Morrison, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.4 °C (low) to 20.5 °C (high). Annual precipitation averages 1428.7 Millimeters. Morrison 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 | -2.2 °C | 8.7 °C | 125.98 mm |
| February | -0.7 °C | 10.9 °C | 124.97 mm |
| March | 3 °C | 15.8 °C | 135.13 mm |
| April | 7.7 °C | 21 °C | 131.57 mm |
| May | 12.9 °C | 25.1 °C | 120.65 mm |
| June | 17.4 °C | 28.9 °C | 131.57 mm |
| July | 19.4 °C | 30.5 °C | 114.55 mm |
| August | 18.6 °C | 30.2 °C | 108.2 mm |
| September | 14.9 °C | 27.5 °C | 101.09 mm |
| October | 8.1 °C | 21.8 °C | 78.99 mm |
| November | 2.3 °C | 15.5 °C | 103.89 mm |
| December | -0.3 °C | 10.6 °C | 152.15 mm |
| Annual | 8.4 °C | 20.5 °C | 1428.74 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 |