| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 56°F | 45°F | 6.9" |
| February | 33°F | 55°F | 43°F | 4.8" |
| March | 41°F | 67°F | 53°F | 7.5" |
| April | 47°F | 73°F | 59°F | 5.2" |
| May | 54°F | 79°F | 67°F | 2.6" |
| June | 65°F | 86°F | 75°F | 10.3" |
| July | 69°F | 89°F | 78°F | 7.2" |
| August | 71°F | 93°F | 81°F | 5.1" |
| September | 63°F | 87°F | 74°F | 3.8" |
| October | 54°F | 76°F | 64°F | 10.6" |
| November | 39°F | 66°F | 52°F | 2.9" |
| December | 35°F | 57°F | 45°F | 7.2" |
| Index | Unionville | North Carolina | National |
| Air quality index | 49 | 35 | 42 |
| Pollution index | 13,834,800 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 200 |
| Days with moderate air quality | 147 |
| Days w/ poor A.Q. for sensitive groups | 18 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.170% |
| Carbon Tetrachloride | 0.050% |
| Lead | 0.030% |
| Mercury | 0.100% |
| City | Population | Air Quality Index | National Avg. |
| JAARS, NC | 1,090 | 49 | 2.0% |
| Locust, NC | 3,439 | 49 | 2.0% |
| Monroe, NC | 35,339 | 49 | 2.0% |
| Stanfield, NC | 1,421 | 49 | 2.0% |
| Matthews, NC | 32,682 | 49 | 2.0% |
| Unionville, NC | 7,089 | 49 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| East Shoreham, NY | 7,090 | 43 | 14.0% |
| Cottage Grove, WI | 7,086 | 39 | 22.0% |
| Huron, CA | 7,084 | 56 | 12.0% |
| Rockville, CT | 7,084 | 41 | 18.0% |
| Glenolden, PA | 7,094 | 51 | 2.0% |
| Unionville, NC | 7,089 | 49 | 2.0% |
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