| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 32°F | 24°F | 2.7" |
| February | 16°F | 34°F | 24°F | 2.5" |
| March | 23°F | 44°F | 33°F | 3.3" |
| April | 35°F | 59°F | 46°F | 4.0" |
| May | 46°F | 69°F | 57°F | 3.7" |
| June | 55°F | 77°F | 65°F | 5.5" |
| July | 59°F | 81°F | 70°F | 4.5" |
| August | 58°F | 79°F | 67°F | 5.3" |
| September | 51°F | 73°F | 61°F | 3.9" |
| October | 41°F | 61°F | 50°F | 5.0" |
| November | 31°F | 49°F | 39°F | 3.2" |
| December | 22°F | 37°F | 29°F | 3.3" |
| Index | Friendsville | Pennsylvania | National |
| Air quality index | 36 | 45 | 42 |
| Pollution index | 1,248,250 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 352 |
| Days with good air quality | 314 |
| Days with moderate air quality | 38 |
| 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 | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Endicott, NY | 12,684 | 36 | 28.0% |
| Little Meadows, PA | 165 | 36 | 28.0% |
| Rome, PA | 491 | 36 | 28.0% |
| Apalachin, NY | 2,148 | 36 | 28.0% |
| Endwell, NY | 11,396 | 36 | 28.0% |
| Friendsville, PA | 118 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Chalkyitsik, AK | 118 | 38 | 24.0% |
| Delta, AL | 118 | 38 | 24.0% |
| Reed, AR | 118 | 43 | 14.0% |
| Katherine, AZ | 118 | 13 | 74.0% |
| Montgomery Creek, CA | 118 | 42 | 16.0% |
| Friendsville, PA | 118 | 36 | 28.0% |
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