| 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 | Highlands | 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. |
| Dillard, GA | 328 | 41 | 18.0% |
| Glenville, NC | 99 | 41 | 18.0% |
| Clayton, GA | 1,837 | 41 | 18.0% |
| Sky Valley, GA | 666 | 41 | 18.0% |
| Salem, SC | 175 | 41 | 18.0% |
| Highlands, NC | 1,061 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Bluewater, AZ | 1,061 | 13 | 74.0% |
| Claypool, AZ | 1,061 | 60 | 20.0% |
| South Pekin, IL | 1,061 | 41 | 18.0% |
| Marion Center, MA | 1,061 | 36 | 28.0% |
| Surrey, ND | 1,061 | 36 | 28.0% |
| Highlands, NC | 1,061 | 41 | 18.0% |
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