Crestline, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 6.9 °C (low) to 19.5 °C (high). Annual precipitation averages 868.7 Millimeters. Crestline is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.5 °C | 11.1 °C | 154.18 mm |
| February | 0.5 °C | 11.2 °C | 197.87 mm |
| March | 2 °C | 14.2 °C | 155.96 mm |
| April | 3.2 °C | 17.2 °C | 78.49 mm |
| May | 6.4 °C | 21.3 °C | 29.72 mm |
| June | 11.7 °C | 26.1 °C | 4.57 mm |
| July | 16.4 °C | 29.2 °C | 6.35 mm |
| August | 16.5 °C | 29.4 °C | 5.59 mm |
| September | 13.2 °C | 27.3 °C | 18.29 mm |
| October | 8 °C | 21.2 °C | 30.23 mm |
| November | 3.7 °C | 14.9 °C | 56.64 mm |
| December | 0.2 °C | 10.6 °C | 130.81 mm |
| Annual | 6.9 °C | 19.5 °C | 868.7 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 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 |