Hiouchi, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 7.6 °C (low) to 15.7 °C (high). Annual precipitation averages 2059.9 Millimeters. Hiouchi is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Jan. 11 - Jan. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.1 °C | 11.9 °C | 340.36 mm |
| February | 5 °C | 12.9 °C | 281.43 mm |
| March | 5.3 °C | 13.8 °C | 275.84 mm |
| April | 6.2 °C | 14.4 °C | 200.91 mm |
| May | 8.1 °C | 16.2 °C | 98.55 mm |
| June | 9.6 °C | 17.8 °C | 45.47 mm |
| July | 11.1 °C | 18.8 °C | 6.35 mm |
| August | 11.3 °C | 19.4 °C | 9.4 mm |
| September | 10.1 °C | 19.3 °C | 34.29 mm |
| October | 8.3 °C | 17.8 °C | 128.52 mm |
| November | 6.3 °C | 13.8 °C | 256.29 mm |
| December | 4.7 °C | 11.8 °C | 382.52 mm |
| Annual | 7.6 °C | 15.7 °C | 2059.93 mm |
| Average First Frost Date | Jan. 11 - Jan. 20 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| 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 | Severe Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |