Allardt, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.2 °C (low) to 18.9 °C (high). Annual precipitation averages 1503.9 Millimeters. Allardt is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.6 °C | 6.8 °C | 124.21 mm |
| February | -1.9 °C | 9.3 °C | 115.82 mm |
| March | 1.8 °C | 13.9 °C | 142.49 mm |
| April | 6.6 °C | 19.6 °C | 138.43 mm |
| May | 11.5 °C | 23.7 °C | 129.29 mm |
| June | 15.7 °C | 27.2 °C | 143.51 mm |
| July | 17.9 °C | 28.8 °C | 146.56 mm |
| August | 17.1 °C | 28.6 °C | 117.6 mm |
| September | 13.7 °C | 25.9 °C | 105.16 mm |
| October | 7.2 °C | 20.4 °C | 81.79 mm |
| November | 1.7 °C | 13.8 °C | 106.68 mm |
| December | -1.4 °C | 8.7 °C | 152.4 mm |
| Annual | 7.2 °C | 18.9 °C | 1503.94 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |