Rule, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.2 °C (low) to 25 °C (high). Annual precipitation averages 636.5 Millimeters. Rule is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.6 °C | 13.4 °C | 26.92 mm |
| February | 0.2 °C | 15.8 °C | 33.53 mm |
| March | 4.7 °C | 20.6 °C | 44.7 mm |
| April | 9.1 °C | 25.4 °C | 53.09 mm |
| May | 14.9 °C | 29.7 °C | 82.04 mm |
| June | 19.9 °C | 33.6 °C | 90.93 mm |
| July | 21.9 °C | 35.8 °C | 45.72 mm |
| August | 21.3 °C | 35.4 °C | 56.9 mm |
| September | 17 °C | 31 °C | 74.42 mm |
| October | 10.7 °C | 25.7 °C | 56.9 mm |
| November | 4.1 °C | 19.1 °C | 39.62 mm |
| December | -0.4 °C | 14.1 °C | 31.75 mm |
| Annual | 10.2 °C | 25 °C | 636.52 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |