| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 51°F | 37°F | 4.0" |
| February | 28°F | 54°F | 39°F | 2.8" |
| March | 35°F | 62°F | 48°F | 3.6" |
| April | 43°F | 72°F | 57°F | 4.3" |
| May | 51°F | 77°F | 64°F | 3.9" |
| June | 60°F | 84°F | 71°F | 4.7" |
| July | 63°F | 85°F | 73°F | 5.3" |
| August | 63°F | 85°F | 73°F | 5.0" |
| September | 57°F | 80°F | 67°F | 4.6" |
| October | 44°F | 71°F | 56°F | 4.0" |
| November | 34°F | 61°F | 46°F | 3.6" |
| December | 31°F | 54°F | 41°F | 5.3" |
| Index | Mars Hill | North Carolina | National |
| Air quality index | 44 | 35 | 42 |
| Pollution index | 457,681 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 285 |
| Days with moderate air quality | 78 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Montreat, NC | 369 | 44 | 12.0% |
| Woodfin, NC | 6,849 | 44 | 12.0% |
| Weaverville, NC | 4,102 | 44 | 12.0% |
| Marshall, NC | 674 | 44 | 12.0% |
| Black Mountain, NC | 8,481 | 44 | 12.0% |
| Mars Hill, NC | 3,152 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Mount Morris, NY | 3,152 | 37 | 26.0% |
| Rankin Inlet, NU | 3,151 | n/a | |
| Haynesville, LA | 3,153 | 35 | 30.0% |
| Point Baker, FL | 3,150 | 41 | 18.0% |
| Barbourville, KY | 3,154 | 39 | 22.0% |
| Mars Hill, NC | 3,152 | 44 | 12.0% |