| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 53°F | 38°F | 0.9" |
| February | 30°F | 55°F | 41°F | 1.0" |
| March | 41°F | 67°F | 52°F | 1.8" |
| April | 49°F | 74°F | 60°F | 3.4" |
| May | 57°F | 83°F | 69°F | 4.0" |
| June | 69°F | 94°F | 80°F | 3.5" |
| July | 72°F | 97°F | 84°F | 2.9" |
| August | 71°F | 96°F | 82°F | 4.2" |
| September | 63°F | 87°F | 74°F | 3.2" |
| October | 51°F | 76°F | 62°F | 2.6" |
| November | 40°F | 63°F | 50°F | 1.5" |
| December | 30°F | 51°F | 39°F | 1.0" |
| Index | Clinton | Oklahoma | National |
| Air quality index | 43 | 55 | 42 |
| Pollution index | 475,888 | 1,271,533 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 285 |
| Days with moderate air quality | 80 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Arapaho, OK | 953 | 43 | 14.0% |
| Foss, OK | 163 | 43 | 14.0% |
| Butler, OK | 268 | 43 | 14.0% |
| Bessie, OK | 253 | 43 | 14.0% |
| New Cordell, OK | 2,753 | 43 | 14.0% |
| Clinton, OK | 9,117 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Fallston, MD | 9,118 | 46 | 8.0% |
| Yorkshire, VA | 9,118 | 47 | 6.0% |
| Columbia City, IN | 9,115 | 45 | 10.0% |
| Greenville, RI | 9,114 | 44 | 12.0% |
| New Glasgow, NS | 9,114 | n/a | |
| Clinton, OK | 9,117 | 43 | 14.0% |
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