| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 43°F | 30°F | 3.2" |
| February | 20°F | 44°F | 31°F | 2.5" |
| March | 29°F | 56°F | 41°F | 4.0" |
| April | 37°F | 68°F | 52°F | 4.6" |
| May | 46°F | 74°F | 59°F | 4.8" |
| June | 55°F | 81°F | 67°F | 4.8" |
| July | 59°F | 83°F | 70°F | 6.2" |
| August | 58°F | 83°F | 69°F | 4.2" |
| September | 51°F | 78°F | 63°F | 3.3" |
| October | 40°F | 67°F | 52°F | 4.1" |
| November | 29°F | 57°F | 41°F | 2.8" |
| December | 24°F | 47°F | 35°F | 4.4" |
| Index | Mill Creek | West Virginia | National |
| Air quality index | 31 | 126 | 42 |
| Pollution index | 968,752 | 1,996,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 111 |
| Days with good air quality | 101 |
| Days with moderate air quality | 10 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Bowden, WV | 0 | 31 | 38.0% |
| Beverly, WV | 706 | 31 | 38.0% |
| Helvetia, WV | 84 | 31 | 38.0% |
| Elkins, WV | 7,017 | 31 | 38.0% |
| Dailey, WV | 39 | 31 | 38.0% |
| Mill Creek, WV | 843 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Roland, AR | 843 | 45 | 10.0% |
| McClellan Park, CA | 843 | 52 | 4.0% |
| Hopkins, MI | 843 | 39 | 22.0% |
| Innsbrook, MO | 843 | 54 | 8.0% |
| Burnsville, MS | 843 | 37 | 26.0% |
| Mill Creek, WV | 843 | 31 | 38.0% |
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