| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 33°F | 26°F | 4.0" |
| February | 18°F | 34°F | 26°F | 3.9" |
| March | 28°F | 45°F | 35°F | 4.3" |
| April | 38°F | 60°F | 48°F | 5.1" |
| May | 48°F | 70°F | 58°F | 5.4" |
| June | 56°F | 77°F | 66°F | 6.8" |
| July | 60°F | 81°F | 70°F | 7.9" |
| August | 59°F | 79°F | 68°F | 7.0" |
| September | 53°F | 73°F | 62°F | 5.2" |
| October | 43°F | 61°F | 51°F | 4.8" |
| November | 33°F | 49°F | 40°F | 3.8" |
| December | 25°F | 37°F | 30°F | 3.4" |
| Index | Harrisville | Pennsylvania | National |
| Air quality index | 31 | 45 | 42 |
| Pollution index | 601,986 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 361 |
| Days with good air quality | 356 |
| Days with moderate air quality | 5 |
| 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. |
| Chicora, PA | 1,046 | 31 | 38.0% |
| Portersville, PA | 262 | 31 | 38.0% |
| Grove City, PA | 7,829 | 31 | 38.0% |
| Slippery Rock University, PA | 2,503 | 31 | 38.0% |
| Sandy Lake, PA | 777 | 31 | 38.0% |
| Harrisville, PA | 969 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Bow Mar, CO | 969 | 58 | 16.0% |
| Buffalo Center, IA | 969 | 15 | 70.0% |
| Watterson Park, KY | 969 | 49 | 2.0% |
| Audubon Park, NJ | 969 | 51 | 2.0% |
| Gordon, PA | 969 | 42 | 16.0% |
| Harrisville, PA | 969 | 31 | 38.0% |
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