| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 54°F | 43°F | 4.8" |
| February | 35°F | 57°F | 45°F | 4.5" |
| March | 42°F | 66°F | 53°F | 4.6" |
| April | 52°F | 76°F | 63°F | 7.5" |
| May | 60°F | 82°F | 70°F | 8.3" |
| June | 69°F | 90°F | 78°F | 7.3" |
| July | 72°F | 92°F | 80°F | 9.8" |
| August | 71°F | 90°F | 79°F | 6.0" |
| September | 65°F | 84°F | 73°F | 10.4" |
| October | 53°F | 75°F | 62°F | 8.3" |
| November | 41°F | 64°F | 51°F | 6.7" |
| December | 38°F | 58°F | 47°F | 8.0" |
| Index | Erwin | North Carolina | National |
| Air quality index | 41 | 35 | 42 |
| Pollution index | 2,919,900 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 282 |
| Days with moderate air quality | 81 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Mamers, NC | 613 | 29 | 42.0% |
| Buies Creek, NC | 3,388 | 29 | 42.0% |
| Lillington, NC | 3,605 | 29 | 42.0% |
| Four Oaks, NC | 2,225 | 40 | 20.0% |
| Wade, NC | 605 | 41 | 18.0% |
| Erwin, NC | 5,104 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Walnut Ridge, AR | 5,104 | 45 | 10.0% |
| Fox Chapel, PA | 5,104 | 56 | 12.0% |
| Hearst, ON | 5,104 | n/a | |
| Neepawa, MB | 5,104 | n/a | |
| Shediac, NB | 5,103 | n/a | |
| Erwin, NC | 5,104 | 41 | 18.0% |
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