| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 50°F | 43°F | 11.1" |
| February | 38°F | 54°F | 46°F | 7.1" |
| March | 46°F | 65°F | 56°F | 6.7" |
| April | 54°F | 74°F | 65°F | 10.2" |
| May | 62°F | 81°F | 72°F | 7.9" |
| June | 71°F | 89°F | 81°F | 4.8" |
| July | 73°F | 90°F | 82°F | 5.6" |
| August | 72°F | 90°F | 82°F | 7.4" |
| September | 65°F | 84°F | 75°F | 33.9" |
| October | 54°F | 74°F | 64°F | 26.5" |
| November | 44°F | 63°F | 54°F | 11.0" |
| December | 39°F | 55°F | 47°F | 12.3" |
| Index | Huntsville | Alabama | National |
| Air quality index | 44 | 37 | 42 |
| Pollution index | 6,960,530 | 3,012,339 | 2,726,193 |
| Measurement | Total |
| Days measured | 361 |
| Days with good air quality | 255 |
| 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 | 0.100% |
| Carbon Tetrachloride | 0.060% |
| Lead | 0.030% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Owens Cross Roads, AL | 2,234 | 44 | 12.0% |
| Harvest, AL | 5,722 | 44 | 12.0% |
| Redstone Arsenal, AL | 1,292 | 44 | 12.0% |
| Gurley, AL | 574 | 44 | 12.0% |
| Madison, AL | 50,717 | 44 | 12.0% |
| Huntsville, AL | 199,845 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Huntington Beach, CA | 199,778 | 72 | 44.0% |
| Salt Lake City, UT | 200,133 | 51 | 2.0% |
| Yonkers, NY | 200,183 | 51 | 2.0% |
| Grand Rapids, MI | 199,417 | 38 | 24.0% |
| Glendale, CA | 199,357 | 72 | 44.0% |
| Huntsville, AL | 199,845 | 44 | 12.0% |
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