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Weather & Climate in Glenrock, WY

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Glenrock experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 27°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 15.9 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 5,032 feet.

Temperature

27°F Jan (-3°C) 72°F Jul (22°C)
Annual Average47.1°F
13% below US avg
January Average27°F (-3°C)
July Average72°F (22°C)
Sunny Days302 days/yr

Geography

Elevation5,032 ft (1,534 m)
Area2.3 sq mi (5.9 km²)
Population Density1,220/sq mi
Coordinates42.8565°N, 105.8624°W
TimezoneAmerica/Denver
CountyConverse County County
Nearest AirportCasper/Natrona County International (CPR)
31 miles away

Precipitation & Snow

Annual Rainfall 15.9"
58% below US avg
Wettest Month (May) 2.32"
Driest Month (Jan) 0.47"

Air Quality

AQI Median34.0
RatingGood

Natural Hazard Risk

Overall RiskVery Low
Risk Score31.4 / 100
Social Vulnerability42.4 / 100
Community Resilience12.3 / 100

Hazard Breakdown

Tornado Very Low
Earthquake Very Low
Wildfire Relatively Moderate
Flood Relatively Low
Hail Relatively Low
Strong Wind Very Low
Heat Wave Very Low
Winter Weather Relatively Moderate
Lightning Relatively Low
Ice Storm Very Low
Drought Very Low
Cold Wave Relatively Moderate
Landslide Very Low
Avalanche Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

53 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.2.

Oct 19, 1996 21 km E of Antelope Hills, Wyoming M4.2 30 km 5 km
Nov 3, 2017 57 km S of Ten Sleep, Wyoming M4.0 144 km 17 km
Apr 13, 2021 51 km S of Ten Sleep, Wyoming M3.9 146 km 12 km
Aug 2, 2021 12 km NW of Rolling Hills, Wyoming M3.8 16 km 10 km
Aug 29, 2004 16 km NNW of Douglas, Wyoming M3.8 31 km 5 km
Feb 1, 2003 11 km E of Antelope Hills, Wyoming M3.7 36 km 5 km
Feb 13, 2023 Wyoming M3.7 147 km 10 km
Oct 10, 1993 41 km W of Esterbrook, Wyoming M3.7 48 km 5 km
Apr 9, 1996 34 km SW of Edgemont, South Dakota M3.7 145 km 5 km
Jul 23, 1993 29 km WNW of Esterbrook, Wyoming M3.7 44 km 5 km
Aug 6, 1998 18 km NNE of Rawlins, Wyoming M3.6 148 km 10 km
Aug 31, 1992 34 km WNW of Kaycee, Wyoming M3.6 144 km 5 km
Feb 15, 2004 19 km N of Douglas, Wyoming M3.5 39 km 10 km
Aug 13, 2004 35 km SW of Alcova, Wyoming M3.5 110 km 5 km
Oct 8, 2009 31 km SSW of Alcova, Wyoming M3.4 104 km 5 km
Sep 3, 2023 32 km NW of Kaycee, Wyoming M3.3 146 km 5 km
Aug 26, 2022 27 km E of Bairoil, Wyoming M3.3 132 km 5 km
Oct 31, 2017 56 km S of Ten Sleep, Wyoming M3.2 149 km 15 km
Jul 22, 2020 16 km NW of Rolling Hills, Wyoming M3.2 19 km 34 km
Dec 13, 1993 14 km SW of Esterbrook, Wyoming M3.2 65 km 5 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

110 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 26 injuries.

Date Rating Distance Path Fatalities
Jul 28, 2018 EF3 37 km 4.4 mi 0
Jun 23, 2023 EF2 82 km 3.8 mi 0
Jul 21, 1987 EF2 76 km 5.0 mi 0
Jun 18, 1987 EF2 41 km 7.0 mi 0
Jun 13, 1984 EF2 98 km 4.0 mi 0
Jun 5, 1982 EF2 36 km 7.0 mi 0
Jun 5, 1982 EF2 99 km 1.0 mi 0
Jul 28, 1978 EF2 99 km 5.0 mi 0
Jul 20, 1978 EF2 41 km 1.0 mi 0
May 29, 1971 EF2 28 km 0.2 mi 0
Jun 11, 1962 EF2 57 km 52.0 mi 0
Jun 23, 2023 EF1 63 km 10.8 mi 0
Jul 28, 2018 EF1 48 km 1.8 mi 0
Jun 12, 2017 EF1 33 km 0.5 mi 0
May 24, 1990 EF1 98 km 2.0 mi 0
Jul 7, 1988 EF1 86 km 0.5 mi 0
Jun 18, 1987 EF1 75 km 0.8 mi 0
Jun 12, 1986 EF1 65 km 1.0 mi 0
Jun 13, 1984 EF1 99 km 1.0 mi 0
Jun 13, 1984 EF1 99 km 1.0 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 81 km
1996 OLMSTEAD D 44,562 33 km
2010 ORPHA 25,839 39 km
2018 BRITANIA MOUNTAIN 23,701 96 km
2019 PEDRO MOUNTAIN 21,904 98 km
2024 WILDCAT CREEK 18,751 99 km
1996 GEARY D. 2 15,564 18 km
2006 SAWMILL 15,379 69 km
2002 HENSEL 14,439 71 km
2012 SAWMILL CANYON 13,438 95 km
2006 TWENTY MILE 11,732 67 km
2006 JACKSON CANYON 11,686 49 km
2000 ORMSBY 11,539 34 km
2012 SHEEP HERDER HILL COMPLEX 10,759 34 km
2011 THOMPSON 10,519 94 km
1999 WALKER 10,022 57 km
2015 STATION 9,845 26 km
1996 HENRYS 9,839 43 km
2010 WILLOW CREEK 9,706 60 km
2000 HENDERSON 9,624 59 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 27°F (-3°C) 0.5 in Driest
February 28°F (-2°C) 0.5 in
March 35°F (2°C) 0.8 in
April 43°F (6°C) 1.4 in
May 53°F (11°C) 2.3 in Wettest
June 63°F (17°C) 1.7 in
July 72°F (22°C) 1.3 in Warmest
August 69°F (21°C) 0.8 in
September 59°F (15°C) 0.9 in
October 47°F (8°C) 0.9 in
November 34°F (1°C) 0.7 in
December 26°F (-3°C) 0.5 in Coldest

Glenrock has a seasonal temperature swing of 46°F / from 26°F in December to 72°F in July. Total annual precipitation is 12.3 inches, with May being the wettest month (2.3") and January the driest (0.5").

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