| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 30°F | 54°F | 41°F | 4.3" |
| February | 34°F | 60°F | 45°F | 2.7" |
| March | 43°F | 70°F | 55°F | 4.8" |
| April | 53°F | 77°F | 64°F | 8.7" |
| May | 59°F | 81°F | 69°F | 7.8" |
| June | 71°F | 91°F | 80°F | 7.5" |
| July | 73°F | 94°F | 82°F | 12.8" |
| August | 72°F | 94°F | 82°F | 8.7" |
| September | 67°F | 90°F | 77°F | 5.3" |
| October | 55°F | 79°F | 66°F | 6.7" |
| November | 43°F | 66°F | 53°F | 4.7" |
| December | 34°F | 53°F | 42°F | 3.9" |
| Index | Terlton | Oklahoma | National |
| Air quality index | 45 | 55 | 42 |
| Pollution index | 3,279,710 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 249 |
| Days with moderate air quality | 114 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Cushing, OK | 7,759 | 36 | 28.0% |
| Maramec, OK | 108 | 40 | 20.0% |
| Skedee, OK | 38 | 40 | 20.0% |
| Blackburn, OK | 89 | 40 | 20.0% |
| Cleveland, OK | 3,138 | 45 | 10.0% |
| Terlton, OK | 57 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Crooked Creek, AK | 57 | 31 | 38.0% |
| Crown Point, AK | 57 | 31 | 38.0% |
| Pelican, AK | 57 | 20 | 60.0% |
| Carlton, AL | 57 | 42 | 16.0% |
| Amagon, AR | 57 | 45 | 10.0% |
| Terlton, OK | 57 | 45 | 10.0% |
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