| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 53°F | 42°F | 6.3" |
| February | 33°F | 55°F | 43°F | 5.4" |
| March | 40°F | 63°F | 51°F | 5.9" |
| April | 49°F | 73°F | 60°F | 9.5" |
| May | 57°F | 78°F | 67°F | 5.9" |
| June | 65°F | 86°F | 75°F | 8.2" |
| July | 70°F | 89°F | 78°F | 8.0" |
| August | 68°F | 87°F | 77°F | 7.9" |
| September | 63°F | 81°F | 71°F | 9.9" |
| October | 51°F | 73°F | 61°F | 11.2" |
| November | 40°F | 62°F | 50°F | 5.6" |
| December | 36°F | 56°F | 45°F | 7.7" |
| Index | Harrellsville | North Carolina | National |
| Air quality index | 0 | 35 | 42 |
| Pollution index | 1,867,130 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 352 |
| Days with good air quality | 352 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.010% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Cofield, NC | 421 | 0 | 100.0% |
| Colerain, NC | 270 | 0 | 100.0% |
| Powellsville, NC | 247 | 0 | 100.0% |
| Askewville, NC | 182 | 0 | 100.0% |
| Ahoskie, NC | 4,819 | 0 | 100.0% |
| Harrellsville, NC | 177 | 0 | 100.0% |
| City | Population | Air Quality Index | National Avg. |
| Linn Grove, IA | 177 | 35 | 30.0% |
| Woden, IA | 177 | 15 | 70.0% |
| Gaylord, KS | 177 | 19 | 62.0% |
| Prospect, LA | 177 | 30 | 40.0% |
| Bay View, MI | 177 | 36 | 28.0% |
| Harrellsville, NC | 177 | 0 | 100.0% |
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