Westmoreland, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.2 °C (low) to 20 °C (high). Annual precipitation averages 1354.1 Millimeters. Westmoreland 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 | -2.3 °C | 7 °C | 104.65 mm |
| February | -0.5 °C | 9.6 °C | 116.59 mm |
| March | 3.7 °C | 14.7 °C | 127 mm |
| April | 8.6 °C | 20.7 °C | 122.17 mm |
| May | 14.2 °C | 24.9 °C | 139.45 mm |
| June | 18.4 °C | 29.2 °C | 112.78 mm |
| July | 20.2 °C | 30.9 °C | 121.92 mm |
| August | 19.5 °C | 30.7 °C | 99.82 mm |
| September | 15.7 °C | 27.4 °C | 99.06 mm |
| October | 9.2 °C | 21.5 °C | 91.19 mm |
| November | 3.7 °C | 14.6 °C | 96.52 mm |
| December | 0.1 °C | 9.1 °C | 122.94 mm |
| Annual | 9.2 °C | 20 °C | 1354.09 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |