| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 33°F | 25°F | 2.8" |
| February | 18°F | 34°F | 25°F | 2.2" |
| March | 27°F | 46°F | 35°F | 3.3" |
| April | 38°F | 61°F | 48°F | 3.6" |
| May | 47°F | 70°F | 58°F | 4.0" |
| June | 56°F | 77°F | 66°F | 5.4" |
| July | 59°F | 81°F | 70°F | 4.1" |
| August | 58°F | 79°F | 68°F | 4.3" |
| September | 52°F | 73°F | 62°F | 3.5" |
| October | 42°F | 61°F | 51°F | 4.2" |
| November | 32°F | 50°F | 40°F | 3.2" |
| December | 24°F | 38°F | 30°F | 3.6" |
| Index | Clarion | Pennsylvania | National |
| Air quality index | 33 | 45 | 42 |
| Pollution index | 601,986 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 359 |
| Days with good air quality | 357 |
| Days with moderate air quality | 2 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Vowinckel, PA | 68 | 9 | 82.0% |
| Crown, PA | 229 | 9 | 82.0% |
| Tylersburg, PA | 99 | 9 | 82.0% |
| St. Petersburg, PA | 259 | 31 | 38.0% |
| Knox, PA | 1,008 | 33 | 34.0% |
| Clarion, PA | 5,650 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| North Windham, ME | 5,651 | 40 | 20.0% |
| Columbia Falls, MT | 5,651 | 37 | 26.0% |
| Oliver, BC | 5,648 | n/a | |
| Covington, VA | 5,653 | 38 | 24.0% |
| Eaton, CO | 5,646 | 45 | 10.0% |
| Clarion, PA | 5,650 | 33 | 34.0% |
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