Hockinson, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5.9 °C (low) to 16.6 °C (high). Annual precipitation averages 1365.8 Millimeters. Hockinson is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.2 °C | 7.7 °C | 188.21 mm |
| February | 1.2 °C | 9.9 °C | 137.92 mm |
| March | 2.7 °C | 12.6 °C | 150.88 mm |
| April | 4.6 °C | 15.4 °C | 113.79 mm |
| May | 7.6 °C | 19.3 °C | 91.19 mm |
| June | 9.8 °C | 21.8 °C | 62.74 mm |
| July | 12.1 °C | 26.1 °C | 17.53 mm |
| August | 12 °C | 26.7 °C | 21.84 mm |
| September | 9.7 °C | 23.7 °C | 57.4 mm |
| October | 6.1 °C | 17.2 °C | 125.22 mm |
| November | 3.2 °C | 11 °C | 192.79 mm |
| December | 1.1 °C | 7.3 °C | 206.25 mm |
| Annual | 5.9 °C | 16.6 °C | 1365.76 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 50-75 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 |