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Weather & Climate in Dennis, OK
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Dennis enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 36°F in January while summers reach 80°F in July. The area gets 318 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Air quality is rated Good with a median AQI of 45. The city sits at an elevation of 854 feet.
Temperature
36°F Jan (2°C)
80°F Jul (27°C)
| Annual Average | 58.7°F |
| 9% above US avg | |
| January Average | 36°F (2°C) |
| July Average | 80°F (27°C) |
| Sunny Days | 318 days/yr |
Geography
| Elevation | 854 ft (260 m) |
| Area | 4.5 sq mi (11.7 km²) |
| Population Density | 45/sq mi |
| Coordinates | 36.5473°N, 94.8769°W |
| Timezone | America/Chicago |
| County | Delaware County County |
| Nearest Airport | Grand Lake Regional (NRI) 2 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 45.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 82.7 / 100 |
| Social Vulnerability | 90.9 / 100 |
| Community Resilience | 5.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Relatively Moderate |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Very High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively 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: M2.8.
| Mar 23, 2024 | 9 km SE of Foyil, Oklahoma | M2.8 | 55 km | 5 km |
| Jan 14, 2016 | 7 km W of Talala, Oklahoma | M2.7 | 81 km | 5 km |
| Apr 3, 2016 | Arkansas-Oklahoma border region | M2.7 | 98 km | 5 km |
| Sep 3, 2015 | 6 km WSW of Vera, Oklahoma | M2.6 | 97 km | 5 km |
| May 21, 2010 | 2 km SW of Centerton, Arkansas | M2.6 | 56 km | 1 km |
| Apr 29, 2010 | 3 km SW of Centerton, Arkansas | M2.5 | 56 km | 0 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
804 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 226 fatalities, 2,364 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 22, 2011 | EF5 | 62 km | 21.6 mi | 158 |
| May 10, 2008 | EF4 | 56 km | 75.5 mi | 21 |
| May 4, 2003 | EF4 | 99 km | 33.0 mi | 4 |
| Apr 24, 1993 | EF4 | 96 km | 5.5 mi | 7 |
| Apr 26, 1991 | EF4 | 76 km | 4.0 mi | 0 |
| Apr 24, 1975 | EF4 | 41 km | 11.9 mi | 3 |
| Sep 27, 1959 | EF4 | 47 km | 20.4 mi | 1 |
| Apr 3, 1956 | EF4 | 26 km | 41.8 mi | 0 |
| May 25, 2024 | EF3 | 36 km | 7.9 mi | 0 |
| May 25, 2024 | EF3 | 84 km | 23.9 mi | 2 |
| Mar 30, 2022 | EF3 | 80 km | 5.2 mi | 0 |
| May 22, 2019 | EF3 | 66 km | 9.2 mi | 0 |
| May 22, 2011 | EF3 | 8 km | 17.9 mi | 0 |
| Dec 31, 2010 | EF3 | 67 km | 21.1 mi | 4 |
| Mar 12, 2006 | EF3 | 54 km | 29.0 mi | 0 |
| Mar 12, 2006 | EF3 | 41 km | 25.0 mi | 0 |
| May 4, 2003 | EF3 | 73 km | 49.0 mi | 7 |
| May 4, 2003 | EF3 | 60 km | 25.0 mi | 5 |
| Apr 19, 2000 | EF3 | 96 km | 34.0 mi | 0 |
| Jun 1, 1999 | EF3 | 72 km | 2.0 mi | 2 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (51,112 acres, 2014).
| Year | Name | Acres Burned | Distance |
| 2014 | UNNAMED | 51,112 | 88 km |
| 2007 | UNNAMED | 18,089 | 97 km |
| 2015 | WOLF CREEK | 18,077 | 86 km |
| 2014 | UNNAMED | 14,119 | 98 km |
| 2017 | HILLTOP | 6,523 | 94 km |
| 2009 | TELAMAY HOLLOW | 5,686 | 59 km |
| 2009 | SAWMILL HOLLOW | 5,166 | 56 km |
| 2011 | GRUBER | 4,831 | 95 km |
| 1992 | UNNAMED | 4,546 | 52 km |
| 2005 | FLAT ROCK | 4,472 | 62 km |
| 2004 | UNNAMED | 4,424 | 71 km |
| 1995 | F128 | 4,210 | 57 km |
| 2024 | NATURE FIRE | 3,744 | 56 km |
| 2015 | LITTLE DEER | 3,709 | 90 km |
| 1992 | UNNAMED | 3,700 | 99 km |
| 1986 | UNNAMED | 3,427 | 45 km |
| 2011 | UNNAMED | 3,301 | 98 km |
| 2011 | UNNAMED | 3,285 | 95 km |
| 2004 | UNNAMED | 3,238 | 98 km |
| 2007 | UNNAMED | 3,160 | 23 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 36°F (2°C) | 1.8 in | Coldest, Driest |
| February | 40°F (4°C) | 2.1 in | |
| March | 49°F (10°C) | 3.8 in | |
| April | 59°F (15°C) | 4.0 in | |
| May | 67°F (19°C) | 5.0 in | |
| June | 75°F (24°C) | 4.7 in | |
| July | 80°F (27°C) | 3.1 in | Warmest |
| August | 79°F (26°C) | 3.6 in | |
| September | 72°F (22°C) | 5.0 in | Wettest |
| October | 61°F (16°C) | 3.8 in | |
| November | 49°F (9°C) | 4.0 in | |
| December | 39°F (4°C) | 2.7 in |
Dennis has a seasonal temperature swing of 45°F / from 36°F in January to 80°F in July. Total annual precipitation is 43.6 inches, with September being the wettest month (5.0") and January the driest (1.8").