Mission, Texas has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 17.9 °C (low) to 30 °C (high). Annual precipitation averages 543.3 Millimeters. Mission is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.5 °C | 21.7 °C | 20.57 mm |
| February | 11.7 °C | 24.3 °C | 23.62 mm |
| March | 15 °C | 27.3 °C | 29.72 mm |
| April | 18.2 °C | 30.6 °C | 34.29 mm |
| May | 21.8 °C | 33.2 °C | 52.58 mm |
| June | 23.9 °C | 35.7 °C | 63.5 mm |
| July | 24.6 °C | 36.3 °C | 54.61 mm |
| August | 24.6 °C | 36.9 °C | 37.85 mm |
| September | 22.6 °C | 34.1 °C | 115.82 mm |
| October | 18.7 °C | 31.3 °C | 57.91 mm |
| November | 14 °C | 26.4 °C | 29.46 mm |
| December | 10.2 °C | 22.5 °C | 23.37 mm |
| Annual | 17.9 °C | 30 °C | 543.3 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10a : -1.1°C to 1.7°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |