Newbern, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.3 °C (low) to 20.8 °C (high). Annual precipitation averages 1369.6 Millimeters. Newbern is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.2 °C | 7.8 °C | 101.6 mm |
| February | -0.6 °C | 10.3 °C | 114.3 mm |
| March | 3.8 °C | 15.4 °C | 128.52 mm |
| April | 9 °C | 21.2 °C | 136.4 mm |
| May | 14.7 °C | 25.9 °C | 144.27 mm |
| June | 19 °C | 30.1 °C | 120.14 mm |
| July | 20.9 °C | 31.9 °C | 98.55 mm |
| August | 19.8 °C | 31.5 °C | 81.03 mm |
| September | 15.5 °C | 28.2 °C | 93.47 mm |
| October | 8.8 °C | 22.3 °C | 100.08 mm |
| November | 3.4 °C | 15.3 °C | 115.32 mm |
| December | -0.5 °C | 9.4 °C | 135.89 mm |
| Annual | 9.3 °C | 20.8 °C | 1369.57 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 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 |