| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 30°F | 51°F | 40°F | 6.4" |
| February | 31°F | 55°F | 42°F | 3.6" |
| March | 39°F | 64°F | 51°F | 4.8" |
| April | 47°F | 73°F | 59°F | 7.7" |
| May | 55°F | 79°F | 66°F | 8.6" |
| June | 64°F | 86°F | 74°F | 5.4" |
| July | 67°F | 88°F | 76°F | 7.5" |
| August | 67°F | 87°F | 75°F | 7.7" |
| September | 60°F | 81°F | 69°F | 5.5" |
| October | 48°F | 71°F | 59°F | 7.1" |
| November | 38°F | 61°F | 49°F | 9.1" |
| December | 34°F | 54°F | 43°F | 7.5" |
| Index | Harmony | North Carolina | National |
| Air quality index | 40 | 35 | 42 |
| Pollution index | 3,428,900 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 292 |
| Days with moderate air quality | 73 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.005% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Statesville, NC | 27,114 | 40 | 20.0% |
| Mocksville, NC | 5,241 | 40 | 20.0% |
| Cooleemee, NC | 1,028 | 40 | 20.0% |
| Love Valley, NC | 118 | 43 | 14.0% |
| Yadkinville, NC | 2,892 | 45 | 10.0% |
| Harmony, NC | 525 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Elma, IA | 525 | 15 | 70.0% |
| Como, IL | 525 | 42 | 16.0% |
| Painted Hills, IN | 525 | 42 | 16.0% |
| Deerfield, MA | 525 | 40 | 20.0% |
| Carp Lake, MI | 525 | 32 | 36.0% |
| Harmony, NC | 525 | 40 | 20.0% |
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