| 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. |
| Maytown, PA | 4,130 | 41 | 18.0% |
| Felton, PA | 644 | 41 | 18.0% |
| Dallastown, PA | 3,889 | 41 | 18.0% |
| Spry, PA | 4,914 | 41 | 18.0% |
| Yoe, PA | 980 | 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% |
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