Norris, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.5 °C (low) to 20.5 °C (high). Annual precipitation averages 1449.6 Millimeters. Norris is located in USDA Plant Hardiness Zone 7b. 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 | -2.3 °C | 8.2 °C | 130.3 mm |
| February | -0.6 °C | 10.8 °C | 138.18 mm |
| March | 2.8 °C | 15.8 °C | 134.87 mm |
| April | 7.6 °C | 21.4 °C | 135.38 mm |
| May | 12.9 °C | 25.7 °C | 110.74 mm |
| June | 17.3 °C | 29.1 °C | 120.4 mm |
| July | 19.6 °C | 30.6 °C | 141.22 mm |
| August | 18.9 °C | 30.3 °C | 103.12 mm |
| September | 15.4 °C | 27.6 °C | 100.58 mm |
| October | 8.6 °C | 21.7 °C | 80.26 mm |
| November | 2.4 °C | 15.2 °C | 107.44 mm |
| December | -0.3 °C | 9.9 °C | 147.07 mm |
| Annual | 8.5 °C | 20.5 °C | 1449.56 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 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 |