Fountain, Colorado has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 2 °C (low) to 18.1 °C (high). Annual precipitation averages 429.5 Millimeters. Fountain is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.3 °C | 7.2 °C | 9.14 mm |
| February | -7.5 °C | 8.1 °C | 11.94 mm |
| March | -3.4 °C | 12.9 °C | 20.57 mm |
| April | 0.4 °C | 16.3 °C | 44.96 mm |
| May | 5.8 °C | 21.4 °C | 47.5 mm |
| June | 11.1 °C | 27.9 °C | 50.04 mm |
| July | 14.4 °C | 31.1 °C | 84.33 mm |
| August | 13.3 °C | 29.3 °C | 87.63 mm |
| September | 8.7 °C | 25.7 °C | 30.48 mm |
| October | 1.8 °C | 18.6 °C | 23.62 mm |
| November | -4.1 °C | 11.8 °C | 11.18 mm |
| December | -8.2 °C | 7.1 °C | 8.13 mm |
| Annual | 2 °C | 18.1 °C | 429.52 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |