| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 54°F | 43°F | 3.9" |
| February | 30°F | 53°F | 41°F | 5.2" |
| March | 37°F | 66°F | 51°F | 5.8" |
| April | 45°F | 72°F | 59°F | 6.7" |
| May | 53°F | 78°F | 65°F | 2.4" |
| June | 63°F | 86°F | 74°F | 6.5" |
| July | 68°F | 90°F | 78°F | 6.1" |
| August | 68°F | 93°F | 80°F | 4.9" |
| September | 61°F | 87°F | 73°F | 3.0" |
| October | 51°F | 76°F | 63°F | 9.8" |
| November | 37°F | 65°F | 50°F | 4.8" |
| December | 32°F | 55°F | 42°F | 6.3" |
| Index | Swepsonville | North Carolina | National |
| Air quality index | 31 | 35 | 42 |
| Pollution index | 16,424,300 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 356 |
| Days with good air quality | 313 |
| Days with moderate air quality | 43 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.130% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.030% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Graham, NC | 15,168 | 31 | 38.0% |
| Mebane, NC | 15,564 | 31 | 38.0% |
| Altamahaw, NC | 369 | 31 | 38.0% |
| Saxapahaw, NC | 1,340 | 31 | 38.0% |
| Elon, NC | 11,941 | 31 | 38.0% |
| Swepsonville, NC | 2,254 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Brewster, OH | 2,254 | 46 | 8.0% |
| Terrace Park, OH | 2,254 | 54 | 8.0% |
| Stephens City, VA | 2,254 | 38 | 24.0% |
| Aitkin, MN | 2,253 | 29 | 42.0% |
| Pymatuning Central, PA | 2,253 | 34 | 32.0% |
| Swepsonville, NC | 2,254 | 31 | 38.0% |
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