Blue River, Colorado has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from -5.1 °C (low) to 9.5 °C (high). Annual precipitation averages 604.5 Millimeters. 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 | -13.7 °C | -0.9 °C | 43.18 mm |
| February | -13.7 °C | -0.4 °C | 48.01 mm |
| March | -9.9 °C | 3.6 °C | 59.94 mm |
| April | -6.4 °C | 7.1 °C | 74.17 mm |
| May | -1.9 °C | 12.8 °C | 60.96 mm |
| June | 1.8 °C | 18.9 °C | 29.97 mm |
| July | 5.6 °C | 21.9 °C | 57.66 mm |
| August | 4.4 °C | 20.4 °C | 60.96 mm |
| September | 0.9 °C | 17.1 °C | 42.93 mm |
| October | -3.9 °C | 10.5 °C | 43.94 mm |
| November | -9.7 °C | 3.8 °C | 43.18 mm |
| December | -14.1 °C | -1.1 °C | 39.62 mm |
| Annual | -5.1 °C | 9.5 °C | 604.52 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Exceptional Drought |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |