Lake Arrowhead, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 42.5 °F (low) to 65.6 °F (high). Annual precipitation averages 36.3 Inches. 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 | 31.2 °F | 51.4 °F | 7.15 in. |
| February | 31.1 °F | 51.5 °F | 9.33 in. |
| March | 33.9 °F | 56.6 °F | 6.36 in. |
| April | 36.3 °F | 60.3 °F | 2.31 in. |
| May | 42.6 °F | 67.9 °F | 0.84 in. |
| June | 51.2 °F | 77.6 °F | 0.13 in. |
| July | 59.3 °F | 83.3 °F | 0.4 in. |
| August | 59.6 °F | 83.5 °F | 0.23 in. |
| September | 53.7 °F | 78.2 °F | 0.39 in. |
| October | 44.3 °F | 67.6 °F | 1.59 in. |
| November | 36.7 °F | 58.5 °F | 2.49 in. |
| December | 30.6 °F | 50.7 °F | 5.05 in. |
| Annual | 42.5 °F | 65.6 °F | 36.27 in. |
| 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 : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |