Spencer, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.2 °C (low) to 19.3 °C (high). Annual precipitation averages 1531.6 Millimeters. Spencer is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.3 °C | 7.4 °C | 131.57 mm |
| February | -1.6 °C | 9.7 °C | 135.64 mm |
| March | 1.8 °C | 14.4 °C | 143.26 mm |
| April | 6.4 °C | 19.7 °C | 142.24 mm |
| May | 11.6 °C | 24 °C | 128.52 mm |
| June | 16.3 °C | 27.7 °C | 135.64 mm |
| July | 17.8 °C | 29.3 °C | 135.89 mm |
| August | 17.1 °C | 29.1 °C | 112.27 mm |
| September | 13.5 °C | 26.3 °C | 106.93 mm |
| October | 6.9 °C | 20.9 °C | 85.6 mm |
| November | 1.5 °C | 14.2 °C | 114.3 mm |
| December | -1.3 °C | 9.1 °C | 159.77 mm |
| Annual | 7.2 °C | 19.3 °C | 1531.63 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |