| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 59°F | 47°F | 5.0" |
| February | 39°F | 62°F | 49°F | 5.0" |
| March | 47°F | 71°F | 58°F | 6.1" |
| April | 54°F | 78°F | 66°F | 5.2" |
| May | 61°F | 84°F | 72°F | 4.3" |
| June | 69°F | 91°F | 79°F | 3.9" |
| July | 71°F | 92°F | 81°F | 6.1" |
| August | 71°F | 92°F | 81°F | 5.9" |
| September | 65°F | 88°F | 76°F | 3.2" |
| October | 53°F | 79°F | 65°F | 3.3" |
| November | 43°F | 68°F | 55°F | 4.0" |
| December | 40°F | 61°F | 49°F | 5.4" |
| Index | Demopolis | Alabama | National |
| Air quality index | 36 | 37 | 42 |
| Pollution index | 1,809,370 | 3,012,339 | 2,726,193 |
| Measurement | Total |
| Days measured | 245 |
| Days with good air quality | 229 |
| Days with moderate air quality | 16 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.020% |
| Mercury | 0.100% |
| City | Population | Air Quality Index | National Avg. |
| Faunsdale, AL | 99 | 35 | 30.0% |
| Forkland, AL | 1,229 | 35 | 30.0% |
| Greensboro, AL | 2,956 | 35 | 30.0% |
| Dayton, AL | 55 | 36 | 28.0% |
| Linden, AL | 1,838 | 36 | 28.0% |
| Demopolis, AL | 6,724 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Gulf Breeze, FL | 6,725 | 41 | 18.0% |
| Greenville, IL | 6,725 | 43 | 14.0% |
| Manorhaven, NY | 6,725 | 51 | 2.0% |
| Tallulah, LA | 6,722 | 34 | 32.0% |
| Minden Hills, ON | 6,722 | n/a | |
| Demopolis, AL | 6,724 | 36 | 28.0% |
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