Imperial, Texas has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 10.2 °C (low) to 27.7 °C (high). Annual precipitation averages 294.6 Millimeters. Imperial is located in USDA Plant Hardiness Zone 8a. 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 | 16.3 °C | 14.22 mm |
| February | 0.8 °C | 19.6 °C | 13.21 mm |
| March | 4.8 °C | 23.9 °C | 13.21 mm |
| April | 9.3 °C | 29 °C | 15.49 mm |
| May | 15.1 °C | 33.3 °C | 33.53 mm |
| June | 20.6 °C | 37.1 °C | 27.18 mm |
| July | 21.8 °C | 37.2 °C | 35.05 mm |
| August | 21.3 °C | 36.8 °C | 37.59 mm |
| September | 17.1 °C | 32.8 °C | 42.93 mm |
| October | 10.6 °C | 28.3 °C | 24.38 mm |
| November | 3.2 °C | 21.5 °C | 21.59 mm |
| December | -1.1 °C | 16.8 °C | 16.26 mm |
| Annual | 10.2 °C | 27.7 °C | 294.64 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 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 | Abnormally Dry |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |