Grand Terrace, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 11.2 °C (low) to 26.3 °C (high). Annual precipitation averages 261.9 Millimeters. Grand Terrace is located in USDA Plant Hardiness Zone 10a. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.1 °C | 19.6 °C | 59.18 mm |
| February | 6.6 °C | 19.8 °C | 66.8 mm |
| March | 8 °C | 21.7 °C | 43.18 mm |
| April | 9.4 °C | 24.1 °C | 14.99 mm |
| May | 12.2 °C | 26.6 °C | 5.59 mm |
| June | 14.4 °C | 30.6 °C | 2.03 mm |
| July | 17.1 °C | 34.3 °C | 1.02 mm |
| August | 17.6 °C | 35.1 °C | 1.02 mm |
| September | 16.1 °C | 33.3 °C | 2.29 mm |
| October | 12.4 °C | 28.3 °C | 11.18 mm |
| November | 8.3 °C | 23.4 °C | 15.49 mm |
| December | 5.6 °C | 19.2 °C | 39.12 mm |
| Annual | 11.2 °C | 26.3 °C | 261.89 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| 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 | BSk - Cold Semi-Arid Climate |