Garfield, Colorado has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -3.7 °C (low) to 10.6 °C (high). Annual precipitation averages 560.8 Millimeters. Garfield is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Aug. 11 - Aug. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.7 °C | -0.1 °C | 42.67 mm |
| February | -12.1 °C | 0.6 °C | 48.26 mm |
| March | -8.7 °C | 4.9 °C | 50.55 mm |
| April | -5.2 °C | 8.5 °C | 69.6 mm |
| May | -0.8 °C | 13.7 °C | 46.99 mm |
| June | 3.6 °C | 20.4 °C | 23.62 mm |
| July | 6.7 °C | 23 °C | 61.21 mm |
| August | 5.8 °C | 21.7 °C | 63.5 mm |
| September | 2.2 °C | 18.1 °C | 37.08 mm |
| October | -2.6 °C | 11.6 °C | 39.37 mm |
| November | -8.4 °C | 4.7 °C | 35.31 mm |
| December | -12.6 °C | -0.2 °C | 42.67 mm |
| Annual | -3.7 °C | 10.6 °C | 560.83 mm |
| Average First Frost Date | Aug. 11 - Aug. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Exceptional Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |