| 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. |
| Pine Village, IN | 254 | 42 | 16.0% |
| Veedersburg, IN | 1,989 | 42 | 16.0% |
| State Line City, IN | 138 | 42 | 16.0% |
| Ambia, IN | 222 | 42 | 16.0% |
| Attica, IN | 3,256 | 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% |
Here are the best places to live in Indiana
Check out the 10 most dangerous cities in Indiana
See the best places to live in Williamsport
Most Dangerous Cities In The US