| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 55°F | 44°F | 8.9" |
| February | 38°F | 58°F | 47°F | 10.4" |
| March | 47°F | 68°F | 56°F | 11.1" |
| April | 54°F | 76°F | 64°F | 15.2" |
| May | 61°F | 82°F | 71°F | 9.3" |
| June | 69°F | 90°F | 79°F | 7.9" |
| July | 72°F | 92°F | 81°F | 4.2" |
| August | 71°F | 92°F | 80°F | 7.0" |
| September | 65°F | 87°F | 75°F | 8.4" |
| October | 53°F | 77°F | 64°F | 4.6" |
| November | 43°F | 66°F | 53°F | 3.4" |
| December | 39°F | 57°F | 47°F | 8.8" |
| Index | McCool | Mississippi | National |
| Air quality index | 33 | 40 | 42 |
| Pollution index | 624,703 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 101 |
| Days with good air quality | 77 |
| Days with moderate air quality | 24 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Ethel, MS | 542 | 33 | 34.0% |
| French Camp, MS | 250 | 33 | 34.0% |
| Kosciusko, MS | 6,778 | 33 | 34.0% |
| Weir, MS | 640 | 33 | 34.0% |
| Ackerman, MS | 1,700 | 33 | 34.0% |
| McCool, MS | 115 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Nikolai, AK | 115 | 31 | 38.0% |
| Onycha, AL | 115 | 35 | 30.0% |
| Staves, AR | 115 | 32 | 36.0% |
| Wet Camp Village, AZ | 115 | 74 | 48.0% |
| Mettler, CA | 115 | 67 | 34.0% |
| McCool, MS | 115 | 33 | 34.0% |
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