Parker, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 2.3 °C (low) to 17.9 °C (high). Annual precipitation averages 447.3 Millimeters. Parker is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.7 °C | 7.3 °C | 14.73 mm |
| February | -7 °C | 7.8 °C | 14.73 mm |
| March | -2.9 °C | 12.5 °C | 35.31 mm |
| April | 0.6 °C | 15.8 °C | 56.9 mm |
| May | 5.7 °C | 20.7 °C | 59.44 mm |
| June | 11.1 °C | 27.3 °C | 60.45 mm |
| July | 14.5 °C | 30.8 °C | 57.15 mm |
| August | 13.5 °C | 29.4 °C | 51.56 mm |
| September | 8.9 °C | 25.5 °C | 32.51 mm |
| October | 2.1 °C | 18.4 °C | 30.23 mm |
| November | -3.2 °C | 12 °C | 19.05 mm |
| December | -7.7 °C | 7 °C | 15.24 mm |
| Annual | 2.3 °C | 17.9 °C | 447.3 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |