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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 42°F | 32°F | 3.2" |
| February | 25°F | 43°F | 33°F | 2.4" |
| March | 33°F | 55°F | 43°F | 3.9" |
| April | 43°F | 68°F | 55°F | 4.1" |
| May | 52°F | 75°F | 63°F | 4.3" |
| June | 60°F | 82°F | 71°F | 4.8" |
| July | 64°F | 85°F | 74°F | 6.0" |
| August | 63°F | 84°F | 73°F | 4.0" |
| September | 57°F | 79°F | 67°F | 3.2" |
| October | 46°F | 67°F | 56°F | 3.9" |
| November | 36°F | 57°F | 46°F | 2.7" |
| December | 29°F | 46°F | 37°F | 4.1" |
| Index | Farmington | Pennsylvania | National |
| Air quality index | 36 | 45 | 42 |
| Pollution index | 6,478,770 | 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 | 0.030% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.210% |
| City | Population | Air Quality Index | National Avg. |
| Confluence, PA | 597 | 36 | 28.0% |
| Chalkhill, PA | 69 | 36 | 28.0% |
| Connellsville, PA | 7,414 | 36 | 28.0% |
| Smock, PA | 579 | 36 | 28.0% |
| Leith-Hatfield, PA | 2,119 | 36 | 28.0% |
| Farmington, PA | 983 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Dunkerton, IA | 983 | 39 | 22.0% |
| Mechanicsville, IA | 983 | 39 | 22.0% |
| Summitville, IN | 983 | 35 | 30.0% |
| Millington, MI | 983 | 38 | 24.0% |
| Vaiden, MS | 983 | 33 | 34.0% |
| Farmington, PA | 983 | 36 | 28.0% |
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