Big Lagoon, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 8.3 °C (low) to 14.8 °C (high). Annual precipitation averages 1344.7 Millimeters. Big Lagoon is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.2 °C | 12.8 °C | 237.49 mm |
| February | 6.2 °C | 13.2 °C | 186.94 mm |
| March | 6.3 °C | 13.6 °C | 188.47 mm |
| April | 7.1 °C | 13.5 °C | 111.76 mm |
| May | 8.6 °C | 14.7 °C | 55.63 mm |
| June | 9.9 °C | 15.9 °C | 27.94 mm |
| July | 11.1 °C | 16.6 °C | 10.67 mm |
| August | 11.4 °C | 17.2 °C | 5.59 mm |
| September | 10.3 °C | 17.2 °C | 23.88 mm |
| October | 8.8 °C | 16.3 °C | 80.26 mm |
| November | 7.4 °C | 14.4 °C | 161.04 mm |
| December | 5.8 °C | 12.6 °C | 255.02 mm |
| Annual | 8.3 °C | 14.8 °C | 1344.69 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| 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 |