Julesburg, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 2.2 °C (low) to 18.1 °C (high). Annual precipitation averages 460.2 Millimeters. Julesburg 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 | -9.7 °C | 5.1 °C | 8.38 mm |
| February | -8.3 °C | 6.8 °C | 9.14 mm |
| March | -3.7 °C | 12.5 °C | 22.86 mm |
| April | 1 °C | 17 °C | 47.75 mm |
| May | 6.7 °C | 22.1 °C | 71.63 mm |
| June | 12.8 °C | 28.5 °C | 81.79 mm |
| July | 16.1 °C | 31.8 °C | 68.07 mm |
| August | 14.8 °C | 30.8 °C | 59.18 mm |
| September | 9.3 °C | 26.8 °C | 36.83 mm |
| October | 1.7 °C | 18.8 °C | 35.05 mm |
| November | -4.8 °C | 11.5 °C | 11.18 mm |
| December | -9.4 °C | 5.6 °C | 8.38 mm |
| Annual | 2.2 °C | 18.1 °C | 460.24 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 |