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Weather & Climate in Nunn, CO
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Nunn experiences four distinct seasons with an average annual temperature of 47°F (9°C). Winters average 28°F in January while summers reach 71°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 13.4 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 5,214 feet.
Temperature
28°F Jan (-2°C)
71°F Jul (21°C)
| Annual Average | 47.3°F |
| 12% below US avg | |
| January Average | 28°F (-2°C) |
| July Average | 71°F (21°C) |
| Sunny Days | 316 days/yr |
Geography
| Elevation | 5,214 ft (1,589 m) |
| Area | 3.1 sq mi (8.0 km²) |
| Population Density | 107/sq mi |
| Coordinates | 40.7137°N, 104.7888°W |
| Timezone | America/Denver |
| County | Weld County County |
| Nearest Airport | Northern Colorado Regional (FNL) 22 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 89.2 / 100 |
| Social Vulnerability | 11.4 / 100 |
| Community Resilience | 56.2 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Earthquake | Relatively Low |
| Wildfire | Relatively Low |
| Flood | Relatively Moderate |
| Hail | Relatively High |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Very Low |
| Volcano | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
6 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.2.
| Jun 1, 2014 | 9 km NNW of Kersey, Colorado | M3.2 | 31 km | 1 km |
| Mar 30, 2019 | 7 km NE of Greeley, Colorado | M2.9 | 31 km | 6 km |
| Jun 21, 2018 | 16 km SSW of Walden, Colorado | M2.7 | 134 km | 2 km |
| Jun 13, 2025 | 7 km SE of Erie, Colorado | M2.7 | 80 km | 9 km |
| Aug 23, 2016 | 2 km SSE of Eaton, Colorado | M2.6 | 24 km | 10 km |
| Jun 23, 2014 | 6 km NNE of Kersey, Colorado | M2.5 | 37 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
600 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 2 fatalities, 177 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 4, 2015 | EF3 | 57 km | 6.7 mi | 0 |
| May 22, 2008 | EF3 | 54 km | 38.7 mi | 1 |
| Jul 16, 1979 | EF3 | 51 km | 8.8 mi | 1 |
| Apr 23, 1960 | EF3 | 51 km | 17.2 mi | 0 |
| May 15, 1952 | EF3 | 47 km | 7.4 mi | 0 |
| Jun 7, 2021 | EF2 | 65 km | 7.5 mi | 0 |
| May 27, 2018 | EF2 | 68 km | 1.0 mi | 0 |
| Jun 12, 2017 | EF2 | 44 km | 15.0 mi | 0 |
| May 7, 2016 | EF2 | 75 km | 8.8 mi | 0 |
| May 18, 2010 | EF2 | 63 km | 1.5 mi | 0 |
| May 22, 2008 | EF2 | 52 km | 25.1 mi | 0 |
| Jul 31, 1996 | EF2 | 37 km | 5.0 mi | 0 |
| Jul 30, 1996 | EF2 | 80 km | 0.5 mi | 0 |
| May 30, 1996 | EF2 | 97 km | 1.0 mi | 0 |
| Jun 9, 1990 | EF2 | 15 km | 23.0 mi | 0 |
| May 24, 1990 | EF2 | 85 km | 5.0 mi | 0 |
| Jun 5, 1988 | EF2 | 81 km | 2.0 mi | 0 |
| Jun 5, 1988 | EF2 | 88 km | 0.5 mi | 0 |
| Jul 7, 1987 | EF2 | 50 km | 5.0 mi | 0 |
| Jul 2, 1987 | EF2 | 93 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: CAMERON PEAK (208,910 acres, 2020).
| Year | Name | Acres Burned | Distance |
| 2020 | CAMERON PEAK | 208,910 | 65 km |
| 2012 | HIGH PARK | 90,769 | 48 km |
| 2000 | BOBCAT | 10,444 | 51 km |
| 2020 | CALWOOD | 9,836 | 77 km |
| 2004 | PICNIC ROCK | 9,014 | 37 km |
| 2024 | HAPPY JACK | 6,585 | 56 km |
| 2021 | MARSHALL | 6,286 | 90 km |
| 2010 | FOURMILE CANYON | 5,865 | 89 km |
| 2002 | UNNAMED | 5,258 | 66 km |
| 2002 | BIG ELK | 4,348 | 71 km |
| 2021 | BIJOU | 3,485 | 90 km |
| 2003 | OVERLAND | 3,232 | 80 km |
| 2004 | ROSETTA LANE | 3,164 | 34 km |
| 2009 | OLD STAGE | 3,160 | 81 km |
| 2005 | LITTLEBEAR | 3,125 | 92 km |
| 2011 | CRYSTAL FIRE | 2,855 | 48 km |
| 2012 | FERN LAKE | 2,549 | 84 km |
| 2002 | UNNAMED | 2,261 | 89 km |
| 2020 | SUNDAY FIRE | 2,204 | 63 km |
| 2017 | CATTLE DRIVE | 2,200 | 28 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 28°F (-2°C) | 0.4 in | Coldest |
| February | 33°F (0°C) | 0.3 in | Driest |
| March | 38°F (4°C) | 1.1 in | |
| April | 46°F (8°C) | 1.5 in | |
| May | 56°F (13°C) | 2.5 in | Wettest |
| June | 66°F (19°C) | 2.1 in | |
| July | 71°F (21°C) | 2.0 in | Warmest |
| August | 70°F (21°C) | 1.5 in | |
| September | 61°F (16°C) | 1.3 in | |
| October | 49°F (10°C) | 0.8 in | |
| November | 36°F (2°C) | 0.6 in | |
| December | 29°F (-2°C) | 0.4 in |
Nunn has a seasonal temperature swing of 43°F / from 28°F in January to 71°F in July. Total annual precipitation is 14.5 inches, with May being the wettest month (2.5") and February the driest (0.3").