| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 30°F | 52°F | 40°F | 9.4" |
| February | 33°F | 56°F | 43°F | 6.6" |
| March | 41°F | 65°F | 52°F | 7.6" |
| April | 49°F | 75°F | 61°F | 8.5" |
| May | 57°F | 80°F | 68°F | 8.0" |
| June | 65°F | 89°F | 76°F | 4.2" |
| July | 68°F | 90°F | 78°F | 7.3" |
| August | 67°F | 90°F | 77°F | 6.7" |
| September | 61°F | 85°F | 71°F | 7.0" |
| October | 48°F | 75°F | 60°F | 8.0" |
| November | 38°F | 63°F | 49°F | 7.2" |
| December | 35°F | 55°F | 43°F | 11.2" |
| Index | Winfield | Alabama | National |
| Air quality index | 35 | 37 | 42 |
| Pollution index | 1,799,140 | 3,012,339 | 2,726,193 |
| Measurement | Total |
| Days measured | 264 |
| Days with good air quality | 240 |
| Days with moderate air quality | 24 |
| 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 | 0.002% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Eldridge, AL | 125 | 35 | 30.0% |
| Glen Allen, AL | 363 | 35 | 30.0% |
| Kansas, AL | 129 | 35 | 30.0% |
| Gu-Win, AL | 143 | 35 | 30.0% |
| Brilliant, AL | 1,235 | 37 | 26.0% |
| Winfield, AL | 4,443 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Beecher, IL | 4,443 | 55 | 10.0% |
| Lebanon, IL | 4,443 | 54 | 8.0% |
| Stellarton, NS | 4,442 | n/a | |
| Dilley, TX | 4,441 | 49 | 2.0% |
| Armonk, NY | 4,440 | 43 | 14.0% |
| Winfield, AL | 4,443 | 35 | 30.0% |
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