Rock Creek Park, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.5 °C (low) to 16 °C (high). Annual precipitation averages 511.3 Millimeters. Rock Creek Park is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.9 °C | 5.8 °C | 11.68 mm |
| February | -7.4 °C | 6.1 °C | 14.99 mm |
| March | -3.8 °C | 10.6 °C | 33.02 mm |
| April | -0.4 °C | 13.8 °C | 46.74 mm |
| May | 4.6 °C | 19.3 °C | 63.75 mm |
| June | 9.8 °C | 25.8 °C | 61.72 mm |
| July | 13.3 °C | 28.3 °C | 88.39 mm |
| August | 12.4 °C | 26.7 °C | 91.69 mm |
| September | 7.8 °C | 23.7 °C | 50.8 mm |
| October | 1.4 °C | 16.4 °C | 25.4 mm |
| November | -4.2 °C | 10.2 °C | 12.95 mm |
| December | -8.1 °C | 5.7 °C | 10.16 mm |
| Annual | 1.5 °C | 16 °C | 511.29 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |