Silt, Colorado has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.1 °F (low) to 63.6 °F (high). Annual precipitation averages 12.8 Inches. 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 | 12.3 °F | 37.4 °F | 0.93 in. |
| February | 18.1 °F | 43.7 °F | 0.78 in. |
| March | 24.7 °F | 54.6 °F | 0.91 in. |
| April | 30.8 °F | 62.1 °F | 1.28 in. |
| May | 38.3 °F | 72.0 °F | 1.33 in. |
| June | 46.2 °F | 83.9 °F | 0.73 in. |
| July | 53.7 °F | 89.9 °F | 1.02 in. |
| August | 52.0 °F | 87.1 °F | 1.16 in. |
| September | 42.9 °F | 78.7 °F | 1.45 in. |
| October | 31.4 °F | 65.3 °F | 1.51 in. |
| November | 22.0 °F | 50.8 °F | 0.89 in. |
| December | 12.9 °F | 37.7 °F | 0.76 in. |
| Annual | 32.1 °F | 63.6 °F | 12.75 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Exceptional Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |