| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 58°F | 45°F | 13.9" |
| February | 38°F | 63°F | 49°F | 5.6" |
| March | 46°F | 71°F | 57°F | 4.5" |
| April | 53°F | 79°F | 65°F | 5.0" |
| May | 60°F | 84°F | 71°F | 8.2" |
| June | 69°F | 90°F | 78°F | 8.1" |
| July | 71°F | 93°F | 81°F | 3.8" |
| August | 71°F | 92°F | 80°F | 3.8" |
| September | 65°F | 89°F | 75°F | 6.2" |
| October | 53°F | 81°F | 66°F | 8.3" |
| November | 43°F | 69°F | 55°F | 7.5" |
| December | 41°F | 62°F | 51°F | 5.6" |
| Index | Harpersville | Alabama | National |
| Air quality index | 38 | 37 | 42 |
| Pollution index | 2,562,360 | 3,012,339 | 2,726,193 |
| Measurement | Total |
| Days measured | 114 |
| Days with good air quality | 88 |
| Days with moderate air quality | 26 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.005% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.030% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| Mignon, AL | 771 | 38 | 24.0% |
| Vincent, AL | 1,956 | 38 | 24.0% |
| Bon Air, AL | 77 | 38 | 24.0% |
| Oak Grove, AL | 867 | 38 | 24.0% |
| Childersburg, AL | 4,872 | 38 | 24.0% |
| Harpersville, AL | 1,706 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Quincy, CA | 1,706 | 46 | 8.0% |
| Lockport Heights, LA | 1,706 | 41 | 18.0% |
| Katonah, NY | 1,706 | 43 | 14.0% |
| North Belle Vernon, PA | 1,706 | 56 | 12.0% |
| Erin, TN | 1,706 | 40 | 20.0% |
| Harpersville, AL | 1,706 | 38 | 24.0% |
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