| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 56°F | 45°F | 5.0" |
| February | 38°F | 59°F | 47°F | 5.3" |
| March | 46°F | 69°F | 56°F | 5.6" |
| April | 53°F | 77°F | 65°F | 5.9" |
| May | 61°F | 82°F | 71°F | 4.9" |
| June | 70°F | 90°F | 79°F | 4.6" |
| July | 72°F | 91°F | 81°F | 6.2" |
| August | 72°F | 91°F | 80°F | 5.0" |
| September | 66°F | 86°F | 75°F | 4.0" |
| October | 54°F | 77°F | 64°F | 3.3" |
| November | 43°F | 67°F | 54°F | 3.6" |
| December | 39°F | 58°F | 48°F | 5.7" |
| Index | Clay | Alabama | National |
| Air quality index | 53 | 37 | 42 |
| Pollution index | 18,988,200 | 3,012,339 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 150 |
| Days with moderate air quality | 197 |
| Days w/ poor A.Q. for sensitive groups | 18 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.570% |
| Benzene | 0.220% |
| Carbon Tetrachloride | 0.040% |
| Lead | 1.020% |
| Mercury | 1.230% |
| City | Population | Air Quality Index | National Avg. |
| Odenville, AL | 3,705 | 38 | 24.0% |
| Highland Lake, AL | 396 | 43 | 14.0% |
| Allgood, AL | 796 | 43 | 14.0% |
| Fultondale, AL | 9,247 | 53 | 6.0% |
| Smoke Rise, AL | 1,852 | 53 | 6.0% |
| Clay, AL | 9,936 | 53 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Box Elder, SD | 9,937 | 44 | 12.0% |
| Gages Lake, IL | 9,939 | 39 | 22.0% |
| Queens, NS | 9,932 | n/a | |
| Fort Salonga, NY | 9,930 | 43 | 14.0% |
| Astoria, OR | 9,929 | 18 | 64.0% |
| Clay, AL | 9,936 | 53 | 6.0% |
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