| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 30°F | 51°F | 40°F | 3.6" |
| February | 32°F | 54°F | 42°F | 2.5" |
| March | 40°F | 63°F | 51°F | 3.5" |
| April | 49°F | 73°F | 60°F | 4.3" |
| May | 57°F | 79°F | 67°F | 4.5" |
| June | 65°F | 86°F | 76°F | 4.0" |
| July | 69°F | 89°F | 78°F | 4.1" |
| August | 68°F | 87°F | 77°F | 4.8" |
| September | 62°F | 81°F | 71°F | 3.9" |
| October | 49°F | 72°F | 60°F | 3.8" |
| November | 39°F | 62°F | 50°F | 3.6" |
| December | 34°F | 54°F | 44°F | 3.8" |
| Index | Lewisville | North Carolina | National |
| Air quality index | 45 | 35 | 42 |
| Pollution index | 3,428,900 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 225 |
| Days with moderate air quality | 140 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| 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. |
| Mocksville, NC | 5,241 | 40 | 20.0% |
| Welcome, NC | 3,050 | 40 | 20.0% |
| Winston-Salem, NC | 245,787 | 45 | 10.0% |
| King, NC | 6,980 | 45 | 10.0% |
| Walkertown, NC | 5,166 | 45 | 10.0% |
| Lewisville, NC | 14,030 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Chicago Ridge, IL | 14,028 | 55 | 10.0% |
| Grand Falls-Windsor, NL | 14,032 | n/a | |
| Cahokia, IL | 14,035 | 54 | 8.0% |
| Artondale, WA | 14,024 | 18 | 64.0% |
| Gardendale, AL | 14,021 | 53 | 6.0% |
| Lewisville, NC | 14,030 | 45 | 10.0% |
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