Lake Stickney, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 44.1 °F (low) to 58.3 °F (high). Annual precipitation averages 45 Inches. Lake Stickney is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.8 °F | 45.7 °F | 6.07 in. |
| February | 35.9 °F | 48.1 °F | 4.51 in. |
| March | 38.3 °F | 52.0 °F | 4.77 in. |
| April | 41.6 °F | 56.4 °F | 3.74 in. |
| May | 46.6 °F | 63.0 °F | 2.41 in. |
| June | 50.4 °F | 66.7 °F | 2.09 in. |
| July | 54.0 °F | 72.6 °F | 0.94 in. |
| August | 54.7 °F | 73.6 °F | 1.05 in. |
| September | 51.2 °F | 68.3 °F | 1.79 in. |
| October | 45.3 °F | 58.4 °F | 4.34 in. |
| November | 39.1 °F | 50.1 °F | 7.0 in. |
| December | 35.7 °F | 45.1 °F | 6.28 in. |
| Annual | 44.1 °F | 58.3 °F | 44.99 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 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 | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |