Berthoud, Colorado has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.7 °C (low) to 18 °C (high). Annual precipitation averages 408.2 Millimeters. Berthoud 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 | -8.9 °C | 6.4 °C | 12.95 mm |
| February | -7.8 °C | 7.4 °C | 13.46 mm |
| March | -3.3 °C | 12.9 °C | 33.53 mm |
| April | 0.4 °C | 16.5 °C | 46.23 mm |
| May | 5.8 °C | 21.3 °C | 78.23 mm |
| June | 10.8 °C | 28.1 °C | 50.55 mm |
| July | 14.1 °C | 31.4 °C | 35.31 mm |
| August | 12.8 °C | 30.2 °C | 45.21 mm |
| September | 8.1 °C | 25.9 °C | 34.04 mm |
| October | 1.6 °C | 18.3 °C | 27.69 mm |
| November | -4.2 °C | 11.3 °C | 17.27 mm |
| December | -8.9 °C | 6.1 °C | 13.72 mm |
| Annual | 1.7 °C | 18 °C | 408.19 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 | Dfb - Humid Continental Mild Summer, Wet All Year |