Covelo, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5.4 °C (low) to 22.6 °C (high). Annual precipitation averages 1094.5 Millimeters. Covelo is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.9 °C | 11.9 °C | 223.77 mm |
| February | 1.4 °C | 14.4 °C | 171.2 mm |
| March | 2.6 °C | 16.9 °C | 146.81 mm |
| April | 4 °C | 20.1 °C | 79.5 mm |
| May | 6.7 °C | 24.6 °C | 42.93 mm |
| June | 9.4 °C | 29.7 °C | 14.73 mm |
| July | 12.2 °C | 34.8 °C | 1.78 mm |
| August | 11.2 °C | 34.4 °C | 2.54 mm |
| September | 8.6 °C | 31.8 °C | 6.6 mm |
| October | 5.3 °C | 25.2 °C | 55.12 mm |
| November | 2.6 °C | 16.1 °C | 114.3 mm |
| December | 0.4 °C | 11.5 °C | 235.2 mm |
| Annual | 5.4 °C | 22.6 °C | 1094.48 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |