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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 38°F | 28°F | 3.4" |
| February | 20°F | 40°F | 30°F | 2.3" |
| March | 31°F | 53°F | 41°F | 4.0" |
| April | 41°F | 67°F | 53°F | 4.5" |
| May | 51°F | 75°F | 63°F | 4.1" |
| June | 61°F | 84°F | 72°F | 4.5" |
| July | 63°F | 85°F | 74°F | 4.3" |
| August | 62°F | 85°F | 73°F | 2.9" |
| September | 55°F | 79°F | 67°F | 4.3" |
| October | 44°F | 67°F | 55°F | 3.5" |
| November | 33°F | 55°F | 43°F | 3.1" |
| December | 25°F | 42°F | 33°F | 3.9" |
| Index | Richmond | Indiana | National |
| Air quality index | 6 | 56 | 42 |
| Pollution index | 1,369,080 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 364 |
| Days with moderate air quality | |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Fountain City, IN | 702 | 6 | 88.0% |
| Eaton, OH | 8,154 | 6 | 88.0% |
| Centerville, IN | 2,587 | 6 | 88.0% |
| Whitewater, IN | 40 | 6 | 88.0% |
| New Paris, OH | 1,418 | 6 | 88.0% |
| Richmond, IN | 35,467 | 6 | 88.0% |
| City | Population | Air Quality Index | National Avg. |
| Oswego, IL | 35,470 | 0 | 100.0% |
| Wildwood, MO | 35,476 | 54 | 8.0% |
| Gahanna, OH | 35,442 | 46 | 8.0% |
| Inver Grove Heights, MN | 35,492 | 46 | 8.0% |
| Mount Vernon, WA | 35,502 | 24 | 52.0% |
| Richmond, IN | 35,467 | 6 | 88.0% |
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