Three Lakes, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 43.6 °F (low) to 58.7 °F (high). Annual precipitation averages 52.3 Inches. Three Lakes 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.3 °F | 45.6 °F | 7.09 in. |
| February | 35.3 °F | 48.2 °F | 4.95 in. |
| March | 37.7 °F | 52.2 °F | 5.44 in. |
| April | 41.1 °F | 56.9 °F | 4.33 in. |
| May | 46.4 °F | 63.3 °F | 3.2 in. |
| June | 50.3 °F | 67.7 °F | 3.0 in. |
| July | 54.0 °F | 74.0 °F | 1.17 in. |
| August | 54.5 °F | 74.9 °F | 1.16 in. |
| September | 50.6 °F | 69.0 °F | 2.63 in. |
| October | 44.5 °F | 58.1 °F | 5.45 in. |
| November | 38.6 °F | 50.0 °F | 7.19 in. |
| December | 35.0 °F | 44.8 °F | 6.65 in. |
| Annual | 43.6 °F | 58.7 °F | 52.26 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |