Silverton, Colorado has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from 21.2 °F (low) to 52.9 °F (high). Annual precipitation averages 24.1 Inches. Silverton is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around Aug. 1 - Aug. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.9 °F | 34.3 °F | 1.82 in. |
| February | 3.3 °F | 37.2 °F | 1.91 in. |
| March | 11.6 °F | 43.8 °F | 2.07 in. |
| April | 20.3 °F | 49.2 °F | 1.61 in. |
| May | 28.5 °F | 58.4 °F | 1.79 in. |
| June | 35.2 °F | 69.5 °F | 1.06 in. |
| July | 41.4 °F | 74.0 °F | 2.42 in. |
| August | 40.7 °F | 71.3 °F | 3.08 in. |
| September | 33.9 °F | 65.3 °F | 2.98 in. |
| October | 24.3 °F | 54.8 °F | 2.25 in. |
| November | 12.2 °F | 43.5 °F | 1.55 in. |
| December | 1.8 °F | 33.6 °F | 1.55 in. |
| Annual | 21.2 °F | 52.9 °F | 24.09 in. |
| Average First Frost Date | Aug. 1 - Aug. 10 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |