| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 65°F | 51°F | 5.0" |
| February | 41°F | 67°F | 54°F | 4.7" |
| March | 48°F | 74°F | 61°F | 5.0" |
| April | 55°F | 80°F | 67°F | 7.1" |
| May | 62°F | 86°F | 74°F | 5.9" |
| June | 70°F | 91°F | 80°F | 6.0" |
| July | 72°F | 92°F | 81°F | 7.6" |
| August | 73°F | 92°F | 81°F | 8.6" |
| September | 68°F | 89°F | 77°F | 5.9" |
| October | 56°F | 82°F | 68°F | 4.4" |
| November | 46°F | 73°F | 58°F | 3.6" |
| December | 43°F | 67°F | 54°F | 6.5" |
| Index | Calvert | Alabama | National |
| Air quality index | 42 | 37 | 42 |
| Pollution index | 2,726,750 | 3,012,339 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 258 |
| Days with moderate air quality | 106 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.002% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Stockton, AL | 456 | 37 | 26.0% |
| Carlton, AL | 57 | 42 | 16.0% |
| Bucks, AL | 12 | 42 | 16.0% |
| Sims Chapel, AL | 0 | 42 | 16.0% |
| Citronelle, AL | 3,919 | 42 | 16.0% |
| Calvert, AL | 149 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Rudy, AR | 149 | 36 | 28.0% |
| Blairsburg, IA | 149 | 37 | 26.0% |
| Calhoun, IL | 149 | 36 | 28.0% |
| Littleton, IL | 149 | 41 | 18.0% |
| Livingston, KY | 149 | 40 | 20.0% |
| Calvert, AL | 149 | 42 | 16.0% |
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