| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 55°F | 43°F | 12.0" |
| February | 36°F | 59°F | 47°F | 9.4" |
| March | 45°F | 69°F | 56°F | 9.0" |
| April | 52°F | 77°F | 64°F | 11.6" |
| May | 60°F | 83°F | 71°F | 8.6" |
| June | 68°F | 90°F | 79°F | 7.9" |
| July | 71°F | 92°F | 80°F | 7.8" |
| August | 71°F | 92°F | 80°F | 8.8" |
| September | 64°F | 87°F | 74°F | 8.5" |
| October | 51°F | 77°F | 63°F | 13.4" |
| November | 41°F | 66°F | 52°F | 8.1" |
| December | 37°F | 58°F | 47°F | 10.8" |
| Index | Hamilton | Mississippi | National |
| Air quality index | 39 | 40 | 42 |
| Pollution index | 3,429,900 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 241 |
| Days with good air quality | 222 |
| Days with moderate air quality | 19 |
| 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 | 0.060% |
| Lead | 0.030% |
| Mercury | 0.110% |
| City | Population | Air Quality Index | National Avg. |
| Gattman, MS | 121 | 39 | 22.0% |
| New Hamilton, MS | 560 | 39 | 22.0% |
| Aberdeen, MS | 5,302 | 39 | 22.0% |
| West Point, MS | 10,517 | 39 | 22.0% |
| Columbus AFB, MS | 1,689 | 39 | 22.0% |
| Hamilton, MS | 248 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Trinity Village, CA | 248 | 27 | 46.0% |
| Vernon, CA | 248 | 72 | 44.0% |
| Bartow, GA | 248 | 47 | 6.0% |
| Girard, GA | 248 | 47 | 6.0% |
| Harpers Ferry, IA | 248 | 35 | 30.0% |
| Hamilton, MS | 248 | 39 | 22.0% |
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