| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 40°F | 31°F | 2.6" |
| February | 23°F | 42°F | 32°F | 2.4" |
| March | 31°F | 53°F | 41°F | 3.1" |
| April | 42°F | 66°F | 54°F | 3.6" |
| May | 51°F | 75°F | 63°F | 3.7" |
| June | 61°F | 84°F | 72°F | 4.8" |
| July | 66°F | 88°F | 77°F | 5.0" |
| August | 64°F | 85°F | 74°F | 4.7" |
| September | 57°F | 79°F | 68°F | 4.4" |
| October | 46°F | 67°F | 56°F | 4.8" |
| November | 35°F | 55°F | 45°F | 2.7" |
| December | 29°F | 45°F | 36°F | 3.8" |
| Index | Bowmansville | Pennsylvania | National |
| Air quality index | 42 | 45 | 42 |
| Pollution index | 11,091,200 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 279 |
| Days with moderate air quality | 80 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| 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. |
| Caln, PA | 1,335 | 42 | 16.0% |
| Denver, PA | 3,847 | 42 | 16.0% |
| Hopeland, PA | 614 | 42 | 16.0% |
| Schoeneck, PA | 950 | 42 | 16.0% |
| Elverson, PA | 1,369 | 42 | 16.0% |
| Bowmansville, PA | 2,684 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Guin, AL | 2,684 | 39 | 22.0% |
| New Richmond, OH | 2,684 | 54 | 8.0% |
| Junction, TX | 2,684 | 49 | 2.0% |
| Black Canyon City, AZ | 2,685 | 74 | 48.0% |
| Bowdon, GA | 2,685 | 38 | 24.0% |
| Bowmansville, PA | 2,684 | 42 | 16.0% |
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