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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 41°F | 32°F | 2.2" |
| February | 25°F | 43°F | 34°F | 1.8" |
| March | 34°F | 55°F | 44°F | 2.3" |
| April | 44°F | 67°F | 55°F | 3.3" |
| May | 54°F | 76°F | 64°F | 3.9" |
| June | 63°F | 84°F | 73°F | 4.0" |
| July | 67°F | 88°F | 77°F | 3.3" |
| August | 65°F | 85°F | 75°F | 2.8" |
| September | 58°F | 79°F | 68°F | 3.2" |
| October | 48°F | 67°F | 57°F | 3.6" |
| November | 37°F | 55°F | 45°F | 2.1" |
| December | 30°F | 46°F | 37°F | 3.0" |
| Index | Fort Loudon | Pennsylvania | National |
| Air quality index | 36 | 45 | 42 |
| Pollution index | 16,230,700 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 341 |
| Days with good air quality | 324 |
| Days with moderate air quality | 17 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.130% |
| Carbon Tetrachloride | 0.090% |
| Lead | 0.080% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Marion, PA | 1,551 | 36 | 28.0% |
| Chambersburg, PA | 21,017 | 36 | 28.0% |
| Mercersburg, PA | 1,673 | 36 | 28.0% |
| McConnellsburg, PA | 1,030 | 36 | 28.0% |
| Needmore, PA | 92 | 36 | 28.0% |
| Fort Loudon, PA | 1,168 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Malaga, CA | 1,168 | 60 | 20.0% |
| Blue Ridge, GA | 1,168 | 43 | 14.0% |
| Pine Plains, NY | 1,168 | 36 | 28.0% |
| Asotin, WA | 1,168 | 29 | 42.0% |
| Boyceville, WI | 1,168 | 34 | 32.0% |
| Fort Loudon, PA | 1,168 | 36 | 28.0% |
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