| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 64°F | 49°F | 9.9" |
| February | 41°F | 67°F | 52°F | 9.4" |
| March | 46°F | 73°F | 58°F | 7.9" |
| April | 57°F | 81°F | 68°F | 10.9" |
| May | 61°F | 86°F | 73°F | 17.6" |
| June | 72°F | 91°F | 80°F | 13.7" |
| July | 72°F | 91°F | 80°F | 9.7" |
| August | 73°F | 92°F | 81°F | 10.1" |
| September | 68°F | 90°F | 77°F | 6.6" |
| October | 56°F | 83°F | 68°F | 5.3" |
| November | 42°F | 70°F | 54°F | 9.7" |
| December | 44°F | 68°F | 54°F | 12.0" |
| Index | Columbia | Mississippi | National |
| Air quality index | 35 | 40 | 42 |
| Pollution index | 364,090 | 1,514,109 | 2,726,193 |
| Measurement | Total |
| Days measured | 358 |
| Days with good air quality | 298 |
| Days with moderate air quality | 60 |
| 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 | 0.001% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Foxworth, MS | 503 | 35 | 30.0% |
| Columbia, MS | 5,940 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Hilmar-Irwin, CA | 5,937 | 49 | 2.0% |
| Portland, CT | 5,937 | 41 | 18.0% |
| Pevely, MO | 5,937 | 54 | 8.0% |
| Annapolis, Subd. A, NS | 5,937 | n/a | |
| Brownfields, LA | 5,936 | 45 | 10.0% |
| Columbia, MS | 5,940 | 35 | 30.0% |
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