Garrett, Washington has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 41.9 °F (low) to 64.7 °F (high). Annual precipitation averages 15.6 Inches. Garrett is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 29.0 °F | 41.9 °F | 1.79 in. |
| February | 30.8 °F | 47.4 °F | 1.41 in. |
| March | 35.3 °F | 56.6 °F | 1.61 in. |
| April | 40.1 °F | 64.0 °F | 1.63 in. |
| May | 46.8 °F | 72.5 °F | 1.7 in. |
| June | 52.8 °F | 79.5 °F | 1.11 in. |
| July | 58.1 °F | 89.7 °F | 0.3 in. |
| August | 57.3 °F | 89.3 °F | 0.41 in. |
| September | 49.5 °F | 79.6 °F | 0.68 in. |
| October | 40.7 °F | 65.0 °F | 1.31 in. |
| November | 33.8 °F | 50.1 °F | 1.77 in. |
| December | 28.9 °F | 41.3 °F | 1.89 in. |
| Annual | 41.9 °F | 64.7 °F | 15.61 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |