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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 30°F | 53°F | 40°F | 6.8" |
| February | 32°F | 57°F | 43°F | 4.7" |
| March | 39°F | 65°F | 51°F | 3.6" |
| April | 48°F | 74°F | 60°F | 7.9" |
| May | 55°F | 80°F | 67°F | 6.7" |
| June | 64°F | 88°F | 75°F | 3.6" |
| July | 68°F | 90°F | 78°F | 6.3" |
| August | 67°F | 88°F | 76°F | 6.8" |
| September | 61°F | 83°F | 70°F | 7.9" |
| October | 47°F | 73°F | 59°F | 7.6" |
| November | 36°F | 63°F | 48°F | 8.6" |
| December | 34°F | 56°F | 44°F | 8.6" |
| Index | Cornelius | 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. |
| Denver, NC | 2,964 | 36 | 28.0% |
| Westport, NC | 4,153 | 36 | 28.0% |
| Ranlo, NC | 3,643 | 36 | 28.0% |
| Stanley, NC | 3,734 | 36 | 28.0% |
| Lake Norman of Catawba, NC | 8,701 | 36 | 28.0% |
| Cornelius, NC | 29,836 | 49 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Oceanside, NY | 29,850 | 51 | 2.0% |
| Greenville, MS | 29,854 | 43 | 14.0% |
| Texarkana, AR | 29,864 | 39 | 22.0% |
| Chamblee, GA | 29,874 | 52 | 4.0% |
| Morristown, TN | 29,887 | 44 | 12.0% |
| Cornelius, NC | 29,836 | 49 | 2.0% |
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