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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 39°F | 30°F | 2.9" |
| February | 22°F | 40°F | 31°F | 2.3" |
| March | 34°F | 55°F | 44°F | 3.8" |
| April | 44°F | 68°F | 55°F | 5.1" |
| May | 54°F | 77°F | 65°F | 4.6" |
| June | 63°F | 85°F | 73°F | 6.3" |
| July | 64°F | 86°F | 75°F | 4.4" |
| August | 62°F | 85°F | 73°F | 3.0" |
| September | 56°F | 80°F | 67°F | 3.6" |
| October | 45°F | 68°F | 56°F | 3.5" |
| November | 34°F | 55°F | 44°F | 3.5" |
| December | 27°F | 43°F | 34°F | 4.1" |
| Index | Shelbyville | Indiana | National |
| Air quality index | 41 | 56 | 42 |
| Pollution index | 1,738,970 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 298 |
| Days with moderate air quality | 66 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.050% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Carthage, IN | 917 | 28 | 44.0% |
| Manilla, IN | 499 | 28 | 44.0% |
| Morristown, IN | 1,182 | 28 | 44.0% |
| Arlington, IN | 291 | 28 | 44.0% |
| St. Paul, IN | 1,125 | 41 | 18.0% |
| Shelbyville, IN | 19,667 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Ronkonkoma, NY | 19,676 | 43 | 14.0% |
| South San Jose Hills, CA | 19,654 | 72 | 44.0% |
| Haslett, MI | 19,651 | 36 | 28.0% |
| Deerfield, IL | 19,650 | 55 | 10.0% |
| Troy, AL | 19,684 | 52 | 4.0% |
| Shelbyville, IN | 19,667 | 41 | 18.0% |
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