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Weather & Climate in Sinclair, WY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Sinclair has a cool climate with an average annual temperature of 43°F (6°C). Winters average 22°F in January while summers reach 68°F in July. The area gets 322 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 9.0 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 6,616 feet.
Temperature
22°F Jan (-5°C)
68°F Jul (20°C)
| Annual Average | 43.1°F |
| 20% below US avg | |
| January Average | 22°F (-5°C) |
| July Average | 68°F (20°C) |
| Sunny Days | 322 days/yr |
Geography
| Elevation | 6,616 ft (2,017 m) |
| Area | 2.4 sq mi (6.3 km²) |
| Population Density | 148/sq mi |
| Coordinates | 41.7761°N, 107.1199°W |
| Timezone | America/Denver |
| County | Carbon County County |
| Nearest Airport | Laramie Regional (LAR) 80 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
73 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 | 63 km | 10 km |
| Oct 10, 1992 | 25 km SSE of Riverton, Wyoming | M4.0 | 148 km | 5 km |
| May 26, 2000 | 5 km S of Bairoil, Wyoming | M4.0 | 60 km | 5 km |
| Mar 19, 2022 | 5 km NW of Ryan Park, Wyoming | M3.8 | 66 km | 11 km |
| Jun 1, 1993 | 6 km N of Bairoil, Wyoming | M3.7 | 70 km | 5 km |
| Oct 10, 1993 | 41 km W of Esterbrook, Wyoming | M3.7 | 126 km | 5 km |
| May 17, 2009 | 24 km WNW of Jeffrey City, Wyoming | M3.7 | 118 km | 5 km |
| Jul 23, 1993 | 29 km WNW of Esterbrook, Wyoming | M3.7 | 141 km | 5 km |
| Aug 18, 2009 | 19 km N of Craig, Colorado | M3.7 | 127 km | 5 km |
| Jun 2, 2023 | 9 km SSE of Saratoga, Wyoming | M3.6 | 53 km | 1 km |
| Aug 6, 1998 | 18 km NNE of Rawlins, Wyoming | M3.6 | 21 km | 10 km |
| Jun 30, 1998 | 8 km NNW of Point of Rocks, Wyoming | M3.6 | 142 km | 6 km |
| Aug 13, 2004 | 35 km SW of Alcova, Wyoming | M3.5 | 59 km | 5 km |
| Apr 20, 2017 | 24 km NE of Maybell, Colorado | M3.5 | 138 km | 13 km |
| Sep 14, 2024 | 9 km SSE of Saratoga, Wyoming | M3.4 | 53 km | 10 km |
| Oct 8, 2009 | 31 km SSW of Alcova, Wyoming | M3.4 | 61 km | 5 km |
| Jan 19, 2022 | 8 km ESE of Saratoga, Wyoming | M3.3 | 51 km | 5 km |
| Jun 3, 2023 | 8 km SSE of Saratoga, Wyoming | M3.3 | 52 km | 12 km |
| May 4, 2015 | 5 km SSW of Encampment, Wyoming | M3.3 | 73 km | 5 km |
| Aug 26, 2022 | 27 km E of Bairoil, Wyoming | M3.3 | 52 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
32 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 1 injury.
| Date | Rating | Distance | Path | Fatalities |
| Jul 2, 1976 | EF2 | 73 km | 2.5 mi | 0 |
| Jun 6, 2020 | EF1 | 69 km | 1.2 mi | 0 |
| Jul 7, 1988 | EF1 | 83 km | 0.5 mi | 0 |
| Jul 15, 1967 | EF1 | 73 km | 1.3 mi | 0 |
| Jun 15, 1966 | EF1 | 67 km | 7.7 mi | 0 |
| May 29, 1964 | EF1 | 26 km | 0.5 mi | 0 |
| Jun 12, 1962 | EF1 | 94 km | 1.0 mi | 0 |
| Jul 3, 1960 | EF1 | 85 km | 1.5 mi | 0 |
| Jul 20, 1958 | EF1 | 72 km | 1.9 mi | 0 |
| Jul 16, 1953 | EF1 | 88 km | 0.1 mi | 0 |
| Jul 7, 2015 | EF0 | 87 km | 0.1 mi | 0 |
| Jun 15, 2015 | EF0 | 90 km | 1.0 mi | 0 |
| Aug 12, 2013 | EF0 | 90 km | 0.1 mi | 0 |
| Jun 3, 2009 | EF0 | 93 km | 0.9 mi | 0 |
| Jun 24, 2003 | EF0 | 100 km | — | 0 |
| Jun 26, 2001 | EF0 | 94 km | 0.2 mi | 0 |
| Aug 10, 1997 | EF0 | 9 km | 1.0 mi | 0 |
| Jun 8, 1997 | EF0 | 22 km | 0.1 mi | 0 |
| Jun 6, 1997 | EF0 | 38 km | 0.1 mi | 0 |
| May 25, 1995 | EF0 | 27 km | 0.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: RYAN (28,858 acres, 2018).
| Year | Name | Acres Burned | Distance |
| 2018 | RYAN | 28,858 | 92 km |
| 2019 | PEDRO MOUNTAIN | 21,904 | 67 km |
| 2020 | RR 316 | 14,274 | 46 km |
| 2012 | BEAR MOUNTAIN COMPLEX | 8,196 | 52 km |
| 1999 | JEP | 4,647 | 37 km |
| 2004 | PENNOCK RX | 3,593 | 53 km |
| 2012 | SEMINOE | 3,570 | 48 km |
| 1993 | DUNES | 3,161 | 54 km |
| 2017 | BIG RED | 2,868 | 97 km |
| 2017 | KEYSTONE | 2,784 | 97 km |
| 1999 | CHACE | 2,591 | 60 km |
| 2016 | SNAKE | 2,557 | 81 km |
| 2011 | TB35 MARKING PEN CREEK | 2,448 | 43 km |
| 2016 | BROADWAY | 1,956 | 87 km |
| 2020 | BRADLEY | 1,901 | 48 km |
| 2000 | ENCAMPMENT COMPLEX | 1,765 | 77 km |
| 1992 | STRATTON | 1,728 | 72 km |
| 1999 | MONUMENT | 1,669 | 49 km |
| 2011 | FERRIS MOUNTAIN | 1,464 | 54 km |
| 1999 | BATTLE CREEK | 1,423 | 84 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-5°C) | 0.6 in | Coldest |
| February | 25°F (-4°C) | 0.5 in | Driest |
| March | 32°F (0°C) | 0.7 in | |
| April | 40°F (4°C) | 1.2 in | |
| May | 49°F (10°C) | 1.4 in | Wettest |
| June | 59°F (15°C) | 1.0 in | |
| July | 68°F (20°C) | 0.9 in | Warmest |
| August | 65°F (19°C) | 0.8 in | |
| September | 56°F (13°C) | 0.9 in | |
| October | 45°F (7°C) | 1.0 in | |
| November | 32°F (-0°C) | 0.7 in | |
| December | 24°F (-4°C) | 0.6 in |
Sinclair has a seasonal temperature swing of 46°F / from 22°F in January to 68°F in July. Total annual precipitation is 10.2 inches, with May being the wettest month (1.4") and February the driest (0.5").