| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 52°F | 41°F | 5.0" |
| February | 34°F | 55°F | 44°F | 3.6" |
| March | 43°F | 66°F | 53°F | 4.4" |
| April | 51°F | 75°F | 62°F | 5.2" |
| May | 59°F | 81°F | 69°F | 4.5" |
| June | 67°F | 90°F | 78°F | 3.1" |
| July | 69°F | 91°F | 79°F | 4.3" |
| August | 68°F | 91°F | 78°F | 3.4" |
| September | 61°F | 85°F | 72°F | 2.9" |
| October | 50°F | 75°F | 61°F | 3.6" |
| November | 39°F | 64°F | 51°F | 3.7" |
| December | 36°F | 56°F | 45°F | 5.6" |
| Index | Lester | Alabama | National |
| Air quality index | 32 | 37 | 50 |
| Pollution index | 957,183 | 4,051,223 | 5,066,862 |
| Measurement | Total |
| Days measured | 115 |
| Days with good air quality | 95 |
| Days with moderate air quality | 20 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| Minor Hill, TN | 610 | 32 | 36% |
| Pulaski, TN | 7,728 | 32 | 36% |
| Elkton, TN | 559 | 32 | 36% |
| Lexington, AL | 683 | 35 | 30% |
| Anderson, AL | 259 | 35 | 30% |
| Lester, AL | 131 | 32 | 36% |
| City, State | Population | Air Quality Index | National Avg. |
| Latham, KS | 131 | 39 | 22% |
| Marietta, TX | 131 | 38 | 24% |
| Rocklake, ND | 131 | 34 | 32% |
| Alpine, OR | 131 | 17 | 66% |
| Wheeler, IL | 131 | 37 | 26% |
| Lester, AL | 131 | 32 | 36% |