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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 38°F | 30°F | 3.2" |
| February | 23°F | 39°F | 30°F | 2.2" |
| March | 32°F | 52°F | 41°F | 3.4" |
| April | 43°F | 65°F | 53°F | 3.4" |
| May | 52°F | 74°F | 62°F | 4.2" |
| June | 60°F | 81°F | 70°F | 5.1" |
| July | 64°F | 84°F | 73°F | 5.1" |
| August | 63°F | 82°F | 72°F | 4.1" |
| September | 56°F | 77°F | 66°F | 3.1" |
| October | 46°F | 65°F | 54°F | 3.8" |
| November | 35°F | 54°F | 44°F | 2.8" |
| December | 28°F | 43°F | 35°F | 3.7" |
| Index | Grindstone | 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. |
| Deemston, PA | 702 | 36 | 28.0% |
| Millsboro, PA | 503 | 36 | 28.0% |
| East Uniontown, PA | 2,231 | 36 | 28.0% |
| Leith-Hatfield, PA | 2,119 | 36 | 28.0% |
| South Uniontown, PA | 1,231 | 36 | 28.0% |
| Grindstone, PA | 818 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Maricopa Colony, AZ | 818 | 74 | 48.0% |
| Alto, CA | 818 | 40 | 20.0% |
| Enterprise, KS | 818 | 32 | 36.0% |
| Village of Clarkston, MI | 818 | 38 | 24.0% |
| Woodridge, NY | 818 | 36 | 28.0% |
| Grindstone, PA | 818 | 36 | 28.0% |
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