Smith River, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 8.1 °C (low) to 15.9 °C (high). Annual precipitation averages 1933.4 Millimeters. Smith River is located in USDA Plant Hardiness Zone 10a. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Jan. 1 - Jan. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.8 °C | 12.3 °C | 308.86 mm |
| February | 5.7 °C | 13 °C | 236.22 mm |
| March | 5.9 °C | 13.6 °C | 262.64 mm |
| April | 6.7 °C | 14.8 °C | 189.48 mm |
| May | 8.4 °C | 16.7 °C | 96.27 mm |
| June | 9.8 °C | 18.4 °C | 51.05 mm |
| July | 11.1 °C | 19.4 °C | 8.89 mm |
| August | 11.4 °C | 19 °C | 10.67 mm |
| September | 10.4 °C | 19.8 °C | 38.86 mm |
| October | 8.9 °C | 17.9 °C | 134.11 mm |
| November | 7.2 °C | 14.1 °C | 254.25 mm |
| December | 5.6 °C | 12.2 °C | 342.14 mm |
| Annual | 8.1 °C | 15.9 °C | 1933.44 mm |
| Average First Frost Date | Jan. 1 - Jan. 10 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 10a : -1.1°C to 1.7°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |