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Weather & Climate in Granby, CO

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

Granby has a cool climate with an average annual temperature of 38°F (3°C). Winters average 14°F in January while summers reach 59°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 13.8 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 7,993 feet.

Temperature

14°F Jan (-10°C) 59°F Jul (15°C)
Annual Average37.5°F
31% below US avg
January Average14°F (-10°C)
July Average59°F (15°C)
Sunny Days316 days/yr

Geography

Elevation7,993 ft (2,436 m)
Area12.8 sq mi (33.0 km²)
Population Density173/sq mi
Coordinates40.0648°N, 105.9194°W
TimezoneAmerica/Denver
CountyBoulder County County
Nearest AirportNorthern Colorado Regional (FNL)
55 miles away

Precipitation & Snow

Annual Rainfall 13.8"
64% below US avg
Wettest Month (Aug) 1.85"
Driest Month (Oct) 1.18"

Air Quality

AQI Median41.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively Moderate
Risk Score90.7 / 100
Social Vulnerability11.4 / 100
Community Resilience91.2 / 100

Hazard Breakdown

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

Earthquake History

57 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.0.

Aug 9, 2001 11 km NNE of Chacra, Colorado M4.0 132 km 5 km
Dec 25, 1994 9 km NE of Larkspur, Colorado M4.0 128 km 10 km
Feb 10, 2006 1 km NNE of Chacra, Colorado M3.8 140 km 5 km
Jun 6, 2011 17 km NNW of Oak Creek, Colorado M3.5 102 km 5 km
Aug 21, 2012 12 km SSW of Gypsum, Colorado M3.4 109 km 5 km
Apr 10, 2011 12 km N of Oak Creek, Colorado M3.4 93 km 5 km
May 4, 2015 5 km SSW of Encampment, Wyoming M3.3 144 km 5 km
Jan 18, 1997 8 km SE of Westcreek, Colorado M3.3 128 km 5 km
Jan 15, 2009 29 km SSW of Encampment, Wyoming M3.2 131 km 5 km
Jun 1, 2014 9 km NNW of Kersey, Colorado M3.2 120 km 1 km
Feb 1, 2019 3 km NW of Glenwood Springs, Colorado M3.1 134 km 2 km
Sep 2, 2024 21 km NW of Steamboat Springs, Colorado M3.1 112 km 2 km
Jul 22, 2001 6 km WNW of Woodland Park, Colorado M3.1 134 km 5 km
Jul 8, 1993 9 km ENE of Aspen, Colorado M3.1 115 km 5 km
Sep 12, 1990 13 km NW of Silverthorne, Colorado M3.0 47 km 5 km
Feb 7, 2000 19 km NE of Steamboat Springs, Colorado M3.0 87 km 5 km
May 1, 2009 21 km NW of Dotsero, Colorado M2.9 115 km 5 km
Dec 5, 2000 10 km NNW of Redstone, Colorado M2.9 147 km 5 km
Jan 19, 1997 8 km SE of Westcreek, Colorado M2.9 128 km 5 km
Feb 26, 2008 29 km WNW of Westcreek, Colorado M2.9 96 km 2 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

171 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 63 injuries.

Date Rating Distance Path Fatalities
Jun 4, 2015 EF3 74 km 6.7 mi 0
Jun 15, 1988 EF3 92 km 2.5 mi 0
Jun 7, 2021 EF2 87 km 7.5 mi 0
Jun 15, 1988 EF2 92 km 0.5 mi 0
Jun 5, 1988 EF2 81 km 2.0 mi 0
Jun 5, 1988 EF2 74 km 0.5 mi 0
Jun 8, 1986 EF2 95 km 1.1 mi 0
Jun 3, 1981 EF2 84 km 0.1 mi 0
Jun 3, 1981 EF2 83 km 2.3 mi 0
Oct 15, 1980 EF2 60 km 1.5 mi 0
Jun 13, 1977 EF2 91 km 1.0 mi 0
Jun 4, 1976 EF2 91 km 0.5 mi 0
Jun 4, 1976 EF2 95 km 1.5 mi 0
May 30, 1976 EF2 93 km 5.4 mi 0
May 30, 1957 EF2 97 km 1.3 mi 0
May 30, 1957 EF2 95 km 9.1 mi 0
Jun 22, 2023 EF1 96 km 6.3 mi 0
Jun 24, 2015 EF1 95 km 2.8 mi 0
May 22, 2008 EF1 81 km 0.1 mi 0
Oct 4, 2004 EF1 98 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: CAMERON PEAK (208,910 acres, 2020).

Year Name Acres Burned Distance
2020 CAMERON PEAK 208,910 69 km
2020 EAST TROUBLESOME 188,924 20 km
2012 HIGH PARK 90,769 81 km
2020 MIDDLE FORK 20,886 96 km
2018 SILVER CREEK 20,725 60 km
2002 MT. ZIRKEL COMPLEX (BURN RIDGE) 15,478 97 km
2020 WILLIAMS FORK 14,679 26 km
1996 BUFFALO CREEK 11,690 95 km
2000 BOBCAT 10,444 70 km
2020 CALWOOD 9,836 51 km
2000 HIGH MEADOWS 9,607 88 km
2004 PICNIC ROCK 9,014 93 km
2021 MARSHALL 6,286 64 km
2010 FOURMILE CANYON 5,865 46 km
2021 MUDDY SLIDE 4,372 71 km
2002 BIG ELK 4,348 49 km
2002 GREEN CREEK 4,342 69 km
2021 SYLVAN 3,480 97 km
2012 LOWER NORTH FORK FIRE 3,436 93 km
2003 OVERLAND 3,232 49 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 14°F (-10°C) 1.5 in Coldest
February 20°F (-7°C) 1.2 in
March 27°F (-3°C) 1.4 in
April 35°F (2°C) 1.6 in
May 45°F (7°C) 1.6 in
June 54°F (12°C) 1.5 in
July 59°F (15°C) 1.8 in Warmest
August 58°F (14°C) 1.9 in Wettest
September 50°F (10°C) 1.5 in
October 40°F (4°C) 1.2 in Driest
November 27°F (-3°C) 1.3 in
December 18°F (-8°C) 1.5 in

Granby has a seasonal temperature swing of 45°F / from 14°F in January to 59°F in July. Total annual precipitation is 17.9 inches, with August being the wettest month (1.9") and October the driest (1.2").

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