| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 30°F | 53°F | 41°F | 5.0" |
| February | 32°F | 56°F | 43°F | 3.9" |
| March | 39°F | 65°F | 51°F | 5.2" |
| April | 47°F | 75°F | 60°F | 6.7" |
| May | 56°F | 80°F | 68°F | 5.4" |
| June | 64°F | 88°F | 76°F | 9.1" |
| July | 68°F | 90°F | 78°F | 5.9" |
| August | 68°F | 89°F | 77°F | 9.7" |
| September | 61°F | 83°F | 71°F | 8.7" |
| October | 48°F | 73°F | 59°F | 8.8" |
| November | 37°F | 63°F | 49°F | 6.5" |
| December | 35°F | 57°F | 44°F | 6.2" |
| Index | Siler City | North Carolina | National |
| Air quality index | 29 | 35 | 42 |
| Pollution index | 2,015,140 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 57 |
| Days with good air quality | 57 |
| Days with moderate air quality | |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.000% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Goldston, NC | 392 | 29 | 42.0% |
| Gulf, NC | 0 | 29 | 42.0% |
| Bennett, NC | 355 | 29 | 42.0% |
| Liberty, NC | 2,657 | 31 | 38.0% |
| Staley, NC | 347 | 31 | 38.0% |
| Siler City, NC | 8,159 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| Thousand Palms, CA | 8,158 | 89 | 78.0% |
| Dayton, NJ | 8,158 | 41 | 18.0% |
| Congers, NY | 8,158 | 51 | 2.0% |
| Lewistown, PA | 8,157 | 44 | 12.0% |
| Golden Valley, AZ | 8,161 | 13 | 74.0% |
| Siler City, NC | 8,159 | 29 | 42.0% |
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