| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 36°F | 27°F | 5.6" |
| February | 20°F | 37°F | 28°F | 3.2" |
| March | 33°F | 53°F | 42°F | 4.2" |
| April | 44°F | 66°F | 54°F | 7.2" |
| May | 54°F | 75°F | 64°F | 7.5" |
| June | 63°F | 84°F | 73°F | 7.8" |
| July | 64°F | 85°F | 74°F | 7.8" |
| August | 62°F | 84°F | 73°F | 10.6" |
| September | 56°F | 79°F | 66°F | 7.9" |
| October | 45°F | 67°F | 55°F | 7.0" |
| November | 34°F | 53°F | 43°F | 6.5" |
| December | 26°F | 40°F | 32°F | 5.0" |
| Index | Williamsport | Indiana | National |
| Air quality index | 42 | 56 | 42 |
| Pollution index | 9,793,540 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 276 |
| Days with moderate air quality | 89 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.001% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| Ambia, IN | 222 | 42 | 16.0% |
| Attica, IN | 3,256 | 42 | 16.0% |
| Waynetown, IN | 1,007 | 42 | 16.0% |
| Wingate, IN | 315 | 42 | 16.0% |
| Montmorenci, IN | 236 | 42 | 16.0% |
| Williamsport, IN | 1,753 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Bayview CDP (Contra Costa County), CA | 1,753 | 27 | 46.0% |
| Hodgkins, IL | 1,753 | 55 | 10.0% |
| Granite, OK | 1,753 | 43 | 14.0% |
| Cleveland, WI | 1,753 | 38 | 24.0% |
| Durand, WI | 1,753 | 34 | 32.0% |
| Williamsport, IN | 1,753 | 42 | 16.0% |
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