| 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 | Hatley | Mississippi | National |
| Air quality index | 39 | 40 | 42 |
| Pollution index | 729,997 | 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 | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.030% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Gattman, MS | 121 | 39 | 22.0% |
| Nettleton, MS | 2,455 | 39 | 22.0% |
| Aberdeen, MS | 5,302 | 39 | 22.0% |
| Smithville, MS | 628 | 39 | 22.0% |
| Amory, MS | 6,873 | 39 | 22.0% |
| Hatley, MS | 650 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Grand Ridge, IL | 650 | 0 | 100.0% |
| Milroy, IN | 650 | 28 | 44.0% |
| Hungry Horse, MT | 650 | 37 | 26.0% |
| Rockleigh, NJ | 650 | 51 | 2.0% |
| Gilbert, SC | 650 | 43 | 14.0% |
| Hatley, MS | 650 | 39 | 22.0% |
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