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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 33°F | 25°F | 2.3" |
| February | 18°F | 35°F | 26°F | 1.9" |
| March | 29°F | 49°F | 38°F | 2.2" |
| April | 39°F | 63°F | 50°F | 3.6" |
| May | 49°F | 73°F | 61°F | 4.2" |
| June | 59°F | 82°F | 71°F | 3.4" |
| July | 62°F | 84°F | 73°F | 4.1" |
| August | 60°F | 83°F | 71°F | 4.1" |
| September | 53°F | 77°F | 64°F | 3.2" |
| October | 43°F | 64°F | 53°F | 3.5" |
| November | 32°F | 51°F | 41°F | 2.7" |
| December | 23°F | 37°F | 30°F | 2.3" |
| Index | Millersburg | Indiana | National |
| Air quality index | 37 | 56 | 42 |
| Pollution index | 1,165,120 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 294 |
| Days with moderate air quality | 71 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.100% |
| Mercury | 0.110% |
| City | Population | Air Quality Index | National Avg. |
| Cromwell, IN | 479 | 37 | 26.0% |
| Milford, IN | 1,664 | 37 | 26.0% |
| Leesburg, IN | 774 | 37 | 26.0% |
| Howe, IN | 707 | 37 | 26.0% |
| Middlebury, IN | 3,582 | 37 | 26.0% |
| Millersburg, IN | 807 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Knik River, AK | 807 | 31 | 38.0% |
| Tranquillity, CA | 807 | 50 | = 100 |
| Earlville, IA | 807 | 39 | 22.0% |
| Hopedale, IL | 807 | 44 | 12.0% |
| Canyon City, OR | 807 | 20 | 60.0% |
| Millersburg, IN | 807 | 37 | 26.0% |
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