| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 61°F | 48°F | 4.3" |
| February | 39°F | 65°F | 51°F | 4.8" |
| March | 47°F | 74°F | 59°F | 3.0" |
| April | 53°F | 80°F | 66°F | 5.1" |
| May | 61°F | 87°F | 73°F | 2.8" |
| June | 69°F | 93°F | 80°F | 3.6" |
| July | 71°F | 94°F | 81°F | 4.1" |
| August | 72°F | 94°F | 81°F | 4.0" |
| September | 66°F | 89°F | 76°F | 2.8" |
| October | 54°F | 81°F | 66°F | 2.3" |
| November | 43°F | 71°F | 56°F | 3.1" |
| December | 41°F | 65°F | 52°F | 6.7" |
| Index | Clayton | Alabama | National |
| Air quality index | 35 | 37 | 42 |
| Pollution index | 1,878,090 | 3,012,339 | 2,726,193 |
| Measurement | Total |
| Days measured | 280 |
| Days with good air quality | 256 |
| 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 | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.050% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Clio, AL | 1,037 | 35 | 30.0% |
| Louisville, AL | 618 | 35 | 30.0% |
| Bakerhill, AL | 239 | 35 | 30.0% |
| Midway, AL | 499 | 52 | 4.0% |
| Clayton, AL | 2,853 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Davis, OK | 2,853 | 43 | 14.0% |
| Bunnell, FL | 2,852 | 31 | 38.0% |
| Louisa, KY | 2,852 | 42 | 16.0% |
| Eufaula, OK | 2,852 | 43 | 14.0% |
| Moosomin, SK | 2,852 | n/a | |
| Clayton, AL | 2,853 | 35 | 30.0% |
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