| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 57°F | 46°F | 8.0" |
| February | 33°F | 57°F | 44°F | 5.0" |
| March | 42°F | 69°F | 54°F | 10.6" |
| April | 47°F | 74°F | 61°F | 7.3" |
| May | 55°F | 81°F | 68°F | 2.9" |
| June | 66°F | 87°F | 76°F | 9.4" |
| July | 69°F | 89°F | 78°F | 4.1" |
| August | 71°F | 95°F | 82°F | 2.2" |
| September | 64°F | 89°F | 75°F | 4.7" |
| October | 55°F | 77°F | 65°F | 9.5" |
| November | 40°F | 67°F | 52°F | 5.7" |
| December | 35°F | 58°F | 45°F | 7.4" |
| Index | Spencer Mountain | North Carolina | National |
| Air quality index | 36 | 35 | 42 |
| Pollution index | 13,834,800 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 214 |
| Days with good air quality | 205 |
| Days with moderate air quality | 9 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.170% |
| Carbon Tetrachloride | 0.050% |
| Lead | 0.030% |
| Mercury | 0.100% |
| City | Population | Air Quality Index | National Avg. |
| High Shoals, NC | 841 | 36 | 28.0% |
| Ranlo, NC | 3,643 | 36 | 28.0% |
| Bessemer City, NC | 5,536 | 36 | 28.0% |
| Cherryville, NC | 6,018 | 36 | 28.0% |
| Iron Station, NC | 539 | 36 | 28.0% |
| Spencer Mountain, NC | 0 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Chase, AK | 0 | 31 | 38.0% |
| Chiniak, AK | 0 | 31 | 38.0% |
| Chisana, AK | 0 | 31 | 38.0% |
| Dot Lake, AK | 0 | 38 | 24.0% |
| Eureka Roadhouse, AK | 0 | 31 | 38.0% |
| Spencer Mountain, NC | 0 | 36 | 28.0% |
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