Fulton, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 18.5 °C (low) to 25.6 °C (high). Annual precipitation averages 899.4 Millimeters. Fulton is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.1 °C | 17.7 °C | 65.28 mm |
| February | 11.1 °C | 19.5 °C | 48.26 mm |
| March | 14.7 °C | 22.2 °C | 63.5 mm |
| April | 18.3 °C | 25.1 °C | 50.8 mm |
| May | 22.4 °C | 28 °C | 86.11 mm |
| June | 25.4 °C | 30.7 °C | 97.54 mm |
| July | 26.1 °C | 31.4 °C | 74.17 mm |
| August | 25.8 °C | 32.1 °C | 58.93 mm |
| September | 23.9 °C | 31 °C | 136.14 mm |
| October | 20.2 °C | 27.6 °C | 91.44 mm |
| November | 14.6 °C | 22.9 °C | 77.72 mm |
| December | 10.3 °C | 19.1 °C | 49.53 mm |
| Annual | 18.5 °C | 25.6 °C | 899.42 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 10a : -1.1°C to 1.7°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |