Rockvale, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 2.9 °C (low) to 19.2 °C (high). Annual precipitation averages 355.1 Millimeters. Rockvale is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.8 °C | 8.6 °C | 17.27 mm |
| February | -6.4 °C | 9.2 °C | 11.94 mm |
| March | -2.6 °C | 14 °C | 29.21 mm |
| April | 1.1 °C | 17.8 °C | 46.74 mm |
| May | 6.4 °C | 22.7 °C | 50.04 mm |
| June | 11.7 °C | 28.9 °C | 24.64 mm |
| July | 14.9 °C | 31.4 °C | 53.59 mm |
| August | 13.9 °C | 29.9 °C | 45.47 mm |
| September | 9.3 °C | 26.5 °C | 30.23 mm |
| October | 2.6 °C | 20.1 °C | 20.83 mm |
| November | -2.4 °C | 13.3 °C | 15.49 mm |
| December | -6.6 °C | 8.5 °C | 9.65 mm |
| Annual | 2.9 °C | 19.2 °C | 355.1 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |