Blue River, Colorado has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from 22.9 °F (low) to 49.1 °F (high). Annual precipitation averages 23.8 Inches. Blue River is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.3 °F | 30.4 °F | 1.7 in. |
| February | 7.4 °F | 31.3 °F | 1.89 in. |
| March | 14.1 °F | 38.4 °F | 2.36 in. |
| April | 20.4 °F | 44.7 °F | 2.92 in. |
| May | 28.5 °F | 55.0 °F | 2.4 in. |
| June | 35.3 °F | 66.0 °F | 1.18 in. |
| July | 42.0 °F | 71.4 °F | 2.27 in. |
| August | 39.9 °F | 68.8 °F | 2.4 in. |
| September | 33.7 °F | 62.7 °F | 1.69 in. |
| October | 25.0 °F | 50.9 °F | 1.73 in. |
| November | 14.5 °F | 38.9 °F | 1.7 in. |
| December | 6.7 °F | 30.1 °F | 1.56 in. |
| Annual | 22.9 °F | 49.1 °F | 23.8 in. |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Exceptional Drought |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |