Gleason, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.9 °C (low) to 20.7 °C (high). Annual precipitation averages 1370.1 Millimeters. Gleason is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.5 °C | 7.8 °C | 103.12 mm |
| February | -0.9 °C | 10.4 °C | 109.98 mm |
| March | 3.4 °C | 15.6 °C | 129.54 mm |
| April | 8.6 °C | 21.3 °C | 130.3 mm |
| May | 14.1 °C | 25.7 °C | 148.84 mm |
| June | 18.6 °C | 29.8 °C | 116.84 mm |
| July | 20.5 °C | 31.5 °C | 107.7 mm |
| August | 19.4 °C | 31.3 °C | 84.58 mm |
| September | 15.2 °C | 28.1 °C | 95.76 mm |
| October | 8.6 °C | 22.1 °C | 95.5 mm |
| November | 3.1 °C | 15.3 °C | 116.33 mm |
| December | -0.8 °C | 9.5 °C | 131.57 mm |
| Annual | 8.9 °C | 20.7 °C | 1370.06 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |