| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 44°F | 34°F | 4.3" |
| February | 27°F | 46°F | 35°F | 2.7" |
| March | 35°F | 58°F | 45°F | 4.2" |
| April | 43°F | 68°F | 55°F | 5.1" |
| May | 52°F | 74°F | 62°F | 4.8" |
| June | 59°F | 82°F | 70°F | 4.6" |
| July | 62°F | 83°F | 72°F | 7.0" |
| August | 62°F | 82°F | 71°F | 6.0" |
| September | 55°F | 77°F | 65°F | 5.5" |
| October | 44°F | 67°F | 54°F | 5.6" |
| November | 34°F | 57°F | 44°F | 3.8" |
| December | 30°F | 49°F | 38°F | 3.6" |
| Index | Marion | Virginia | National |
| Air quality index | 26 | 58 | 42 |
| Pollution index | 1,016,480 | 1,561,881 | 2,726,193 |
| Measurement | Total |
| Days measured | 122 |
| Days with good air quality | 109 |
| Days with moderate air quality | 12 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.040% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.040% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Seven Mile Ford, VA | 713 | 26 | 48.0% |
| Adwolf, VA | 1,771 | 26 | 48.0% |
| Sugar Grove, VA | 827 | 26 | 48.0% |
| Atkins, VA | 1,049 | 26 | 48.0% |
| Chilhowie, VA | 2,262 | 26 | 48.0% |
| Marion, VA | 5,646 | 26 | 48.0% |
| City | Population | Air Quality Index | National Avg. |
| Eaton, CO | 5,646 | 45 | 10.0% |
| Carlinville, IL | 5,645 | 40 | 20.0% |
| Solvang, CA | 5,644 | 44 | 12.0% |
| Malone, NY | 5,644 | 0 | 100.0% |
| Oliver, BC | 5,648 | n/a | |
| Marion, VA | 5,646 | 26 | 48.0% |
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