Poulsbo, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 44 °F (low) to 60.4 °F (high). Annual precipitation averages 38.8 Inches. Poulsbo is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 36.2 °F | 47.5 °F | 6.07 in. |
| February | 35.9 °F | 49.8 °F | 3.37 in. |
| March | 38.2 °F | 53.8 °F | 4.1 in. |
| April | 41.4 °F | 58.7 °F | 2.71 in. |
| May | 46.6 °F | 65.0 °F | 1.96 in. |
| June | 50.9 °F | 68.9 °F | 1.69 in. |
| July | 54.1 °F | 74.8 °F | 0.86 in. |
| August | 54.2 °F | 75.7 °F | 0.99 in. |
| September | 50.7 °F | 71.0 °F | 1.68 in. |
| October | 44.9 °F | 60.8 °F | 3.41 in. |
| November | 39.3 °F | 51.7 °F | 5.72 in. |
| December | 36.0 °F | 46.6 °F | 6.21 in. |
| Annual | 44 °F | 60.4 °F | 38.77 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°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 |