| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 42°F | 32°F | 3.2" |
| February | 24°F | 43°F | 33°F | 2.5" |
| March | 34°F | 56°F | 44°F | 3.9" |
| April | 43°F | 68°F | 55°F | 4.1" |
| May | 51°F | 75°F | 63°F | 4.1" |
| June | 59°F | 82°F | 70°F | 5.3" |
| July | 63°F | 84°F | 73°F | 6.0" |
| August | 61°F | 84°F | 72°F | 3.6" |
| September | 55°F | 78°F | 66°F | 3.5" |
| October | 44°F | 67°F | 55°F | 3.6" |
| November | 34°F | 56°F | 44°F | 2.3" |
| December | 29°F | 47°F | 37°F | 4.2" |
| Index | Clarksburg | West Virginia | National |
| Air quality index | 31 | 126 | 42 |
| Pollution index | 323,222 | 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 | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| West Milford, WV | 544 | 31 | 38.0% |
| Anmoore, WV | 702 | 31 | 38.0% |
| Salem, WV | 1,862 | 31 | 38.0% |
| Fairmont, WV | 18,443 | 31 | 38.0% |
| Monongah, WV | 1,088 | 31 | 38.0% |
| Clarksburg, WV | 15,743 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Longmeadow, MA | 15,736 | 40 | 20.0% |
| Pataskala, OH | 15,751 | 46 | 8.0% |
| Isla Vista, CA | 15,733 | 44 | 12.0% |
| Warsaw, IN | 15,757 | 37 | 26.0% |
| Kenora, ON | 15,728 | n/a | |
| Clarksburg, WV | 15,743 | 31 | 38.0% |
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