Allentown, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.7 °C (low) to 24.4 °C (high). Annual precipitation averages 1223.3 Millimeters. Allentown 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 | 1.8 °C | 14.4 °C | 113.28 mm |
| February | 3.4 °C | 16.6 °C | 116.84 mm |
| March | 6.7 °C | 20.6 °C | 113.28 mm |
| April | 10.7 °C | 24.7 °C | 94.23 mm |
| May | 15.7 °C | 28.7 °C | 72.9 mm |
| June | 19.8 °C | 31.7 °C | 115.82 mm |
| July | 21.7 °C | 33.3 °C | 117.35 mm |
| August | 21.2 °C | 32.5 °C | 112.78 mm |
| September | 18.2 °C | 29.9 °C | 99.31 mm |
| October | 12 °C | 25.2 °C | 70.87 mm |
| November | 6.1 °C | 19.9 °C | 76.71 mm |
| December | 3.2 °C | 15.8 °C | 119.89 mm |
| Annual | 11.7 °C | 24.4 °C | 1223.26 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |