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Weather & Climate in South Greeley, WY
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
South Greeley experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 29°F in January while summers reach 69°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 16.0 inches (drier than the 38-inch national average). The area receives 65.6 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 6,053 feet.
Temperature
29°F Jan (-2°C)
69°F Jul (21°C)
| Annual Average | 46.6°F |
| 14% below US avg | |
| January Average | 29°F (-2°C) |
| July Average | 69°F (21°C) |
| Sunny Days | 316 days/yr |
Geography
| Elevation | 6,053 ft (1,845 m) |
| Area | 1.7 sq mi (4.3 km²) |
| Population Density | 2,752/sq mi |
| Coordinates | 41.0931°N, 104.8066°W |
| Timezone | America/Denver |
| County | Laramie County County |
| Nearest Airport | Cheyenne Regional/Jerry Olson Field (CYS) 4 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
11 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.
| Mar 19, 2022 | 5 km NW of Ryan Park, Wyoming | M3.8 | 150 km | 11 km |
| Dec 13, 1993 | 14 km SW of Esterbrook, Wyoming | M3.2 | 149 km | 5 km |
| Jun 1, 2014 | 9 km NNW of Kersey, Colorado | M3.2 | 72 km | 1 km |
| Jan 6, 2018 | 7 km SW of Guernsey, Wyoming | M3.0 | 125 km | 5 km |
| Sep 7, 2019 | 23 km WSW of Esterbrook, Wyoming | M2.9 | 149 km | 5 km |
| Mar 30, 2019 | 7 km NE of Greeley, Colorado | M2.9 | 72 km | 6 km |
| Dec 19, 2013 | 33 km NE of Rock River, Wyoming | M2.8 | 118 km | 12 km |
| Jun 21, 2018 | 16 km SSW of Walden, Colorado | M2.7 | 142 km | 2 km |
| Jun 13, 2025 | 7 km SE of Erie, Colorado | M2.7 | 122 km | 9 km |
| Aug 23, 2016 | 2 km SSE of Eaton, Colorado | M2.6 | 66 km | 10 km |
| Jun 23, 2014 | 6 km NNE of Kersey, Colorado | M2.5 | 76 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
463 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 2 fatalities, 133 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 6, 2018 | EF3 | 84 km | 11.3 mi | 0 |
| Jun 4, 2015 | EF3 | 97 km | 6.7 mi | 0 |
| May 22, 2008 | EF3 | 96 km | 38.7 mi | 1 |
| Jul 16, 1979 | EF3 | 9 km | 8.8 mi | 1 |
| Apr 23, 1960 | EF3 | 35 km | 17.2 mi | 0 |
| Jun 27, 1955 | EF3 | 89 km | 2.0 mi | 0 |
| May 15, 1952 | EF3 | 87 km | 7.4 mi | 0 |
| Jun 23, 2023 | EF2 | 89 km | 4.7 mi | 0 |
| Jun 6, 2018 | EF2 | 76 km | 0.6 mi | 0 |
| May 27, 2018 | EF2 | 32 km | 1.0 mi | 0 |
| Jun 12, 2017 | EF2 | 45 km | 15.0 mi | 0 |
| May 18, 2010 | EF2 | 38 km | 1.5 mi | 0 |
| Jun 5, 2009 | EF2 | 69 km | 8.3 mi | 0 |
| May 22, 2008 | EF2 | 41 km | 25.1 mi | 0 |
| Jul 31, 1996 | EF2 | 75 km | 5.0 mi | 0 |
| Jun 9, 1990 | EF2 | 44 km | 23.0 mi | 0 |
| May 24, 1990 | EF2 | 50 km | 5.0 mi | 0 |
| Jul 7, 1987 | EF2 | 85 km | 5.0 mi | 0 |
| Jun 25, 1982 | EF2 | 81 km | 1.0 mi | 0 |
| Aug 31, 1978 | EF2 | 100 km | 20.9 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: CAMERON PEAK (208,910 acres, 2020).
| Year | Name | Acres Burned | Distance |
| 2020 | CAMERON PEAK | 208,910 | 82 km |
| 2012 | HIGH PARK | 90,769 | 67 km |
| 2011 | SQUAW MTN | 14,379 | 100 km |
| 2000 | CO LINE | 10,961 | 69 km |
| 2000 | BOBCAT | 10,444 | 81 km |
| 2004 | PICNIC ROCK | 9,014 | 55 km |
| 2006 | TRAILER | 8,040 | 83 km |
| 2024 | HAPPY JACK | 6,585 | 20 km |
| 2002 | UNNAMED | 5,258 | 84 km |
| 1994 | SQUAW MTN. | 4,093 | 99 km |
| 2021 | 313 | 3,859 | 74 km |
| 2005 | BROADCAST BURN | 3,230 | 78 km |
| 2004 | ROSETTA LANE | 3,164 | 15 km |
| 2005 | LITTLEBEAR | 3,125 | 50 km |
| 2011 | CRYSTAL FIRE | 2,855 | 73 km |
| 2011 | CHRISTNICK | 2,714 | 92 km |
| 2015 | 2 CA MA IRON MOUNTAIN MIDDLE CANYON PRESCRIBED BURN | 2,517 | 69 km |
| 2002 | UNNAMED | 2,261 | 96 km |
| 2017 | CATTLE DRIVE | 2,200 | 28 km |
| 2024 | 139 FIRE | 2,146 | 51 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-2°C) | 0.4 in | |
| February | 30°F (-1°C) | 0.4 in | Driest |
| March | 35°F (2°C) | 1.1 in | |
| April | 42°F (6°C) | 1.5 in | |
| May | 52°F (11°C) | 2.5 in | Wettest |
| June | 62°F (17°C) | 2.2 in | |
| July | 69°F (21°C) | 2.2 in | Warmest |
| August | 67°F (20°C) | 1.7 in | |
| September | 58°F (14°C) | 1.3 in | |
| October | 47°F (8°C) | 0.8 in | |
| November | 34°F (1°C) | 0.6 in | |
| December | 28°F (-2°C) | 0.4 in | Coldest |
South Greeley has a seasonal temperature swing of 42°F / from 28°F in December to 69°F in July. Total annual precipitation is 15.1 inches, with May being the wettest month (2.5") and February the driest (0.4").