Golden, Colorado has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37 °F (low) to 64.5 °F (high). Annual precipitation averages 19.6 Inches. 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 | 20.0 °F | 46.0 °F | 0.69 in. |
| February | 20.7 °F | 46.9 °F | 0.93 in. |
| March | 27.8 °F | 55.0 °F | 1.69 in. |
| April | 33.8 °F | 60.6 °F | 2.86 in. |
| May | 42.9 °F | 69.4 °F | 2.74 in. |
| June | 52.2 °F | 81.5 °F | 2.08 in. |
| July | 58.3 °F | 87.6 °F | 2.0 in. |
| August | 56.4 °F | 85.2 °F | 1.67 in. |
| September | 48.1 °F | 77.6 °F | 1.63 in. |
| October | 36.3 °F | 64.8 °F | 1.38 in. |
| November | 27.2 °F | 53.5 °F | 1.13 in. |
| December | 19.7 °F | 45.4 °F | 0.79 in. |
| Annual | 37 °F | 64.5 °F | 19.59 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |