Golden, Colorado has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.8 °C (low) to 18 °C (high). Annual precipitation averages 497.6 Millimeters. Golden is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.7 °C | 7.8 °C | 17.53 mm |
| February | -6.3 °C | 8.3 °C | 23.62 mm |
| March | -2.3 °C | 12.8 °C | 42.93 mm |
| April | 1 °C | 15.9 °C | 72.64 mm |
| May | 6.1 °C | 20.8 °C | 69.6 mm |
| June | 11.2 °C | 27.5 °C | 52.83 mm |
| July | 14.6 °C | 30.9 °C | 50.8 mm |
| August | 13.6 °C | 29.6 °C | 42.42 mm |
| September | 8.9 °C | 25.3 °C | 41.4 mm |
| October | 2.4 °C | 18.2 °C | 35.05 mm |
| November | -2.7 °C | 11.9 °C | 28.7 mm |
| December | -6.8 °C | 7.4 °C | 20.07 mm |
| Annual | 2.8 °C | 18 °C | 497.59 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |