Dennis, OK
Full City Profile · Oklahoma · Delaware County County
4.1
/5.0
A
Great
206
Population
45/sq mi density
$72,375
Median Income
$44,264 per capita
58°F
Avg Temperature
A
Overall
4.1 / 5.0
Strong
B+
Economy
3.8 / 5.0
$72,375 median income, 0.0% unemployment
A
Education
4.4 / 5.0
42.5% bachelor's degree or higher
Dennis enjoys a temperate climate with an average annual temperature of 58°F (14°C). Winters average 36°F in January while summers reach 79°F in July. Annual precipitation totals 49.5 inches. The area receives 5.5 inches of snow annually.
Temperature
36°F Jan (2°C)
79°F Jul (26°C)
| Annual Average | 57.8°F |
| 7% above US avg | |
| January Average | 36°F (2°C) |
| July Average | 79°F (26°C) |
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
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)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 36°F (2°C) | 3.2 in | Coldest |
| February | 40°F (5°C) | 2.5 in | Driest |
| March | 48°F (9°C) | 4.1 in | |
| April | 58°F (14°C) | 4.9 in | |
| May | 66°F (19°C) | 6.2 in | Wettest |
| June | 74°F (23°C) | 5.0 in | |
| July | 79°F (26°C) | 4.1 in | Warmest |
| August | 78°F (26°C) | 3.8 in | |
| September | 70°F (21°C) | 4.5 in | |
| October | 58°F (15°C) | 4.2 in | |
| November | 48°F (9°C) | 3.9 in | |
| December | 39°F (4°C) | 3.0 in |
Dennis has a seasonal temperature swing of 43°F / from 36°F in January to 79°F in July. Total annual precipitation is 49.5 inches, with May being the wettest month (6.2") and February the driest (2.5").