| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 54°F | 42°F | 4.8" |
| February | 35°F | 57°F | 45°F | 3.2" |
| March | 44°F | 67°F | 54°F | 4.5" |
| April | 51°F | 76°F | 63°F | 4.9" |
| May | 59°F | 82°F | 70°F | 4.3" |
| June | 67°F | 91°F | 78°F | 4.2" |
| July | 70°F | 92°F | 80°F | 5.3" |
| August | 69°F | 92°F | 79°F | 4.5" |
| September | 62°F | 86°F | 73°F | 3.8" |
| October | 50°F | 76°F | 62°F | 3.9" |
| November | 40°F | 65°F | 52°F | 3.6" |
| December | 36°F | 56°F | 45°F | 5.6" |
| Index | Leighton | Alabama | National |
| Air quality index | 35 | 37 | 50 |
| Pollution index | 6,960,530 | 4,051,223 | 5,066,862 |
| Measurement | Total |
| Days measured | 285 |
| Days with good air quality | 264 |
| Days with moderate air quality | 21 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.100% |
| Carbon Tetrachloride | 0.060% |
| Lead | 0.030% |
| Mercury | 0.010% |
| City, State | Population | Air Quality Index | National Avg. |
| Florence, AL | 39,938 | 35 | 30% |
| Russellville, AL | 9,804 | 35 | 30% |
| Tuscumbia, AL | 8,506 | 35 | 30% |
| Hatton, AL | 90 | 35 | 30% |
| Muscle Shoals, AL | 13,585 | 35 | 30% |
| Leighton, AL | 934 | 35 | 30% |
| City, State | Population | Air Quality Index | National Avg. |
| Christiana, PA | 934 | 45 | 10% |
| Fort Gay, WV | 934 | 38 | 24% |
| Fordoche, LA | 934 | 46 | 8% |
| Terramuggus, CT | 934 | 46 | 8% |
| Coulterville, IL | 934 | 39 | 22% |
| Leighton, AL | 934 | 35 | 30% |
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