Quartz Hill, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 8.8 °C (low) to 24.9 °C (high). Annual precipitation averages 195.8 Millimeters. Quartz Hill is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.9 °C | 15.1 °C | 40.64 mm |
| February | 2.2 °C | 16.4 °C | 48.77 mm |
| March | 4.5 °C | 19.6 °C | 29.46 mm |
| April | 7 °C | 22.6 °C | 11.68 mm |
| May | 11.2 °C | 26.9 °C | 4.06 mm |
| June | 15.3 °C | 32.1 °C | 1.02 mm |
| July | 18.9 °C | 35.9 °C | 2.54 mm |
| August | 18.2 °C | 36.1 °C | 0.76 mm |
| September | 14.6 °C | 32.8 °C | 3.05 mm |
| October | 9 °C | 26.6 °C | 8.64 mm |
| November | 3.4 °C | 19.8 °C | 10.16 mm |
| December | 0.2 °C | 14.4 °C | 35.05 mm |
| Annual | 8.8 °C | 24.9 °C | 195.83 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |