Silt, Colorado has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.1 °C (low) to 17.6 °C (high). Annual precipitation averages 323.8 Millimeters. Silt 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.9 °C | 3 °C | 23.62 mm |
| February | -7.7 °C | 6.5 °C | 19.81 mm |
| March | -4.1 °C | 12.6 °C | 23.11 mm |
| April | -0.7 °C | 16.7 °C | 32.51 mm |
| May | 3.5 °C | 22.2 °C | 33.78 mm |
| June | 7.9 °C | 28.8 °C | 18.54 mm |
| July | 12.1 °C | 32.2 °C | 25.91 mm |
| August | 11.1 °C | 30.6 °C | 29.46 mm |
| September | 6.1 °C | 25.9 °C | 36.83 mm |
| October | -0.3 °C | 18.5 °C | 38.35 mm |
| November | -5.6 °C | 10.4 °C | 22.61 mm |
| December | -10.6 °C | 3.2 °C | 19.3 mm |
| Annual | 0.1 °C | 17.6 °C | 323.83 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 | Exceptional Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |