| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 30°F | 55°F | 42°F | 3.5" |
| February | 32°F | 58°F | 45°F | 2.9" |
| March | 39°F | 67°F | 53°F | 4.2" |
| April | 47°F | 76°F | 62°F | 3.9" |
| May | 56°F | 82°F | 69°F | 3.8" |
| June | 65°F | 89°F | 77°F | 4.2" |
| July | 68°F | 92°F | 79°F | 3.6" |
| August | 68°F | 91°F | 79°F | 4.2" |
| September | 62°F | 85°F | 73°F | 3.8" |
| October | 48°F | 76°F | 62°F | 3.0" |
| November | 37°F | 66°F | 51°F | 3.5" |
| December | 34°F | 58°F | 46°F | 4.7" |
| Index | Harbor House | Charlotte | North Carolina |
| Air quality index | 49 | 49 | 35 |
| Pollution index | 13,834,800 | 13,834,800 | 2,789,538 |
| 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. |
| Spencer Mountain, NC | 0 | 36 | 28.0% |
| Dallas, NC | 4,744 | 36 | 28.0% |
| Gastonia, NC | 76,635 | 36 | 28.0% |
| York, SC | 8,287 | 36 | 28.0% |
| Ranlo, NC | 3,643 | 36 | 28.0% |
| Charlotte, NC | 873,570 | 49 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| San Francisco, CA | 874,784 | 40 | 20.0% |
| Indianapolis, IN | 869,387 | 54 | 8.0% |
| Columbus, OH | 889,079 | 46 | 8.0% |
| Fort Worth, TX | 892,221 | 51 | 2.0% |
| Jacksonville, FL | 902,488 | 43 | 14.0% |
| Charlotte, NC | 873,570 | 49 | 2.0% |
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