| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 57°F | 45°F | 5.1" |
| February | 38°F | 60°F | 48°F | 5.7" |
| March | 46°F | 69°F | 56°F | 6.0" |
| April | 53°F | 77°F | 64°F | 5.1" |
| May | 61°F | 82°F | 71°F | 4.2" |
| June | 69°F | 90°F | 78°F | 4.2" |
| July | 71°F | 91°F | 80°F | 5.2" |
| August | 71°F | 91°F | 79°F | 5.4" |
| September | 66°F | 86°F | 75°F | 3.8" |
| October | 54°F | 77°F | 64°F | 3.3" |
| November | 43°F | 67°F | 54°F | 4.1" |
| December | 40°F | 59°F | 48°F | 5.8" |
| Index | Helena | Alabama | National |
| Air quality index | 53 | 37 | 42 |
| Pollution index | 643,923 | 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 | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| West Blocton, AL | 1,198 | 35 | 30.0% |
| Fairfield, AL | 10,749 | 53 | 6.0% |
| Midfield, AL | 4,984 | 53 | 6.0% |
| Chelsea, AL | 13,599 | 53 | 6.0% |
| Calera, AL | 14,327 | 53 | 6.0% |
| Helena, AL | 18,631 | 53 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Imperial, CA | 18,631 | 58 | 16.0% |
| Forest Park, OH | 18,632 | 54 | 8.0% |
| Cortland, NY | 18,633 | 34 | 32.0% |
| Culpeper, VA | 18,633 | 40 | 20.0% |
| Creve Coeur, MO | 18,627 | 54 | 8.0% |
| Helena, AL | 18,631 | 53 | 6.0% |
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