Clear Lake, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 42.8 °F (low) to 59.6 °F (high). Annual precipitation averages 47.3 Inches. Clear Lake 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.9 °F | 46.1 °F | 6.22 in. |
| February | 34.9 °F | 48.4 °F | 4.04 in. |
| March | 37.5 °F | 52.6 °F | 4.87 in. |
| April | 40.9 °F | 58.3 °F | 4.02 in. |
| May | 45.8 °F | 65.0 °F | 3.33 in. |
| June | 49.9 °F | 69.1 °F | 2.47 in. |
| July | 52.3 °F | 74.8 °F | 1.2 in. |
| August | 52.2 °F | 75.8 °F | 1.42 in. |
| September | 48.8 °F | 69.9 °F | 2.69 in. |
| October | 43.0 °F | 60.0 °F | 4.95 in. |
| November | 38.4 °F | 50.6 °F | 6.7 in. |
| December | 34.5 °F | 45.0 °F | 5.42 in. |
| Annual | 42.8 °F | 59.6 °F | 47.33 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |