| 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 | Swannanoa | North Carolina | National |
| Air quality index | 44 | 35 | 42 |
| Pollution index | 3,495,600 | 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 | 0.080% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.060% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| Fruitland, NC | 2,216 | 44 | 12.0% |
| Asheville, NC | 92,328 | 44 | 12.0% |
| Black Mountain, NC | 8,177 | 44 | 12.0% |
| Royal Pines, NC | 4,499 | 44 | 12.0% |
| Chimney Rock Village, NC | 174 | 44 | 12.0% |
| Swannanoa, NC | 4,360 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Nashville, AR | 4,359 | 39 | 22.0% |
| Rockmart, GA | 4,359 | 44 | 12.0% |
| Château-Richer, QC | 4,359 | n/a | |
| Captain Cook, HI | 4,361 | 16 | 68.0% |
| Holt, AL | 4,358 | 35 | 30.0% |
| Swannanoa, NC | 4,360 | 44 | 12.0% |
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