| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 37°F | 28°F | 3.7" |
| February | 22°F | 40°F | 30°F | 2.7" |
| March | 34°F | 54°F | 43°F | 3.0" |
| April | 44°F | 67°F | 54°F | 5.7" |
| May | 54°F | 76°F | 64°F | 5.7" |
| June | 62°F | 83°F | 72°F | 5.5" |
| July | 64°F | 85°F | 74°F | 5.1" |
| August | 62°F | 84°F | 72°F | 4.8" |
| September | 55°F | 80°F | 66°F | 4.3" |
| October | 45°F | 67°F | 55°F | 4.9" |
| November | 34°F | 53°F | 43°F | 4.5" |
| December | 27°F | 41°F | 33°F | 5.4" |
| Index | Clinton | Indiana | National |
| Air quality index | 45 | 56 | 42 |
| Pollution index | 1,601,640 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 237 |
| Days with moderate air quality | 127 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.040% |
| Mercury | 0.290% |
| City | Population | Air Quality Index | National Avg. |
| Dresser, IN | 37 | 45 | 10.0% |
| Vermilion, IL | 289 | 45 | 10.0% |
| Rosedale, IN | 846 | 45 | 10.0% |
| Brazil, IN | 8,225 | 45 | 10.0% |
| Blanford, IN | 248 | 45 | 10.0% |
| Clinton, IN | 4,679 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Neuville, QC | 4,680 | n/a | |
| Kahaluu, HI | 4,681 | 30 | 40.0% |
| Brielle, NJ | 4,683 | 41 | 18.0% |
| Headland, AL | 4,684 | 35 | 30.0% |
| Baldwin City, KS | 4,684 | 41 | 18.0% |
| Clinton, IN | 4,679 | 45 | 10.0% |
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