Blue Lake, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 7.3 °C (low) to 16.2 °C (high). Annual precipitation averages 1327.4 Millimeters. Blue Lake is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.6 °C | 13.1 °C | 223.01 mm |
| February | 4.7 °C | 13.6 °C | 183.13 mm |
| March | 5.2 °C | 13.9 °C | 179.58 mm |
| April | 6.1 °C | 14.7 °C | 124.97 mm |
| May | 7.9 °C | 16.8 °C | 55.63 mm |
| June | 9.5 °C | 17.8 °C | 40.39 mm |
| July | 11.1 °C | 18.7 °C | 6.1 mm |
| August | 11.1 °C | 19.6 °C | 5.33 mm |
| September | 9.5 °C | 20 °C | 21.34 mm |
| October | 7.6 °C | 18.8 °C | 71.12 mm |
| November | 5.8 °C | 14.9 °C | 160.53 mm |
| December | 4.2 °C | 12.6 °C | 256.29 mm |
| Annual | 7.3 °C | 16.2 °C | 1327.42 mm |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| 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 | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |