| 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 | Marshall | North Carolina | National |
| Air quality index | 44 | 35 | 42 |
| Pollution index | 20,443,500 | 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 | 0.010% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.050% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Hot Springs, NC | 530 | 44 | 12.0% |
| Weaverville, NC | 3,956 | 44 | 12.0% |
| Woodfin, NC | 6,689 | 44 | 12.0% |
| Mars Hill, NC | 3,035 | 44 | 12.0% |
| Marshall, NC | 658 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Ona, FL | 658 | 36 | 28.0% |
| Melba, ID | 658 | 36 | 28.0% |
| Marengo, IN | 658 | 6 | 88.0% |
| Russell, MA | 658 | 40 | 20.0% |
| Lyons, OH | 658 | 39 | 22.0% |
| Marshall, NC | 658 | 44 | 12.0% |
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