| 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 | 50 |
| Pollution index | 335,277 | 3,237,553 | 5,066,862 |
| 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, State | Population | Air Quality Index | National Avg. |
| Blythe, GA | 719 | 47 | 6% |
| Hephzibah, GA | 3,936 | 47 | 6% |
| Stapleton, GA | 470 | 47 | 6% |
| Dearing, GA | 747 | 47 | 6% |
| Keysville, GA | 181 | 47 | 6% |
| Harlem, GA | 2,914 | 47 | 6% |
| City, State | Population | Air Quality Index | National Avg. |
| Fairfield Harbour, NC | 2,913 | 37 | 26% |
| Baraga, MI | 2,913 | 8 | 84% |
| North Boston, NY | 2,915 | 39 | 22% |
| Preston Heights, IL | 2,916 | 55 | 10% |
| Brownville, NJ | 2,912 | 51 | 2% |
| Harlem, GA | 2,914 | 47 | 6% |
Here are the best places to live in Georgia
10 Best cities in Georgia for employment
Top 10 best public schools in Harlem
These are the 10 most affordable cities in Georgia