Shiro, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.3 °C (low) to 26.2 °C (high). Annual precipitation averages 1204.2 Millimeters. Shiro is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.6 °C | 16.3 °C | 99.31 mm |
| February | 6.6 °C | 18.4 °C | 80.77 mm |
| March | 10.1 °C | 22.1 °C | 91.44 mm |
| April | 13.8 °C | 25.9 °C | 89.41 mm |
| May | 18.5 °C | 29.7 °C | 127.76 mm |
| June | 22 °C | 33 °C | 107.7 mm |
| July | 23.2 °C | 34.7 °C | 72.64 mm |
| August | 22.9 °C | 35.3 °C | 90.42 mm |
| September | 20.1 °C | 32.3 °C | 100.84 mm |
| October | 14.7 °C | 27.7 °C | 122.43 mm |
| November | 9.3 °C | 21.6 °C | 111.76 mm |
| December | 5.6 °C | 17.2 °C | 109.73 mm |
| Annual | 14.3 °C | 26.2 °C | 1204.21 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |