| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 64°F | 51°F | 4.7" |
| February | 43°F | 67°F | 54°F | 5.6" |
| March | 49°F | 75°F | 61°F | 4.2" |
| April | 56°F | 81°F | 68°F | 4.8" |
| May | 64°F | 88°F | 75°F | 3.3" |
| June | 71°F | 93°F | 81°F | 4.2" |
| July | 73°F | 93°F | 81°F | 4.9" |
| August | 74°F | 93°F | 81°F | 5.6" |
| September | 69°F | 89°F | 78°F | 3.0" |
| October | 57°F | 82°F | 69°F | 2.2" |
| November | 47°F | 73°F | 58°F | 3.3" |
| December | 45°F | 68°F | 55°F | 5.7" |
| Index | Altha | Florida | National |
| Air quality index | 38 | 35 | 42 |
| Pollution index | 2,559,160 | 7,570,785 | 2,726,193 |
| Measurement | Total |
| Days measured | 357 |
| Days with good air quality | 308 |
| Days with moderate air quality | 49 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Grand Ridge, FL | 800 | 35 | 30.0% |
| Marianna, FL | 6,607 | 35 | 30.0% |
| Blountstown, FL | 3,273 | 38 | 24.0% |
| Lake Mystic, FL | 601 | 38 | 24.0% |
| Sneads, FL | 2,130 | 40 | 20.0% |
| Altha, FL | 482 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Nenana, AK | 482 | 38 | 24.0% |
| Carlton, GA | 482 | 44 | 12.0% |
| Clermont, IA | 482 | 39 | 22.0% |
| Ellsworth, IA | 482 | 37 | 26.0% |
| Parkton, NC | 482 | 41 | 18.0% |
| Altha, FL | 482 | 38 | 24.0% |
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