | 77 km | 5 km |
| Aug 22, 2016 | 16 km S of Casper Mountain, Wyoming | M3.2 | 147 km | 5 km |
| May 3, 1996 | 32 km SSW of Edgemont, South Dakota | M3.1 | 144 km | 5 km |
| Jun 30, 1993 | 25 km N of Douglas, Wyoming | M3.0 | 132 km | 5 km |
| Jan 6, 2018 | 7 km SW of Guernsey, Wyoming | M3.0 | 38 km | 5 km |
| Nov 2, 1992 | 5 km ESE of Lusk, Wyoming | M3.0 | 101 km | 5 km |
| Sep 7, 2019 | 23 km WSW of Esterbrook, Wyoming | M2.9 | 82 km | 5 km |
| Apr 13, 2000 | 37 km W of Esterbrook, Wyoming | M2.9 | 103 km | 5 km |
| Mar 10, 2011 | 22 km N of Van Tassell, Wyoming | M2.9 | 124 km | 5 km |
| Dec 19, 2013 | 33 km NE of Rock River, Wyoming | M2.8 | 73 km | 12 km |
| May 28, 2025 | 9 km ENE of Glendo, Wyoming | M2.6 | 74 km | 5 km |
| Feb 27, 2021 | 13 km WNW of Crawford, Nebraska | M2.6 | 137 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
329 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 3 fatalities, 91 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 27, 1955 | EF4 | 82 km | 26.0 mi | 2 |
| Jun 6, 2018 | EF3 | 87 km | 11.3 mi | 0 |
| May 27, 1985 | EF3 | 95 km | 48.0 mi | 0 |
| Jul 16, 1979 | EF3 | 79 km | 8.8 mi | 1 |
| Jul 20, 1978 | EF3 | 73 km | 53.2 mi | 0 |
| Jun 27, 1955 | EF3 | 19 km | 2.0 mi | 0 |
| Jun 26, 1955 | EF3 | 40 km | 2.0 mi | 0 |
| Jun 23, 2023 | EF2 | 96 km | 2.5 mi | 0 |
| Jun 23, 2023 | EF2 | 45 km | 4.7 mi | 0 |
| Sep 10, 2019 | EF2 | 55 km | 19.1 mi | 0 |
| Jun 6, 2018 | EF2 | 85 km | 0.6 mi | 0 |
| May 27, 2018 | EF2 | 72 km | 1.0 mi | 0 |
| Jun 12, 2017 | EF2 | 66 km | 25.6 mi | 0 |
| Jun 7, 2012 | EF2 | 33 km | 20.6 mi | 0 |
| May 18, 2010 | EF2 | 85 km | 1.5 mi | 0 |
| Jun 5, 2009 | EF2 | 44 km | 8.3 mi | 0 |
| May 21, 1998 | EF2 | 68 km | 4.0 mi | 0 |
| Jul 26, 1993 | EF2 | 90 km | 3.8 mi | 0 |
| May 24, 1990 | EF2 | 58 km | 5.0 mi | 0 |
| Jun 20, 1983 | EF2 | 89 km | 0.3 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: ARAPAHO (100,043 acres, 2012).
| Year | Name | Acres Burned | Distance |
| 2012 | ARAPAHO | 100,043 | 63 km |
| 2024 | PLEASANT VALLEY | 28,249 | 49 km |
| 2006 | OLD CHICAGO | 25,218 | 57 km |
| 2018 | BRITANIA MOUNTAIN | 23,701 | 49 km |
| 2016 | SIMMONS | 20,950 | 71 km |
| 2002 | REESE | 19,624 | 48 km |
| 2022 | CARTER CANYON | 15,828 | 83 km |
| 2002 | HENSEL | 14,439 | 70 km |
| 2011 | SQUAW MTN | 14,379 | 37 km |
| 1996 | UNNAMED | 14,279 | 90 km |
| 2012 | SAWMILL CANYON | 13,438 | 62 km |
| 2000 | CO LINE | 10,961 | 31 km |
| 2012 | COW CAMP | 8,567 | 58 km |
| 2006 | TRAILER | 8,040 | 37 km |
| 2024 | HAPPY JACK | 6,585 | 78 km |
| 2001 | LEROY | 5,615 | 52 km |
| 1996 | SPRING CR. | 4,682 | 55 km |
| 1994 | SQUAW MTN. | 4,093 | 37 km |
| 1986 | COLLINS PEAK | 4,078 | 47 km |
| 1988 | UNNAMED | 4,047 | 100 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 30°F (-1°C) | 0.4 in | |
| February | 31°F (-1°C) | 0.4 in | Driest |
| March | 37°F (3°C) | 0.8 in | |
| April | 44°F (7°C) | 1.5 in | |
| May | 54°F (12°C) | 2.6 in | Wettest |
| June | 64°F (18°C) | 2.2 in | |
| July | 71°F (22°C) | 1.9 in | Warmest |
| August | 69°F (20°C) | 1.3 in | |
| September | 59°F (15°C) | 1.2 in | |
| October | 48°F (9°C) | 0.9 in | |
| November | 35°F (2°C) | 0.6 in | |
| December | 29°F (-2°C) | 0.4 in | Coldest |
Slater has a seasonal temperature swing of 42°F / from 29°F in December to 71°F in July. Total annual precipitation is 14.2 inches, with May being the wettest month (2.6") and February the driest (0.4").