| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 36°F | 28°F | 2.4" |
| February | 21°F | 38°F | 29°F | 2.3" |
| March | 33°F | 52°F | 42°F | 4.0" |
| April | 42°F | 65°F | 53°F | 4.6" |
| May | 53°F | 75°F | 64°F | 4.6" |
| June | 62°F | 83°F | 72°F | 5.5" |
| July | 64°F | 85°F | 74°F | 3.2" |
| August | 61°F | 83°F | 72°F | 3.8" |
| September | 55°F | 78°F | 66°F | 3.0" |
| October | 44°F | 66°F | 55°F | 3.4" |
| November | 34°F | 53°F | 43°F | 3.4" |
| December | 26°F | 41°F | 33°F | 3.6" |
| Index | Markleville | Indiana | National |
| Air quality index | 42 | 56 | 42 |
| Pollution index | 1,974,040 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 237 |
| Days with moderate air quality | 125 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Spiceland, IN | 912 | 28 | 44.0% |
| Shirley, IN | 1,055 | 28 | 44.0% |
| New Castle, IN | 17,234 | 28 | 44.0% |
| Knightstown, IN | 2,260 | 28 | 44.0% |
| Mount Summit, IN | 408 | 28 | 44.0% |
| Markleville, IN | 527 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Crawfordsville, AR | 527 | 45 | 10.0% |
| Thompsonville, IL | 527 | 43 | 14.0% |
| Amo, IN | 527 | 54 | 8.0% |
| Hillsboro, IN | 527 | 42 | 16.0% |
| Rolla, KS | 527 | 15 | 70.0% |
| Markleville, IN | 527 | 42 | 16.0% |
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