| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 50°F | 37°F | 9.0" |
| February | 29°F | 53°F | 39°F | 5.8" |
| March | 36°F | 63°F | 48°F | 4.9" |
| April | 43°F | 71°F | 56°F | 6.5" |
| May | 51°F | 77°F | 63°F | 6.9" |
| June | 60°F | 84°F | 70°F | 4.6" |
| July | 63°F | 85°F | 72°F | 4.5" |
| August | 63°F | 84°F | 71°F | 3.5" |
| September | 57°F | 79°F | 65°F | 5.5" |
| October | 44°F | 70°F | 54°F | 4.5" |
| November | 33°F | 61°F | 45°F | 7.8" |
| December | 32°F | 54°F | 41°F | 8.5" |
| Index | Glenville | North Carolina | National |
| Air quality index | 41 | 35 | 42 |
| Pollution index | 724,126 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 308 |
| Days with moderate air quality | 56 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.004% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Cashiers, NC | 728 | 41 | 18.0% |
| Franklin, NC | 4,030 | 41 | 18.0% |
| Highlands, NC | 1,061 | 41 | 18.0% |
| Dillard, GA | 328 | 41 | 18.0% |
| Sky Valley, GA | 666 | 41 | 18.0% |
| Glenville, NC | 99 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Cullomburg, AL | 99 | 36 | 28.0% |
| Faunsdale, AL | 99 | 35 | 30.0% |
| Black Springs, AR | 99 | 38 | 24.0% |
| Tumacacori-Carmen, AZ | 99 | 31 | 38.0% |
| Alleghany, CA | 99 | 44 | 12.0% |
| Glenville, NC | 99 | 41 | 18.0% |
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