Plains, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.9 °C (low) to 24.5 °C (high). Annual precipitation averages 1275.9 Millimeters. Plains is located in USDA Plant Hardiness Zone 8b. 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 | 2.4 °C | 14.7 °C | 117.86 mm |
| February | 3.8 °C | 16.8 °C | 112.52 mm |
| March | 6.9 °C | 20.9 °C | 124.21 mm |
| April | 10.9 °C | 24.6 °C | 102.87 mm |
| May | 15.9 °C | 28.8 °C | 74.93 mm |
| June | 19.9 °C | 31.6 °C | 121.16 mm |
| July | 21.4 °C | 32.6 °C | 133.1 mm |
| August | 21.1 °C | 32.2 °C | 108.46 mm |
| September | 18.3 °C | 29.8 °C | 102.62 mm |
| October | 12.2 °C | 25.3 °C | 65.53 mm |
| November | 6.6 °C | 20.1 °C | 84.07 mm |
| December | 3.8 °C | 16.1 °C | 128.52 mm |
| Annual | 11.9 °C | 24.5 °C | 1275.85 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |