Grand Terrace, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 52.1 °F (low) to 79.4 °F (high). Annual precipitation averages 10.3 Inches. 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 | 43.0 °F | 67.2 °F | 2.33 in. |
| February | 43.8 °F | 67.6 °F | 2.63 in. |
| March | 46.4 °F | 71.0 °F | 1.7 in. |
| April | 49.0 °F | 75.3 °F | 0.59 in. |
| May | 53.9 °F | 79.9 °F | 0.22 in. |
| June | 57.9 °F | 87.0 °F | 0.08 in. |
| July | 62.8 °F | 93.7 °F | 0.04 in. |
| August | 63.6 °F | 95.2 °F | 0.04 in. |
| September | 61.0 °F | 91.9 °F | 0.09 in. |
| October | 54.4 °F | 82.9 °F | 0.44 in. |
| November | 47.0 °F | 74.2 °F | 0.61 in. |
| December | 42.0 °F | 66.5 °F | 1.54 in. |
| Annual | 52.1 °F | 79.4 °F | 10.31 in. |
| 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 : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |