Itasca, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.6 °C (low) to 25 °C (high). Annual precipitation averages 1002.8 Millimeters. Itasca 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.7 °C | 14.1 °C | 68.07 mm |
| February | 3.8 °C | 16.2 °C | 73.66 mm |
| March | 7.7 °C | 20.2 °C | 94.23 mm |
| April | 11.7 °C | 24.3 °C | 92.2 mm |
| May | 17 °C | 28.4 °C | 113.28 mm |
| June | 21.3 °C | 32.7 °C | 98.55 mm |
| July | 23 °C | 35.2 °C | 46.23 mm |
| August | 22.9 °C | 35.6 °C | 60.96 mm |
| September | 19.1 °C | 31.9 °C | 84.58 mm |
| October | 13.1 °C | 26.3 °C | 119.89 mm |
| November | 7.3 °C | 19.6 °C | 76.71 mm |
| December | 2.7 °C | 14.9 °C | 74.42 mm |
| Annual | 12.6 °C | 25 °C | 1002.78 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 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 |