| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 49°F | 37°F | 6.5" |
| February | 31°F | 52°F | 40°F | 4.6" |
| March | 42°F | 63°F | 51°F | 7.3" |
| April | 49°F | 71°F | 59°F | 8.6" |
| May | 57°F | 77°F | 66°F | 11.2" |
| June | 67°F | 87°F | 76°F | 9.6" |
| July | 69°F | 91°F | 79°F | 10.8" |
| August | 69°F | 90°F | 78°F | 9.2" |
| September | 61°F | 82°F | 71°F | 10.4" |
| October | 49°F | 72°F | 59°F | 8.0" |
| November | 41°F | 61°F | 50°F | 6.4" |
| December | 31°F | 50°F | 39°F | 7.6" |
| Index | Westville | Oklahoma | National |
| Air quality index | 36 | 55 | 42 |
| Pollution index | 454,845 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 291 |
| Days with good air quality | 269 |
| Days with moderate air quality | 22 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Rocky Mountain, OK | 682 | 36 | 28.0% |
| Welling, OK | 709 | 36 | 28.0% |
| Flint Creek, OK | 735 | 36 | 28.0% |
| Peavine, OK | 361 | 36 | 28.0% |
| Fairfield, OK | 714 | 36 | 28.0% |
| Westville, OK | 1,630 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Ashland, NH | 1,630 | 31 | 38.0% |
| Justice, OK | 1,630 | 45 | 10.0% |
| Yukon, Unorganized, YT | 1,630 | n/a | |
| Lookout Mountain, GA | 1,629 | 46 | 8.0% |
| Lake Camelot, IL | 1,631 | 41 | 18.0% |
| Westville, OK | 1,630 | 36 | 28.0% |
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