Chelan Falls, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 41.8 °F (low) to 62.8 °F (high). Annual precipitation averages 11 Inches. Chelan Falls is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.7 °F | 35.2 °F | 1.62 in. |
| February | 28.0 °F | 42.2 °F | 1.02 in. |
| March | 33.8 °F | 54.0 °F | 1.04 in. |
| April | 39.9 °F | 63.9 °F | 0.79 in. |
| May | 47.4 °F | 73.9 °F | 0.89 in. |
| June | 53.4 °F | 80.3 °F | 0.68 in. |
| July | 59.7 °F | 89.9 °F | 0.31 in. |
| August | 59.3 °F | 89.3 °F | 0.22 in. |
| September | 52.1 °F | 79.5 °F | 0.31 in. |
| October | 42.1 °F | 63.5 °F | 0.96 in. |
| November | 33.5 °F | 46.8 °F | 1.39 in. |
| December | 26.4 °F | 35.5 °F | 1.78 in. |
| Annual | 41.8 °F | 62.8 °F | 11.01 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |