| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 40°F | 31°F | 2.4" |
| February | 22°F | 41°F | 31°F | 2.2" |
| March | 31°F | 52°F | 41°F | 2.8" |
| April | 41°F | 65°F | 52°F | 3.6" |
| May | 51°F | 74°F | 62°F | 3.7" |
| June | 61°F | 82°F | 72°F | 5.4" |
| July | 65°F | 86°F | 75°F | 4.6" |
| August | 62°F | 84°F | 73°F | 3.4" |
| September | 56°F | 78°F | 67°F | 4.7" |
| October | 45°F | 66°F | 55°F | 4.5" |
| November | 35°F | 54°F | 44°F | 2.3" |
| December | 28°F | 45°F | 36°F | 3.3" |
| Index | Mountville | Pennsylvania | National |
| Air quality index | 45 | 45 | 42 |
| Pollution index | 11,091,200 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 238 |
| Days with moderate air quality | 117 |
| Days w/ poor A.Q. for sensitive groups | 9 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.140% |
| Carbon Tetrachloride | 0.030% |
| Lead | 0.310% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Loganville, PA | 1,311 | 41 | 18.0% |
| Jacobus, PA | 2,510 | 41 | 18.0% |
| Tyler Run, PA | 1,931 | 41 | 18.0% |
| Hallam, PA | 2,642 | 41 | 18.0% |
| Stonybrook, PA | 3,150 | 41 | 18.0% |
| Mountville, PA | 2,850 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Mount Morris, MI | 2,850 | 38 | 24.0% |
| North Algona Wilberforce, ON | 2,850 | n/a | |
| Woodville, TX | 2,849 | 45 | 10.0% |
| Kewaunee, WI | 2,849 | 36 | 28.0% |
| Kechi, KS | 2,848 | 40 | 20.0% |
| Mountville, PA | 2,850 | 45 | 10.0% |
Here are the best places to live in Pennsylvania
See the best places to live in Mountville
These are the largest cities in Pennsylvania
Check out the 10 most dangerous cities in Pennsylvania