| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 52°F | 40°F | 5.8" |
| February | 33°F | 53°F | 41°F | 5.5" |
| March | 39°F | 63°F | 50°F | 4.4" |
| April | 49°F | 75°F | 61°F | 6.7" |
| May | 58°F | 81°F | 69°F | 5.8" |
| June | 64°F | 89°F | 77°F | 7.1" |
| July | 69°F | 91°F | 79°F | 10.4" |
| August | 64°F | 90°F | 77°F | 6.0" |
| September | 61°F | 85°F | 72°F | 8.6" |
| October | 51°F | 75°F | 62°F | 7.3" |
| November | 40°F | 63°F | 50°F | 8.2" |
| December | 39°F | 61°F | 49°F | 7.8" |
| Index | Hamilton | North Carolina | National |
| Air quality index | 38 | 35 | 42 |
| Pollution index | 2,959,880 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 352 |
| Days with good air quality | 308 |
| Days with moderate air quality | 44 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Bear Grass, NC | 82 | 0 | 100.0% |
| Windsor, NC | 3,422 | 0 | 100.0% |
| Williamston, NC | 5,251 | 0 | 100.0% |
| Askewville, NC | 182 | 0 | 100.0% |
| Speed, NC | 83 | 36 | 28.0% |
| Hamilton, NC | 226 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Fredonia, AL | 226 | 42 | 16.0% |
| Keo, AR | 226 | 45 | 10.0% |
| Lynn, AR | 226 | 45 | 10.0% |
| Sierra Village, CA | 226 | 39 | 22.0% |
| Volga, IA | 226 | 39 | 22.0% |
| Hamilton, NC | 226 | 38 | 24.0% |
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