| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 48°F | 37°F | 14.0" |
| February | 33°F | 54°F | 41°F | 4.0" |
| March | 44°F | 66°F | 53°F | 2.2" |
| April | 46°F | 69°F | 56°F | 6.4" |
| May | 57°F | 79°F | 66°F | 6.4" |
| June | 65°F | 86°F | 74°F | 8.7" |
| July | 67°F | 89°F | 77°F | 10.0" |
| August | 70°F | 92°F | 79°F | 12.5" |
| September | 63°F | 86°F | 73°F | 10.7" |
| October | 49°F | 74°F | 60°F | 6.1" |
| November | 41°F | 64°F | 50°F | 31.2" |
| December | 29°F | 51°F | 38°F | 4.9" |
| Index | Dennis | Oklahoma | National |
| Air quality index | 38 | 55 | 42 |
| Pollution index | 1,549,330 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 289 |
| Days with moderate air quality | 73 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.230% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.070% |
| Mercury | 0.210% |
| City | Population | Air Quality Index | National Avg. |
| Tagg Flats, OK | 0 | 36 | 28.0% |
| New Eucha, OK | 399 | 36 | 28.0% |
| Strang, OK | 85 | 36 | 28.0% |
| Old Eucha, OK | 31 | 36 | 28.0% |
| Hoot Owl, OK | 0 | 36 | 28.0% |
| Dennis, OK | 91 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Lowell Point, AK | 91 | 31 | 38.0% |
| Guion, AR | 91 | 36 | 28.0% |
| Hat Creek, CA | 91 | 42 | 16.0% |
| Lake Davis, CA | 91 | 44 | 12.0% |
| Peoria, CO | 91 | 58 | 16.0% |
| Dennis, OK | 91 | 38 | 24.0% |
Here are the best places to live in Oklahoma
See the best places to live in Dennis
Most Dangerous States In The US
These are the 10 cheapest cities in Oklahoma