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Dennis, OK
Full City Profile · Oklahoma · Delaware County County
3.1
/5.0
B
Good
206
Population
45/sq mi density
$72,375
Median Income
$44,264 per capita
59°F
Avg Temperature
318 sunny days/yr
522
Violent Crime/100K
2,550 property/100K
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.8 / 5.0
$72,375 median income, 0.0% unemployment
F
Safety
1.0 / 5.0
522 violent crimes/100K (37% above avg)
A
Education
4.4 / 5.0
42.5% bachelor's degree or higher
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. Air quality is rated Good with a median AQI of 45.
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)
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").