Garfield, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 36.4 °F (low) to 58.5 °F (high). Annual precipitation averages 22.6 Inches. Garfield is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.6 °F | 37.1 °F | 2.97 in. |
| February | 26.5 °F | 41.2 °F | 2.13 in. |
| March | 30.4 °F | 48.7 °F | 2.42 in. |
| April | 34.8 °F | 56.2 °F | 1.99 in. |
| May | 41.0 °F | 65.5 °F | 2.06 in. |
| June | 45.8 °F | 71.5 °F | 1.49 in. |
| July | 49.4 °F | 83.0 °F | 0.54 in. |
| August | 49.2 °F | 84.0 °F | 0.55 in. |
| September | 42.9 °F | 74.4 °F | 0.72 in. |
| October | 35.6 °F | 59.5 °F | 1.87 in. |
| November | 30.2 °F | 44.7 °F | 2.75 in. |
| December | 24.9 °F | 35.9 °F | 3.11 in. |
| Annual | 36.4 °F | 58.5 °F | 22.6 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |