Garfield, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 2.4 °C (low) to 14.7 °C (high). Annual precipitation averages 574.1 Millimeters. 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 | -3.6 °C | 2.8 °C | 75.44 mm |
| February | -3.1 °C | 5.1 °C | 54.1 mm |
| March | -0.9 °C | 9.3 °C | 61.47 mm |
| April | 1.6 °C | 13.4 °C | 50.55 mm |
| May | 5 °C | 18.6 °C | 52.32 mm |
| June | 7.7 °C | 21.9 °C | 37.85 mm |
| July | 9.7 °C | 28.3 °C | 13.72 mm |
| August | 9.6 °C | 28.9 °C | 13.97 mm |
| September | 6.1 °C | 23.6 °C | 18.29 mm |
| October | 2 °C | 15.3 °C | 47.5 mm |
| November | -1 °C | 7.1 °C | 69.85 mm |
| December | -3.9 °C | 2.2 °C | 78.99 mm |
| Annual | 2.4 °C | 14.7 °C | 574.05 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |