| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 43°F | 33°F | 2.3" |
| February | 25°F | 45°F | 34°F | 1.7" |
| March | 33°F | 56°F | 43°F | 2.9" |
| April | 42°F | 68°F | 55°F | 3.7" |
| May | 51°F | 76°F | 63°F | 4.5" |
| June | 60°F | 84°F | 72°F | 3.9" |
| July | 64°F | 88°F | 76°F | 3.3" |
| August | 62°F | 86°F | 74°F | 3.1" |
| September | 56°F | 80°F | 67°F | 3.3" |
| October | 45°F | 68°F | 56°F | 4.2" |
| November | 35°F | 57°F | 45°F | 2.4" |
| December | 28°F | 47°F | 37°F | 3.2" |
| Index | Martinsburg | West Virginia | National |
| Air quality index | 40 | 126 | 42 |
| Pollution index | 314,680 | 1,996,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 362 |
| Days with good air quality | 306 |
| Days with moderate air quality | 54 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Inwood, WV | 2,700 | 38 | 24.0% |
| Middleway, WV | 396 | 38 | 24.0% |
| Ranson, WV | 5,217 | 38 | 24.0% |
| Charles Town, WV | 5,985 | 38 | 24.0% |
| Sandy Hook, MD | 193 | 40 | 20.0% |
| Martinsburg, WV | 17,517 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Anoka, MN | 17,512 | 46 | 8.0% |
| Hermiston, OR | 17,512 | 38 | 24.0% |
| South Houston, TX | 17,522 | 52 | 4.0% |
| Kingsland, GA | 17,523 | 36 | 28.0% |
| Wailuku, HI | 17,523 | 15 | 70.0% |
| Martinsburg, WV | 17,517 | 40 | 20.0% |
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