| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 40°F | 30°F | 3.5" |
| February | 20°F | 42°F | 31°F | 3.1" |
| March | 28°F | 53°F | 40°F | 3.4" |
| April | 38°F | 67°F | 52°F | 3.9" |
| May | 48°F | 76°F | 62°F | 3.7" |
| June | 58°F | 84°F | 71°F | 5.5" |
| July | 63°F | 88°F | 75°F | 6.4" |
| August | 61°F | 85°F | 73°F | 5.0" |
| September | 54°F | 80°F | 66°F | 4.5" |
| October | 43°F | 68°F | 55°F | 5.4" |
| November | 33°F | 56°F | 44°F | 2.8" |
| December | 26°F | 45°F | 35°F | 4.9" |
| Index | Belfast | Pennsylvania | National |
| Air quality index | 34 | 45 | 42 |
| Pollution index | 3,167,110 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 349 |
| Days with good air quality | 340 |
| Days with moderate air quality | 9 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.030% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Portland, PA | 549 | 34 | 32.0% |
| Hainesburg, NJ | 117 | 34 | 32.0% |
| East Bangor, PA | 1,098 | 34 | 32.0% |
| Buttzville, NJ | 57 | 34 | 32.0% |
| Roseto, PA | 2,198 | 34 | 32.0% |
| Belfast, PA | 1,305 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Duncannon, PA | 1,305 | 44 | 12.0% |
| Faxon, PA | 1,305 | 35 | 30.0% |
| Fraser, CO | 1,304 | 47 | 6.0% |
| Hastings, FL | 1,304 | 17 | 66.0% |
| Livonia, LA | 1,304 | 45 | 10.0% |
| Belfast, PA | 1,305 | 34 | 32.0% |
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