| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 39°F | 32°F | 10.2" |
| February | 19°F | 36°F | 27°F | 4.8" |
| March | 33°F | 54°F | 43°F | 4.8" |
| April | 41°F | 65°F | 52°F | 6.8" |
| May | 51°F | 77°F | 64°F | 7.4" |
| June | 62°F | 85°F | 73°F | 4.3" |
| July | 62°F | 85°F | 73°F | 7.7" |
| August | 64°F | 88°F | 75°F | 5.0" |
| September | 56°F | 83°F | 68°F | 7.4" |
| October | 48°F | 70°F | 57°F | 4.5" |
| November | 34°F | 55°F | 44°F | 5.7" |
| December | 24°F | 38°F | 30°F | 5.2" |
| Index | Shirley | Indiana | National |
| Air quality index | 28 | 56 | 42 |
| Pollution index | 1,974,040 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 119 |
| Days with good air quality | 106 |
| Days with moderate air quality | 13 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| 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% |
| Sulphur Springs, IN | 409 | 28 | 44.0% |
| Cadiz, IN | 242 | 28 | 44.0% |
| Knightstown, IN | 2,260 | 28 | 44.0% |
| Wilkinson, IN | 439 | 28 | 44.0% |
| Shirley, IN | 1,055 | 28 | 44.0% |
| City | Population | Air Quality Index | National Avg. |
| Mountain Village, AK | 1,055 | 31 | 38.0% |
| Madison, AR | 1,055 | 45 | 10.0% |
| Lawton, IA | 1,055 | 35 | 30.0% |
| Neola, IA | 1,055 | 40 | 20.0% |
| Seelyville, IN | 1,055 | 45 | 10.0% |
| Shirley, IN | 1,055 | 28 | 44.0% |
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