Suwanee, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.9 °C (low) to 21.9 °C (high). Annual precipitation averages 1386.6 Millimeters. Suwanee is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.4 °C | 10.8 °C | 127.25 mm |
| February | 1.2 °C | 13.1 °C | 123.95 mm |
| March | 4.6 °C | 17.6 °C | 129.79 mm |
| April | 8.8 °C | 22.3 °C | 108.71 mm |
| May | 14 °C | 26.3 °C | 102.62 mm |
| June | 18.4 °C | 29.8 °C | 117.6 mm |
| July | 20.4 °C | 31.4 °C | 129.03 mm |
| August | 19.9 °C | 31.1 °C | 116.59 mm |
| September | 16.5 °C | 28.1 °C | 108.46 mm |
| October | 10.2 °C | 22.8 °C | 94.74 mm |
| November | 4.2 °C | 17 °C | 106.17 mm |
| December | 1.4 °C | 12.4 °C | 121.67 mm |
| Annual | 9.9 °C | 21.9 °C | 1386.58 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |