| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 44°F | 35°F | 3.0" |
| February | 27°F | 46°F | 35°F | 2.1" |
| March | 36°F | 56°F | 45°F | 3.8" |
| April | 46°F | 68°F | 56°F | 4.4" |
| May | 53°F | 74°F | 63°F | 4.5" |
| June | 61°F | 81°F | 70°F | 3.9" |
| July | 64°F | 82°F | 72°F | 5.0" |
| August | 64°F | 82°F | 72°F | 3.7" |
| September | 57°F | 76°F | 66°F | 2.9" |
| October | 47°F | 67°F | 56°F | 3.3" |
| November | 37°F | 57°F | 46°F | 2.5" |
| December | 31°F | 48°F | 39°F | 3.6" |
| Index | Princeton | West Virginia | National |
| Air quality index | 295 | 126 | 42 |
| Pollution index | 1,493,700 | 1,996,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 120 |
| Days with good air quality | 106 |
| Days with moderate air quality | 14 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.005% |
| City | Population | Air Quality Index | National Avg. |
| Oakvale, WV | 201 | 41 | 18.0% |
| Glen Lyn, VA | 92 | 41 | 18.0% |
| Brush Fork, WV | 1,025 | 295 | 490.0% |
| Pocahontas, VA | 242 | 295 | 490.0% |
| Crumpler, WV | 224 | 295 | 490.0% |
| Princeton, WV | 5,740 | 295 | 490.0% |
| City | Population | Air Quality Index | National Avg. |
| Newtown Grant, PA | 5,740 | 41 | 18.0% |
| Newmarket, NH | 5,737 | 37 | 26.0% |
| Citrus Park, AZ | 5,744 | 74 | 48.0% |
| West Side Highway, WA | 5,735 | 18 | 64.0% |
| Schriever, LA | 5,734 | 41 | 18.0% |
| Princeton, WV | 5,740 | 295 | 490.0% |
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