| 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 | Harvest | Alabama | National |
| Air quality index | 44 | 37 | 50 |
| Pollution index | 6,960,530 | 4,051,223 | 5,066,862 |
| 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, State | Population | Air Quality Index | National Avg. |
| Elkton, TN | 559 | 27 | 46% |
| Athens, AL | 24,461 | 41 | 18% |
| Huntsville, AL | 188,973 | 44 | 12% |
| Ardmore, TN | 1,269 | 44 | 12% |
| Elkmont, AL | 496 | 44 | 12% |
| Harvest, AL | 5,080 | 44 | 12% |
| City, State | Population | Air Quality Index | National Avg. |
| Angier, NC | 5,079 | 46 | 8% |
| Yosemite Lakes, CA | 5,081 | 50 | = 100 |
| Bondurant, IA | 5,079 | 39 | 22% |
| Kaser, NY | 5,082 | 51 | 2% |
| Manchester, IA | 5,083 | 39 | 22% |
| Harvest, AL | 5,080 | 44 | 12% |
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