| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 41°F | 31°F | 2.7" |
| February | 22°F | 43°F | 32°F | 2.6" |
| March | 33°F | 57°F | 44°F | 4.4" |
| April | 43°F | 69°F | 55°F | 5.1" |
| May | 52°F | 77°F | 64°F | 4.4" |
| June | 61°F | 85°F | 73°F | 4.7" |
| July | 64°F | 87°F | 75°F | 3.7" |
| August | 62°F | 87°F | 74°F | 2.8" |
| September | 55°F | 81°F | 67°F | 3.8" |
| October | 43°F | 69°F | 55°F | 3.8" |
| November | 32°F | 57°F | 43°F | 3.1" |
| December | 27°F | 46°F | 36°F | 4.1" |
| Index | Boston | 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% |
| Somerville, OH | 304 | 6 | 88.0% |
| Centerville, IN | 2,587 | 6 | 88.0% |
| Whitewater, IN | 40 | 6 | 88.0% |
| New Paris, OH | 1,418 | 6 | 88.0% |
| Boston, IN | 160 | 6 | 88.0% |
| City | Population | Air Quality Index | National Avg. |
| Tomales, CA | 160 | 34 | 32.0% |
| Dewy Rose, GA | 160 | 44 | 12.0% |
| Alexander, IA | 160 | 15 | 70.0% |
| Andover, IA | 160 | 42 | 16.0% |
| Stockton, IA | 160 | 46 | 8.0% |
| Boston, IN | 160 | 6 | 88.0% |
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