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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 34°F | 25°F | 2.6" |
| February | 18°F | 35°F | 25°F | 2.2" |
| March | 27°F | 48°F | 37°F | 3.2" |
| April | 37°F | 62°F | 49°F | 3.5" |
| May | 47°F | 72°F | 59°F | 3.9" |
| June | 55°F | 78°F | 66°F | 5.3" |
| July | 59°F | 83°F | 70°F | 3.8" |
| August | 57°F | 81°F | 68°F | 4.0" |
| September | 51°F | 74°F | 61°F | 3.3" |
| October | 41°F | 63°F | 51°F | 3.9" |
| November | 31°F | 51°F | 40°F | 2.5" |
| December | 24°F | 39°F | 31°F | 3.7" |
| Index | Grassflat | Pennsylvania | National |
| Air quality index | 44 | 45 | 42 |
| Pollution index | 2,854,150 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 267 |
| Days with moderate air quality | 98 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Bigler, PA | 281 | 33 | 34.0% |
| Houtzdale, PA | 777 | 41 | 18.0% |
| Brisbin, PA | 323 | 41 | 18.0% |
| Snow Shoe, PA | 795 | 44 | 12.0% |
| West Decatur, PA | 502 | 44 | 12.0% |
| Grassflat, PA | 601 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Delleker, CA | 601 | 44 | 12.0% |
| Collbran, CO | 601 | 44 | 12.0% |
| Lake Mystic, FL | 601 | 38 | 24.0% |
| Leslie, GA | 601 | 39 | 22.0% |
| Balaton, MN | 601 | 32 | 36.0% |
| Grassflat, PA | 601 | 44 | 12.0% |
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