| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 37°F | 28°F | 2.8" |
| February | 19°F | 39°F | 29°F | 2.5" |
| March | 27°F | 49°F | 37°F | 3.0" |
| April | 38°F | 64°F | 50°F | 3.3" |
| May | 48°F | 74°F | 60°F | 3.2" |
| June | 57°F | 81°F | 69°F | 4.2" |
| July | 61°F | 86°F | 73°F | 3.7" |
| August | 59°F | 83°F | 71°F | 4.0" |
| September | 53°F | 77°F | 64°F | 3.5" |
| October | 43°F | 65°F | 53°F | 4.9" |
| November | 33°F | 53°F | 43°F | 2.6" |
| December | 25°F | 42°F | 33°F | 3.3" |
| Index | Berwick | Pennsylvania | National |
| Air quality index | 38 | 45 | 42 |
| Pollution index | 1,279,530 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 329 |
| Days with moderate air quality | 36 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Almedia, PA | 1,108 | 35 | 30.0% |
| Fernville, PA | 364 | 35 | 30.0% |
| Mifflinville, PA | 922 | 35 | 30.0% |
| Benton, PA | 520 | 35 | 30.0% |
| Millville, PA | 959 | 35 | 30.0% |
| Berwick, PA | 10,003 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Galion, OH | 10,003 | 41 | 18.0% |
| Hampton, NH | 10,002 | 37 | 26.0% |
| Hinton, AB | 10,000 | n/a | |
| Clinton, TN | 10,006 | 46 | 8.0% |
| Ventnor City, NJ | 9,995 | 37 | 26.0% |
| Berwick, PA | 10,003 | 38 | 24.0% |
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