Trinidad, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 7.8 °C (low) to 14.9 °C (high). Annual precipitation averages 1321.8 Millimeters. Trinidad 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 | 5.6 °C | 12.8 °C | 233.68 mm |
| February | 5.5 °C | 13.2 °C | 191.52 mm |
| March | 5.8 °C | 13.4 °C | 183.13 mm |
| April | 6.6 °C | 13.6 °C | 112.01 mm |
| May | 8.2 °C | 14.7 °C | 65.28 mm |
| June | 9.6 °C | 15.9 °C | 20.57 mm |
| July | 11.1 °C | 16.6 °C | 9.91 mm |
| August | 11.3 °C | 17.2 °C | 5.33 mm |
| September | 9.9 °C | 17.3 °C | 24.89 mm |
| October | 8.3 °C | 16.4 °C | 78.99 mm |
| November | 6.7 °C | 14.6 °C | 155.19 mm |
| December | 5.2 °C | 12.6 °C | 241.3 mm |
| Annual | 7.8 °C | 14.9 °C | 1321.8 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 |