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Weather & Climate in Derby, CO

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

Derby experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 32°F in January while summers reach 75°F in July. The area gets 330 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 15.4 inches (drier than the 38-inch national average). The area receives 49.0 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 5,126 feet.

Temperature

32°F Jan (0°C) 75°F Jul (24°C)
Annual Average51.4°F
5% below US avg
January Average32°F (0°C)
July Average75°F (24°C)
Sunny Days330 days/yr

Geography

Elevation5,126 ft (1,562 m)
Area1.8 sq mi (4.6 km²)
Population Density4,967/sq mi
Coordinates39.8408°N, 104.9163°W
TimezoneAmerica/Denver
CountyDenver County County
Nearest AirportDenver International (DEN)
13 miles away

Precipitation & Snow

Annual Rainfall 15.4"
60% below US avg
Snowfall 49.0"
Wettest Month (May) 2.52"
Driest Month (Jan) 0.51"

Air Quality

AQI Median41.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively High
Risk Score95.2 / 100
Social Vulnerability17.8 / 100
Community Resilience68.5 / 100

Hazard Breakdown

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

Earthquake History

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

Dec 25, 1994 9 km NE of Larkspur, Colorado M4.0 62 km 10 km
Dec 23, 1995 7 km WNW of Rock Creek Park, Colorado M3.5 123 km 5 km
Jan 18, 1997 8 km SE of Westcreek, Colorado M3.3 84 km 5 km
Jun 1, 2014 9 km NNW of Kersey, Colorado M3.2 74 km 1 km
Jul 22, 2001 6 km WNW of Woodland Park, Colorado M3.1 93 km 5 km
Sep 12, 1990 13 km NW of Silverthorne, Colorado M3.0 111 km 5 km
Feb 26, 2008 29 km WNW of Westcreek, Colorado M2.9 79 km 2 km
Jan 19, 1997 8 km SE of Westcreek, Colorado M2.9 84 km 5 km
Mar 30, 2019 7 km NE of Greeley, Colorado M2.9 73 km 6 km
Dec 31, 1995 6 km WNW of Rock Creek Park, Colorado M2.8 125 km 5 km
Jun 21, 2018 16 km SSW of Walden, Colorado M2.7 149 km 2 km
Jan 19, 1997 8 km SE of Westcreek, Colorado M2.7 84 km 5 km
Apr 18, 1998 8 km SE of Westcreek, Colorado M2.7 84 km 5 km
Jun 13, 2025 7 km SE of Erie, Colorado M2.7 19 km 9 km
Aug 23, 2016 2 km SSE of Eaton, Colorado M2.6 76 km 10 km
Jun 23, 2014 6 km NNE of Kersey, Colorado M2.5 74 km 5 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

751 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 1 fatality, 161 injuries.

Date Rating Distance Path Fatalities
Jun 4, 2015 EF3 48 km 6.7 mi 0
May 22, 2008 EF3 46 km 38.7 mi 1
Jun 15, 1988 EF3 12 km 2.5 mi 0
Jun 12, 1982 EF3 33 km 3.0 mi 0
May 18, 1975 EF3 17 km 4.1 mi 0
May 15, 1952 EF3 62 km 7.4 mi 0
Jun 7, 2021 EF2 33 km 7.5 mi 0
May 7, 2016 EF2 77 km 8.8 mi 0
Jun 7, 2012 EF2 94 km 7.5 mi 0
Jun 15, 2009 EF2 71 km 4.0 mi 0
May 10, 2004 EF2 97 km 6.0 mi 0
Jul 31, 1996 EF2 75 km 5.0 mi 0
Jul 30, 1996 EF2 98 km 0.5 mi 0
Jul 13, 1996 EF2 44 km 12.0 mi 0
May 30, 1996 EF2 98 km 1.0 mi 0
Jun 9, 1990 EF2 98 km 23.0 mi 0
Jun 15, 1988 EF2 12 km 0.5 mi 0
Jun 5, 1988 EF2 18 km 0.5 mi 0
Jun 5, 1988 EF2 18 km 2.0 mi 0
Jul 7, 1987 EF2 78 km 5.0 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: HAYMAN (129,417 acres, 2002).

Year Name Acres Burned Distance
2002 HAYMAN 129,417 76 km
2012 HIGH PARK 90,769 98 km
2020 WILLIAMS FORK 14,679 91 km
2013 BLACK FOREST 11,885 91 km
1996 BUFFALO CREEK 11,690 59 km
2000 BOBCAT 10,444 78 km
2020 CALWOOD 9,836 49 km
2000 HIGH MEADOWS 9,607 62 km
2001 MVD PSFRXASST 4 7,375 71 km
2021 MARSHALL 6,286 26 km
2010 FOURMILE CANYON 5,865 46 km
2002 BIG ELK 4,348 65 km
2021 BIJOU 3,485 89 km
2012 LOWER NORTH FORK FIRE 3,436 49 km
2003 OVERLAND 3,232 49 km
2009 OLD STAGE 3,160 42 km
2011 CRYSTAL FIRE 2,855 87 km
2002 SCHOONOVER 2,821 72 km
2012 FERN LAKE 2,549 86 km
2020 SUNDAY FIRE 2,204 47 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 32°F (0°C) 0.5 in Driest
February 34°F (1°C) 0.5 in
March 41°F (5°C) 1.4 in
April 48°F (9°C) 2.0 in
May 58°F (14°C) 2.5 in Wettest
June 68°F (20°C) 1.8 in
July 75°F (24°C) 1.9 in Warmest
August 71°F (22°C) 1.6 in
September 63°F (17°C) 1.4 in
October 51°F (11°C) 1.1 in
November 38°F (3°C) 1.0 in
December 31°F (-1°C) 0.6 in Coldest

Derby has a seasonal temperature swing of 44°F / from 31°F in December to 75°F in July. Total annual precipitation is 16.3 inches, with May being the wettest month (2.5") and January the driest (0.5").

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