| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 56°F | 42°F | 4.9" |
| February | 32°F | 59°F | 44°F | 4.0" |
| March | 40°F | 68°F | 53°F | 5.2" |
| April | 47°F | 78°F | 62°F | 5.1" |
| May | 55°F | 84°F | 69°F | 4.2" |
| June | 65°F | 91°F | 77°F | 3.3" |
| July | 68°F | 92°F | 79°F | 3.6" |
| August | 68°F | 92°F | 79°F | 3.8" |
| September | 61°F | 87°F | 73°F | 3.5" |
| October | 48°F | 77°F | 61°F | 4.0" |
| November | 37°F | 66°F | 50°F | 3.8" |
| December | 34°F | 58°F | 45°F | 6.5" |
| Index | Calhoun | Georgia | National |
| Air quality index | 43 | 41 | 42 |
| Pollution index | 14,162,500 | 1,874,972 | 2,726,193 |
| Measurement | Total |
| Days measured | 250 |
| Days with good air quality | 211 |
| Days with moderate air quality | 39 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.220% |
| Benzene | 0.180% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.100% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| Fairmount, GA | 1,163 | 43 | 14.0% |
| Ranger, GA | 73 | 43 | 14.0% |
| Resaca, GA | 1,636 | 43 | 14.0% |
| Shannon, GA | 2,136 | 44 | 12.0% |
| Plainville, GA | 398 | 44 | 12.0% |
| Calhoun, GA | 17,644 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| North Canton, OH | 17,640 | 46 | 8.0% |
| Bracebridge, ON | 17,648 | n/a | |
| Winder, GA | 17,650 | 44 | 12.0% |
| Mattoon, IL | 17,637 | 40 | 20.0% |
| Lake Mary, FL | 17,634 | 37 | 26.0% |
| Calhoun, GA | 17,644 | 43 | 14.0% |