| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 36°F | 26°F | 2.9" |
| February | 17°F | 38°F | 27°F | 2.5" |
| March | 27°F | 48°F | 36°F | 3.2" |
| April | 38°F | 65°F | 51°F | 4.6" |
| May | 47°F | 74°F | 61°F | 3.5" |
| June | 56°F | 82°F | 68°F | 7.2" |
| July | 59°F | 84°F | 71°F | 4.6" |
| August | 57°F | 84°F | 70°F | 5.3" |
| September | 52°F | 78°F | 64°F | 5.4" |
| October | 44°F | 68°F | 54°F | 4.5" |
| November | 31°F | 53°F | 41°F | 3.1" |
| December | 26°F | 44°F | 35°F | 4.0" |
| Index | Grove City | 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. |
| West Sunbury, PA | 242 | 31 | 38.0% |
| Unionville borough, PA | 232 | 31 | 38.0% |
| Clintonville, PA | 540 | 31 | 38.0% |
| New Wilmington, PA | 2,196 | 31 | 38.0% |
| Stoneboro, PA | 752 | 31 | 38.0% |
| Grove City, PA | 7,829 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Southgate, ON | 7,828 | n/a | |
| Blair, NE | 7,830 | 40 | 20.0% |
| Hitchcock, TX | 7,831 | 52 | 4.0% |
| Raritan, NJ | 7,833 | 41 | 18.0% |
| Centerville, GA | 7,821 | 38 | 24.0% |
| Grove City, PA | 7,829 | 31 | 38.0% |
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