Big Lake, Texas has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 10.5 °C (low) to 25.3 °C (high). Annual precipitation averages 430.3 Millimeters. Big Lake is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.3 °C | 14.6 °C | 18.8 mm |
| February | 1.6 °C | 17.3 °C | 23.62 mm |
| March | 5.7 °C | 21.7 °C | 26.92 mm |
| April | 9.9 °C | 26.5 °C | 29.72 mm |
| May | 15.3 °C | 30.5 °C | 55.88 mm |
| June | 19.8 °C | 33.6 °C | 50.8 mm |
| July | 20.7 °C | 34.2 °C | 37.34 mm |
| August | 20.5 °C | 34.2 °C | 48.26 mm |
| September | 16.6 °C | 30.7 °C | 55.12 mm |
| October | 11.2 °C | 25.7 °C | 35.31 mm |
| November | 4.7 °C | 19.4 °C | 29.97 mm |
| December | 0.7 °C | 14.9 °C | 18.54 mm |
| Annual | 10.5 °C | 25.3 °C | 430.28 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |