| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 60°F | 48°F | 5.0" |
| February | 41°F | 63°F | 50°F | 5.2" |
| March | 49°F | 72°F | 59°F | 5.7" |
| April | 56°F | 79°F | 66°F | 5.5" |
| May | 63°F | 84°F | 73°F | 4.9" |
| June | 71°F | 91°F | 80°F | 3.6" |
| July | 73°F | 92°F | 81°F | 4.4" |
| August | 73°F | 93°F | 82°F | 4.0" |
| September | 68°F | 89°F | 77°F | 3.6" |
| October | 55°F | 79°F | 66°F | 3.5" |
| November | 46°F | 69°F | 56°F | 4.0" |
| December | 41°F | 62°F | 50°F | 5.3" |
| Index | Madison | Mississippi | National |
| Air quality index | 44 | 40 | 42 |
| Pollution index | 5,784,070 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 256 |
| Days with moderate air quality | 109 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.005% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.030% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Ridgeland, MS | 24,194 | 44 | 12.0% |
| Canton, MS | 11,943 | 44 | 12.0% |
| Flora, MS | 2,353 | 44 | 12.0% |
| Jackson, MS | 163,778 | 44 | 12.0% |
| Flowood, MS | 9,213 | 44 | 12.0% |
| Madison, MS | 25,650 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Fairland, MD | 25,649 | 47 | 6.0% |
| Moscow, ID | 25,652 | 10 | 80.0% |
| Ruskin, FL | 25,640 | 38 | 24.0% |
| South Portland, ME | 25,665 | 40 | 20.0% |
| Soledad, CA | 25,667 | 37 | 26.0% |
| Madison, MS | 25,650 | 44 | 12.0% |
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