| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 38°F | 28°F | 3.1" |
| February | 19°F | 40°F | 29°F | 2.4" |
| March | 28°F | 52°F | 39°F | 3.1" |
| April | 38°F | 66°F | 51°F | 3.8" |
| May | 48°F | 75°F | 61°F | 3.9" |
| June | 58°F | 83°F | 70°F | 4.1" |
| July | 62°F | 87°F | 74°F | 4.7" |
| August | 60°F | 84°F | 71°F | 5.3" |
| September | 54°F | 79°F | 65°F | 4.3" |
| October | 43°F | 66°F | 53°F | 4.9" |
| November | 32°F | 54°F | 42°F | 3.0" |
| December | 26°F | 43°F | 34°F | 4.0" |
| Index | Dewart | Pennsylvania | National |
| Air quality index | 35 | 45 | 42 |
| Pollution index | 3,637,020 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 361 |
| Days with good air quality | 340 |
| Days with moderate air quality | 21 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Washingtonville, PA | 155 | 35 | 30.0% |
| Milton, PA | 6,558 | 35 | 30.0% |
| Linntown, PA | 1,799 | 35 | 30.0% |
| Vicksburg, PA | 283 | 35 | 30.0% |
| Northumberland, PA | 3,732 | 35 | 30.0% |
| Dewart, PA | 1,298 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Enigma, GA | 1,298 | 26 | 48.0% |
| Newberry, MI | 1,298 | 32 | 36.0% |
| Larimore, ND | 1,298 | 33 | 34.0% |
| Black Rock, NM | 1,298 | 17 | 66.0% |
| Sidney, IL | 1,297 | 42 | 16.0% |
| Dewart, PA | 1,298 | 35 | 30.0% |
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