Weather & Climate in Grover, CO
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Grover experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 27°F in January while summers reach 71°F in July. Annual precipitation totals 15.3 inches (drier than the 38-inch national average). The area receives 34.5 inches of snow annually, a moderate snowfall amount. Air quality is rated Moderate with a median AQI of 54. 41% of days have good air quality. The city sits at an elevation of 5,077 feet.
Temperature
27°F Jan (-3°C)
71°F Jul (22°C)
| Annual Average | 46.9°F |
| 13% below US avg | |
| January Average | 27°F (-3°C) |
| July Average | 71°F (22°C) |
Geography
| Elevation | 5,077 ft (1,547 m) |
| Area | 0.6 sq mi (1.5 km²) |
| Population Density | 298/sq mi |
| Coordinates | 40.8691°N, 104.2259°W |
| Timezone | America/Denver |
| County | Weld County County |
| Nearest Airport | Cheyenne Regional/Jerry Olson Field (CYS) 36 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 54.0 |
| Rating | Moderate |
| Good Days % | 40.7% |
| Unhealthy Days | 21 |
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
5 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 | 55 km | 1 km |
| Mar 30, 2019 | 7 km NE of Greeley, Colorado | M2.9 | 57 km | 6 km |
| Jun 13, 2025 | 7 km SE of Erie, Colorado | M2.7 | 115 km | 9 km |
| Aug 23, 2016 | 2 km SSE of Eaton, Colorado | M2.6 | 57 km | 10 km |
| Jun 23, 2014 | 6 km NNE of Kersey, Colorado | M2.5 | 54 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
681 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 2 fatalities, 131 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 4, 2015 | EF3 | 100 km | 6.7 mi | 0 |
| May 22, 2008 | EF3 | 84 km | 38.7 mi | 1 |
| Jul 16, 1979 | EF3 | 60 km | 8.8 mi | 1 |
| May 10, 1975 | EF3 | 100 km | 8.0 mi | 0 |
| Aug 15, 1974 | EF3 | 91 km | 2.0 mi | 0 |
| Jun 20, 1960 | EF3 | 91 km | 26.1 mi | 0 |
| Apr 23, 1960 | EF3 | 85 km | 17.2 mi | 0 |
| May 15, 1952 | EF3 | 67 km | 7.4 mi | 0 |
| Jun 7, 2021 | EF2 | 99 km | 7.5 mi | 0 |
| Jul 29, 2018 | EF2 | 84 km | 0.1 mi | 0 |
| Jul 29, 2018 | EF2 | 87 km | 0.1 mi | 0 |
| May 27, 2018 | EF2 | 87 km | 1.0 mi | 0 |
| Jun 12, 2017 | EF2 | 10 km | 15.0 mi | 0 |
| May 7, 2016 | EF2 | 71 km | 8.8 mi | 0 |
| May 18, 2010 | EF2 | 37 km | 1.5 mi | 0 |
| Jun 5, 2009 | EF2 | 86 km | 8.3 mi | 0 |
| May 22, 2008 | EF2 | 89 km | 25.1 mi | 0 |
| Jul 31, 1996 | EF2 | 53 km | 5.0 mi | 0 |
| Jul 30, 1996 | EF2 | 62 km | 0.5 mi | 0 |
| Jul 13, 1996 | EF2 | 97 km | 0.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: HIGH PARK (90,769 acres, 2012).
| Year | Name | Acres Burned | Distance |
| 2012 | HIGH PARK | 90,769 | 98 km |
| 2000 | CO LINE | 10,961 | 93 km |
| 2004 | PICNIC ROCK | 9,014 | 86 km |
| 2024 | HAPPY JACK | 6,585 | 74 km |
| 2002 | UNNAMED | 5,258 | 32 km |
| 2021 | 313 | 3,859 | 97 km |
| 2001 | UNNAMED | 3,760 | 98 km |
| 2021 | BIJOU | 3,485 | 78 km |
| 2002 | UNNAMED | 3,275 | 98 km |
| 2004 | ROSETTA LANE | 3,164 | 40 km |
| 2005 | LITTLEBEAR | 3,125 | 90 km |
| 2011 | CRYSTAL FIRE | 2,855 | 98 km |
| 2002 | UNNAMED | 2,261 | 42 km |
| 2021 | CROSS CA | 2,247 | 98 km |
| 2020 | SUNDAY FIRE | 2,204 | 83 km |
| 2017 | CATTLE DRIVE | 2,200 | 67 km |
| 2024 | 139 FIRE | 2,146 | 76 km |
| 2002 | UNNAMED | 2,134 | 35 km |
| 2016 | CO RD 128 | 1,867 | 12 km |
| 1989 | UNNAMED | 1,782 | 94 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 27°F (-3°C) | 0.3 in | Coldest, Driest |
| February | 28°F (-2°C) | 0.4 in | |
| March | 37°F (3°C) | 0.8 in | |
| April | 44°F (7°C) | 1.4 in | |
| May | 54°F (12°C) | 2.4 in | Wettest |
| June | 65°F (18°C) | 2.1 in | |
| July | 71°F (22°C) | 2.2 in | Warmest |
| August | 69°F (20°C) | 1.9 in | |
| September | 60°F (15°C) | 1.9 in | |
| October | 48°F (9°C) | 1.1 in | |
| November | 35°F (2°C) | 0.5 in | |
| December | 27°F (-3°C) | 0.4 in |
Grover has a seasonal temperature swing of 44°F / from 27°F in January to 71°F in July. Total annual precipitation is 15.3 inches, with May being the wettest month (2.4") and January the driest (0.3").