| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 57°F | 44°F | 5.0" |
| February | 36°F | 60°F | 47°F | 4.7" |
| March | 44°F | 69°F | 55°F | 5.5" |
| April | 51°F | 77°F | 63°F | 4.9" |
| May | 59°F | 82°F | 70°F | 4.6" |
| June | 67°F | 90°F | 77°F | 3.3" |
| July | 70°F | 91°F | 79°F | 5.0" |
| August | 70°F | 91°F | 79°F | 4.5" |
| September | 64°F | 86°F | 74°F | 2.5" |
| October | 52°F | 76°F | 63°F | 3.6" |
| November | 41°F | 66°F | 52°F | 3.7" |
| December | 38°F | 59°F | 47°F | 5.4" |
| Index | Delta | Alabama | National |
| Air quality index | 38 | 37 | 42 |
| Pollution index | 5,453,470 | 3,012,339 | 2,726,193 |
| Measurement | Total |
| Days measured | 114 |
| Days with good air quality | 88 |
| Days with moderate air quality | 26 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.280% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Heflin, AL | 3,453 | 38 | 24.0% |
| West End-Cobb Town, AL | 3,492 | 38 | 24.0% |
| Wedowee, AL | 854 | 38 | 24.0% |
| Hobson City, AL | 777 | 38 | 24.0% |
| Ashland, AL | 1,680 | 38 | 24.0% |
| Delta, AL | 118 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Chalkyitsik, AK | 118 | 38 | 24.0% |
| Reed, AR | 118 | 43 | 14.0% |
| Katherine, AZ | 118 | 13 | 74.0% |
| Montgomery Creek, CA | 118 | 42 | 16.0% |
| Fernan Lake Village, ID | 118 | 43 | 14.0% |
| Delta, AL | 118 | 38 | 24.0% |
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