Trout Lake, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 35.7 °F (low) to 58.8 °F (high). Annual precipitation averages 45 Inches. Trout Lake is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 26.0 °F | 38.9 °F | 7.23 in. |
| February | 27.0 °F | 42.8 °F | 5.29 in. |
| March | 30.1 °F | 49.1 °F | 5.41 in. |
| April | 33.3 °F | 55.9 °F | 2.68 in. |
| May | 39.2 °F | 66.6 °F | 1.82 in. |
| June | 44.0 °F | 70.6 °F | 1.11 in. |
| July | 48.4 °F | 81.3 °F | 0.35 in. |
| August | 48.1 °F | 83.4 °F | 0.43 in. |
| September | 41.5 °F | 73.7 °F | 1.07 in. |
| October | 35.3 °F | 59.5 °F | 3.95 in. |
| November | 30.1 °F | 45.5 °F | 7.04 in. |
| December | 25.7 °F | 37.8 °F | 8.6 in. |
| Annual | 35.7 °F | 58.8 °F | 44.98 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |