Happy, Texas has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 6 °C (low) to 22.3 °C (high). Annual precipitation averages 461.5 Millimeters. Happy is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.2 °C | 11 °C | 16.76 mm |
| February | -3.7 °C | 13.2 °C | 14.22 mm |
| March | 0.3 °C | 17.8 °C | 35.31 mm |
| April | 4.6 °C | 22.2 °C | 29.97 mm |
| May | 10.5 °C | 26.9 °C | 56.9 mm |
| June | 16.1 °C | 31.7 °C | 76.96 mm |
| July | 18 °C | 33.3 °C | 49.02 mm |
| August | 17.3 °C | 32.5 °C | 67.82 mm |
| September | 13.1 °C | 28.7 °C | 42.93 mm |
| October | 6.3 °C | 23 °C | 38.86 mm |
| November | -0.4 °C | 16.3 °C | 17.53 mm |
| December | -4.6 °C | 11.2 °C | 15.24 mm |
| Annual | 6 °C | 22.3 °C | 461.52 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |