Lake Arrowhead, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 5.9 °C (low) to 18.7 °C (high). Annual precipitation averages 921.3 Millimeters. Lake Arrowhead is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.4 °C | 10.8 °C | 181.61 mm |
| February | -0.5 °C | 10.8 °C | 236.98 mm |
| March | 1.1 °C | 13.7 °C | 161.54 mm |
| April | 2.4 °C | 15.7 °C | 58.67 mm |
| May | 5.9 °C | 19.9 °C | 21.34 mm |
| June | 10.7 °C | 25.3 °C | 3.3 mm |
| July | 15.2 °C | 28.5 °C | 10.16 mm |
| August | 15.3 °C | 28.6 °C | 5.84 mm |
| September | 12.1 °C | 25.7 °C | 9.91 mm |
| October | 6.8 °C | 19.8 °C | 40.39 mm |
| November | 2.6 °C | 14.7 °C | 63.25 mm |
| December | -0.8 °C | 10.4 °C | 128.27 mm |
| Annual | 5.9 °C | 18.7 °C | 921.26 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |