| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 59°F | 48°F | 3.3" |
| February | 41°F | 62°F | 50°F | 3.6" |
| March | 48°F | 71°F | 58°F | 3.4" |
| April | 56°F | 79°F | 67°F | 3.1" |
| May | 63°F | 85°F | 73°F | 2.7" |
| June | 71°F | 92°F | 80°F | 4.6" |
| July | 73°F | 93°F | 82°F | 4.4" |
| August | 73°F | 92°F | 81°F | 5.4" |
| September | 68°F | 87°F | 76°F | 3.3" |
| October | 57°F | 78°F | 67°F | 2.3" |
| November | 46°F | 68°F | 56°F | 2.6" |
| December | 43°F | 63°F | 52°F | 4.9" |
| Index | Harlem | Georgia | National |
| Air quality index | 47 | 41 | 42 |
| Pollution index | 335,277 | 1,874,972 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 219 |
| Days with moderate air quality | 144 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Dearing, GA | 631 | 47 | 6.0% |
| Keysville, GA | 339 | 47 | 6.0% |
| Thomson, GA | 6,553 | 47 | 6.0% |
| Evans, GA | 38,443 | 47 | 6.0% |
| Martinez, GA | 34,912 | 47 | 6.0% |
| Harlem, GA | 3,267 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Lewes, DE | 3,266 | 36 | 28.0% |
| North Brooksville, FL | 3,266 | 30 | 40.0% |
| McChord AFB, WA | 3,268 | 30 | 40.0% |
| Orange, OH | 3,269 | 50 | = 100 |
| Grande Cache, AB | 3,269 | n/a | |
| Harlem, GA | 3,267 | 47 | 6.0% |
Here are the best places to live in Georgia
10 Best cities in Georgia for employment
Check out the 10 safest cities in Georgia
See the best places to live in & around Harlem