| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 52°F | 42°F | 5.0" |
| February | 35°F | 55°F | 44°F | 4.0" |
| March | 43°F | 65°F | 54°F | 4.4" |
| April | 51°F | 74°F | 62°F | 4.5" |
| May | 59°F | 80°F | 69°F | 4.2" |
| June | 67°F | 88°F | 77°F | 3.6" |
| July | 70°F | 89°F | 78°F | 4.2" |
| August | 70°F | 88°F | 78°F | 5.2" |
| September | 64°F | 82°F | 72°F | 4.1" |
| October | 52°F | 73°F | 62°F | 4.5" |
| November | 42°F | 63°F | 52°F | 3.8" |
| December | 38°F | 56°F | 46°F | 5.8" |
| Index | Helen | Georgia | National |
| Air quality index | 37 | 41 | 42 |
| Pollution index | 2,562,830 | 1,874,972 | 2,726,193 |
| Measurement | Total |
| Days measured | 340 |
| Days with good air quality | 259 |
| Days with moderate air quality | 81 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Clarkesville, GA | 1,748 | 37 | 26.0% |
| Yonah, GA | 728 | 37 | 26.0% |
| Mount Airy, GA | 1,545 | 37 | 26.0% |
| Cleveland, GA | 3,983 | 37 | 26.0% |
| Baldwin, GA | 3,593 | 37 | 26.0% |
| Helen, GA | 546 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Grannis, AR | 546 | 39 | 22.0% |
| Dayton, ID | 546 | 44 | 12.0% |
| Warren, MA | 546 | 40 | 20.0% |
| Valier, MT | 546 | 21 | 58.0% |
| Marble, NC | 546 | 30 | 40.0% |
| Helen, GA | 546 | 37 | 26.0% |
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