Mountain Gate, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 9.3 °C (low) to 23.6 °C (high). Annual precipitation averages 1583.7 Millimeters. Mountain Gate is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Jan. 11 - Jan. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3 °C | 12.9 °C | 283.21 mm |
| February | 3.8 °C | 15 °C | 275.59 mm |
| March | 5.1 °C | 17.6 °C | 247.65 mm |
| April | 7.1 °C | 20.9 °C | 117.86 mm |
| May | 11 °C | 26.1 °C | 68.07 mm |
| June | 14.8 °C | 31.2 °C | 33.53 mm |
| July | 17.7 °C | 36.3 °C | 2.79 mm |
| August | 16.7 °C | 35.7 °C | 4.06 mm |
| September | 14.2 °C | 32.6 °C | 14.99 mm |
| October | 9.9 °C | 25.6 °C | 70.87 mm |
| November | 5.5 °C | 17.2 °C | 169.42 mm |
| December | 2.9 °C | 12.4 °C | 295.66 mm |
| Annual | 9.3 °C | 23.6 °C | 1583.7 mm |
| Average First Frost Date | Jan. 11 - Jan. 20 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |