Fannett, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15.2 °C (low) to 25.6 °C (high). Annual precipitation averages 1580.9 Millimeters. Fannett is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.7 °C | 16.3 °C | 130.81 mm |
| February | 7.8 °C | 18.5 °C | 93.22 mm |
| March | 11.3 °C | 21.9 °C | 97.54 mm |
| April | 15 °C | 25.4 °C | 100.33 mm |
| May | 19.4 °C | 29.1 °C | 129.54 mm |
| June | 22.8 °C | 32.1 °C | 173.48 mm |
| July | 23.7 °C | 33.1 °C | 145.03 mm |
| August | 23.5 °C | 33.4 °C | 161.29 mm |
| September | 20.9 °C | 31.2 °C | 165.61 mm |
| October | 15.8 °C | 27.1 °C | 139.45 mm |
| November | 10.1 °C | 21.6 °C | 117.86 mm |
| December | 6.8 °C | 17.6 °C | 126.75 mm |
| Annual | 15.2 °C | 25.6 °C | 1580.91 mm |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |