| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 52°F | 40°F | 4.1" |
| February | 31°F | 53°F | 41°F | 2.8" |
| March | 40°F | 63°F | 51°F | 4.2" |
| April | 48°F | 72°F | 60°F | 3.2" |
| May | 55°F | 78°F | 66°F | 2.9" |
| June | 65°F | 87°F | 75°F | 3.2" |
| July | 67°F | 88°F | 77°F | 4.3" |
| August | 68°F | 89°F | 77°F | 5.4" |
| September | 61°F | 81°F | 70°F | 5.1" |
| October | 50°F | 71°F | 59°F | 4.4" |
| November | 39°F | 62°F | 50°F | 4.1" |
| December | 33°F | 53°F | 42°F | 5.1" |
| Index | Bethlehem | North Carolina | National |
| Air quality index | 43 | 35 | 42 |
| Pollution index | 1,564,530 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 275 |
| Days with moderate air quality | 90 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Claremont, NC | 1,924 | 43 | 14.0% |
| Long View, NC | 4,898 | 43 | 14.0% |
| Hickory, NC | 41,067 | 43 | 14.0% |
| Cajah's Mountain, NC | 2,758 | 43 | 14.0% |
| Sawmills, NC | 5,201 | 43 | 14.0% |
| Bethlehem, NC | 3,959 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Freedom, CA | 3,959 | 35 | 30.0% |
| Plains, PA | 3,958 | 38 | 24.0% |
| White City, SK | 3,960 | n/a | |
| Lake San Marcos, CA | 3,957 | 64 | 28.0% |
| Southgate, KY | 3,957 | 54 | 8.0% |
| Bethlehem, NC | 3,959 | 43 | 14.0% |
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