Hockinson, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 42.7 °F (low) to 61.8 °F (high). Annual precipitation averages 53.8 Inches. 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 | 34.1 °F | 45.8 °F | 7.41 in. |
| February | 34.2 °F | 49.9 °F | 5.43 in. |
| March | 36.8 °F | 54.6 °F | 5.94 in. |
| April | 40.2 °F | 59.8 °F | 4.48 in. |
| May | 45.7 °F | 66.8 °F | 3.59 in. |
| June | 49.7 °F | 71.3 °F | 2.47 in. |
| July | 53.7 °F | 78.9 °F | 0.69 in. |
| August | 53.6 °F | 80.0 °F | 0.86 in. |
| September | 49.4 °F | 74.6 °F | 2.26 in. |
| October | 43.0 °F | 62.9 °F | 4.93 in. |
| November | 37.8 °F | 51.8 °F | 7.59 in. |
| December | 33.9 °F | 45.1 °F | 8.12 in. |
| Annual | 42.7 °F | 61.8 °F | 53.77 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |