| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 41°F | 31°F | 5.1" |
| February | 23°F | 44°F | 33°F | 2.7" |
| March | 34°F | 56°F | 44°F | 5.9" |
| April | 46°F | 69°F | 57°F | 6.6" |
| May | 55°F | 76°F | 65°F | 7.1" |
| June | 64°F | 85°F | 74°F | 10.2" |
| July | 64°F | 85°F | 74°F | 6.9" |
| August | 64°F | 85°F | 74°F | 8.4" |
| September | 57°F | 83°F | 69°F | 5.6" |
| October | 46°F | 71°F | 58°F | 6.1" |
| November | 35°F | 56°F | 44°F | 4.0" |
| December | 28°F | 44°F | 35°F | 5.5" |
| Index | Petersburg | Indiana | National |
| Air quality index | 1 | 56 | 42 |
| Pollution index | 728,586 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 350 |
| Days with good air quality | 350 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Washington, IN | 12,514 | 1 | 98.0% |
| Wheatland, IN | 450 | 1 | 98.0% |
| Montgomery, IN | 1,025 | 1 | 98.0% |
| Winslow, IN | 900 | 6 | 88.0% |
| Otwell, IN | 245 | 6 | 88.0% |
| Petersburg, IN | 2,315 | 1 | 98.0% |
| City | Population | Air Quality Index | National Avg. |
| Brighton, IL | 2,315 | 54 | 8.0% |
| Custer, SD | 2,314 | 44 | 12.0% |
| Mayer, MN | 2,313 | 46 | 8.0% |
| Brownsville, PA | 2,313 | 36 | 28.0% |
| Victor, ID | 2,317 | 43 | 14.0% |
| Petersburg, IN | 2,315 | 1 | 98.0% |
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