| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 46°F | 33°F | 2.2" |
| February | 28°F | 54°F | 39°F | 1.8" |
| March | 35°F | 66°F | 49°F | 3.9" |
| April | 41°F | 70°F | 53°F | 2.6" |
| May | 52°F | 79°F | 65°F | 4.6" |
| June | 60°F | 88°F | 73°F | 5.6" |
| July | 64°F | 95°F | 79°F | 5.7" |
| August | 66°F | 94°F | 79°F | 3.5" |
| September | 60°F | 90°F | 73°F | 1.7" |
| October | 46°F | 78°F | 60°F | 2.6" |
| November | 31°F | 66°F | 46°F | 0.6" |
| December | 22°F | 51°F | 34°F | 1.6" |
| Index | Optima | Oklahoma | National |
| Air quality index | 15 | 55 | 42 |
| Pollution index | 1,265,680 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 304 |
| Days with good air quality | 301 |
| Days with moderate air quality | 3 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Hardesty, OK | 344 | 15 | 70.0% |
| Hooker, OK | 1,559 | 15 | 70.0% |
| Guymon, OK | 11,761 | 44 | 12.0% |
| Optima, OK | 330 | 15 | 70.0% |
| City | Population | Air Quality Index | National Avg. |
| Brooker, FL | 330 | 35 | 30.0% |
| Epworth, GA | 330 | 1 | 98.0% |
| East Carondelet, IL | 330 | 54 | 8.0% |
| Medora, IL | 330 | 54 | 8.0% |
| New Douglas, IL | 330 | 54 | 8.0% |
| Optima, OK | 330 | 15 | 70.0% |