| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 45°F | 35°F | 4.9" |
| February | 27°F | 47°F | 36°F | 2.4" |
| March | 35°F | 58°F | 45°F | 3.4" |
| April | 43°F | 70°F | 56°F | 3.2" |
| May | 51°F | 77°F | 63°F | 6.1" |
| June | 60°F | 84°F | 71°F | 6.8" |
| July | 63°F | 87°F | 74°F | 8.1" |
| August | 62°F | 86°F | 73°F | 4.8" |
| September | 55°F | 80°F | 66°F | 6.1" |
| October | 45°F | 69°F | 55°F | 5.8" |
| November | 35°F | 57°F | 45°F | 1.9" |
| December | 30°F | 49°F | 38°F | 3.6" |
| Index | Keyser | West Virginia | National |
| Air quality index | 36 | 126 | 42 |
| Pollution index | 1,427,850 | 1,996,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 359 |
| Days with good air quality | 340 |
| Days with moderate air quality | 19 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Eckhart Mines, MD | 512 | 36 | 28.0% |
| Swanton, MD | 0 | 36 | 28.0% |
| Barton, MD | 510 | 36 | 28.0% |
| Franklin, MD | 157 | 36 | 28.0% |
| Midland, MD | 678 | 36 | 28.0% |
| Keyser, WV | 4,956 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Watseka, IL | 4,956 | 42 | 16.0% |
| West Sayville, NY | 4,956 | 43 | 14.0% |
| Barling, AR | 4,957 | 36 | 28.0% |
| Needles, CA | 4,959 | 13 | 74.0% |
| Perry, OK | 4,959 | 40 | 20.0% |
| Keyser, WV | 4,956 | 36 | 28.0% |
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