| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 60°F | 51°F | 13.7" |
| February | 41°F | 62°F | 52°F | 10.0" |
| March | 49°F | 72°F | 60°F | 9.8" |
| April | 52°F | 76°F | 64°F | 11.7" |
| May | 61°F | 85°F | 74°F | 7.8" |
| June | 70°F | 91°F | 81°F | 6.3" |
| July | 74°F | 91°F | 82°F | 8.6" |
| August | 76°F | 95°F | 85°F | 5.7" |
| September | 70°F | 89°F | 80°F | 12.4" |
| October | 58°F | 79°F | 69°F | 8.2" |
| November | 48°F | 70°F | 58°F | 6.9" |
| December | 41°F | 63°F | 51°F | 5.8" |
| Index | Millbrook | Alabama | National |
| Air quality index | 52 | 37 | 42 |
| Pollution index | 2,072,150 | 3,012,339 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 171 |
| Days with moderate air quality | 193 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.020% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Blue Ridge, AL | 1,353 | 52 | 4.0% |
| Holtville, AL | 4,476 | 52 | 4.0% |
| Marbury, AL | 2,040 | 52 | 4.0% |
| Coosada, AL | 935 | 52 | 4.0% |
| Montgomery, AL | 199,054 | 52 | 4.0% |
| Millbrook, AL | 16,037 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Tracadie, NB | 16,034 | n/a | |
| Boulder City, NV | 16,048 | 54 | 8.0% |
| Ripon, CA | 16,049 | 49 | 2.0% |
| Laguna Woods, CA | 16,056 | 89 | 78.0% |
| Fort Mohave, AZ | 16,016 | 13 | 74.0% |
| Millbrook, AL | 16,037 | 52 | 4.0% |
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