Smith River, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 46.6 °F (low) to 60.7 °F (high). Annual precipitation averages 76.1 Inches. 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 | 42.5 °F | 54.2 °F | 12.16 in. |
| February | 42.3 °F | 55.4 °F | 9.3 in. |
| March | 42.7 °F | 56.4 °F | 10.34 in. |
| April | 44.0 °F | 58.6 °F | 7.46 in. |
| May | 47.2 °F | 62.1 °F | 3.79 in. |
| June | 49.6 °F | 65.1 °F | 2.01 in. |
| July | 52.0 °F | 66.9 °F | 0.35 in. |
| August | 52.6 °F | 66.2 °F | 0.42 in. |
| September | 50.8 °F | 67.6 °F | 1.53 in. |
| October | 48.1 °F | 64.2 °F | 5.28 in. |
| November | 45.0 °F | 57.4 °F | 10.01 in. |
| December | 42.1 °F | 54.0 °F | 13.47 in. |
| Annual | 46.6 °F | 60.7 °F | 76.12 in. |
| 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 : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |