Morton, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.2 °C (low) to 24.7 °C (high). Annual precipitation averages 1514.4 Millimeters. Morton is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.4 °C | 14.5 °C | 142.75 mm |
| February | 3.2 °C | 17 °C | 144.02 mm |
| March | 6.7 °C | 21.1 °C | 145.8 mm |
| April | 10.6 °C | 24.8 °C | 151.13 mm |
| May | 15.3 °C | 28.6 °C | 106.68 mm |
| June | 19.3 °C | 31.9 °C | 117.35 mm |
| July | 20.8 °C | 33.1 °C | 140.72 mm |
| August | 20.4 °C | 33.2 °C | 115.06 mm |
| September | 17.4 °C | 30.9 °C | 96.01 mm |
| October | 10.9 °C | 26 °C | 90.68 mm |
| November | 5.2 °C | 19.8 °C | 120.65 mm |
| December | 2.7 °C | 15.6 °C | 143.51 mm |
| Annual | 11.2 °C | 24.7 °C | 1514.36 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |