Lake Stickney, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.7 °C (low) to 14.6 °C (high). Annual precipitation averages 1142.8 Millimeters. 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 | 2.1 °C | 7.6 °C | 154.18 mm |
| February | 2.2 °C | 8.9 °C | 114.55 mm |
| March | 3.5 °C | 11.1 °C | 121.16 mm |
| April | 5.3 °C | 13.6 °C | 95 mm |
| May | 8.1 °C | 17.2 °C | 61.21 mm |
| June | 10.2 °C | 19.3 °C | 53.09 mm |
| July | 12.2 °C | 22.6 °C | 23.88 mm |
| August | 12.6 °C | 23.1 °C | 26.67 mm |
| September | 10.7 °C | 20.2 °C | 45.47 mm |
| October | 7.4 °C | 14.7 °C | 110.24 mm |
| November | 3.9 °C | 10.1 °C | 177.8 mm |
| December | 2.1 °C | 7.3 °C | 159.51 mm |
| Annual | 6.7 °C | 14.6 °C | 1142.76 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |