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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 41°F | 32°F | 2.9" |
| February | 23°F | 42°F | 32°F | 2.8" |
| March | 32°F | 53°F | 42°F | 3.4" |
| April | 42°F | 66°F | 53°F | 4.0" |
| May | 51°F | 75°F | 63°F | 4.0" |
| June | 61°F | 82°F | 71°F | 4.7" |
| July | 66°F | 87°F | 76°F | 4.9" |
| August | 63°F | 84°F | 73°F | 5.2" |
| September | 56°F | 78°F | 67°F | 4.7" |
| October | 45°F | 67°F | 56°F | 4.5" |
| November | 35°F | 55°F | 45°F | 2.6" |
| December | 29°F | 46°F | 37°F | 4.2" |
| Index | Boyertown | 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 | 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 | 0.260% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.160% |
| Mercury | 1.120% |
| City | Population | Air Quality Index | National Avg. |
| Blandon, PA | 8,046 | 42 | 16.0% |
| Kutztown, PA | 5,051 | 42 | 16.0% |
| Alburtis, PA | 2,604 | 42 | 16.0% |
| Coopersburg, PA | 2,306 | 42 | 16.0% |
| Hereford, PA | 1,486 | 42 | 16.0% |
| Boyertown, PA | 4,061 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| San Castle, FL | 4,061 | 36 | 28.0% |
| Central Kootenay E, BC | 4,061 | n/a | |
| Dannemora, NY | 4,060 | 37 | 26.0% |
| Clearwater, SC | 4,060 | 47 | 6.0% |
| Crescent Springs, KY | 4,062 | 54 | 8.0% |
| Boyertown, PA | 4,061 | 42 | 16.0% |
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