| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 38°F | 29°F | 4.4" |
| February | 21°F | 40°F | 30°F | 3.5" |
| March | 30°F | 52°F | 40°F | 5.0" |
| April | 40°F | 64°F | 51°F | 4.5" |
| May | 49°F | 72°F | 60°F | 6.0" |
| June | 57°F | 79°F | 68°F | 8.6" |
| July | 61°F | 82°F | 71°F | 9.8" |
| August | 59°F | 81°F | 69°F | 6.1" |
| September | 53°F | 76°F | 63°F | 6.0" |
| October | 42°F | 64°F | 52°F | 4.2" |
| November | 32°F | 54°F | 42°F | 3.7" |
| December | 26°F | 43°F | 34°F | 4.5" |
| Index | Clarksville | Pennsylvania | National |
| Air quality index | 36 | 45 | 42 |
| Pollution index | 889,808 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 337 |
| Days with moderate air quality | 27 |
| 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 | 0.030% |
| Mercury | 0.030% |
| City | Population | Air Quality Index | National Avg. |
| Buffington, PA | 89 | 36 | 28.0% |
| Republic, PA | 1,194 | 36 | 28.0% |
| Smithfield, PA | 981 | 36 | 28.0% |
| Brownsville, PA | 2,313 | 36 | 28.0% |
| Fredericktown, PA | 200 | 36 | 28.0% |
| Clarksville, PA | 199 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Macedonia, AL | 199 | 35 | 30.0% |
| Pleasant Plains, AR | 199 | 45 | 10.0% |
| Southern Ute, CO | 199 | 44 | 12.0% |
| Soldier, IA | 199 | 35 | 30.0% |
| Cave-In-Rock, IL | 199 | 44 | 12.0% |
| Clarksville, PA | 199 | 36 | 28.0% |
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