| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 40°F | 31°F | 2.8" |
| February | 23°F | 41°F | 32°F | 1.9" |
| March | 31°F | 52°F | 40°F | 3.4" |
| April | 41°F | 64°F | 52°F | 3.6" |
| May | 50°F | 74°F | 62°F | 4.3" |
| June | 60°F | 82°F | 70°F | 4.9" |
| July | 65°F | 86°F | 75°F | 5.0" |
| August | 62°F | 84°F | 72°F | 5.8" |
| September | 57°F | 78°F | 66°F | 3.9" |
| October | 46°F | 66°F | 55°F | 4.7" |
| November | 36°F | 55°F | 44°F | 2.9" |
| December | 29°F | 45°F | 36°F | 4.3" |
| Index | Sellersville | Pennsylvania | National |
| Air quality index | 42 | 45 | 42 |
| Pollution index | 8,206,310 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 275 |
| Days with moderate air quality | 86 |
| Days w/ poor A.Q. for sensitive groups | 4 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.260% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.160% |
| Mercury | 1.120% |
| City | Population | Air Quality Index | National Avg. |
| Plumsteadville, PA | 2,286 | 41 | 18.0% |
| Doylestown, PA | 8,282 | 41 | 18.0% |
| Bally, PA | 1,300 | 42 | 16.0% |
| Emmaus, PA | 11,438 | 42 | 16.0% |
| Hereford, PA | 1,486 | 42 | 16.0% |
| Sellersville, PA | 4,279 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Osawatomie, KS | 4,279 | 47 | 6.0% |
| Argyle, TX | 4,278 | 51 | 2.0% |
| Prescott, WI | 4,278 | 37 | 26.0% |
| Waimanalo Beach, HI | 4,280 | 30 | 40.0% |
| Millinocket, ME | 4,280 | 31 | 38.0% |
| Sellersville, PA | 4,279 | 42 | 16.0% |
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