| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 43°F | 34°F | 8.8" |
| February | 28°F | 45°F | 36°F | 4.2" |
| March | 36°F | 55°F | 44°F | 4.0" |
| April | 45°F | 64°F | 54°F | 5.8" |
| May | 52°F | 70°F | 61°F | 7.3" |
| June | 60°F | 78°F | 69°F | 6.0" |
| July | 62°F | 79°F | 70°F | 7.5" |
| August | 61°F | 77°F | 69°F | 5.1" |
| September | 56°F | 72°F | 63°F | 11.0" |
| October | 46°F | 63°F | 54°F | 12.0" |
| November | 36°F | 54°F | 44°F | 6.3" |
| December | 32°F | 48°F | 39°F | 4.6" |
| Index | Sparta | North Carolina | National |
| Air quality index | 26 | 35 | 42 |
| Pollution index | 1,016,480 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 122 |
| Days with good air quality | 109 |
| Days with moderate air quality | 12 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.040% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.040% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Independence, VA | 1,101 | 26 | 48.0% |
| Fries, VA | 499 | 41 | 18.0% |
| Galax, VA | 6,402 | 41 | 18.0% |
| Lowgap, NC | 246 | 45 | 10.0% |
| Sparta, NC | 1,878 | 26 | 48.0% |
| City | Population | Air Quality Index | National Avg. |
| Durant, IA | 1,878 | 32 | 36.0% |
| Logansport, LA | 1,878 | 39 | 22.0% |
| Choteau, MT | 1,878 | 21 | 58.0% |
| Shavertown, PA | 1,878 | 38 | 24.0% |
| Kersey, CO | 1,879 | 45 | 10.0% |
| Sparta, NC | 1,878 | 26 | 48.0% |
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