Silverthorne, Colorado has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from 22.2 °F (low) to 52.9 °F (high). Annual precipitation averages 15.1 Inches. Silverthorne 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 | 4.8 °F | 31.8 °F | 1.22 in. |
| February | 6.6 °F | 35.0 °F | 1.03 in. |
| March | 13.3 °F | 42.5 °F | 1.16 in. |
| April | 21.0 °F | 49.2 °F | 1.34 in. |
| May | 28.9 °F | 59.3 °F | 1.23 in. |
| June | 35.2 °F | 71.0 °F | 1.11 in. |
| July | 41.3 °F | 76.4 °F | 1.73 in. |
| August | 39.7 °F | 74.0 °F | 1.77 in. |
| September | 32.7 °F | 67.4 °F | 1.45 in. |
| October | 23.4 °F | 55.0 °F | 1.14 in. |
| November | 13.7 °F | 41.6 °F | 0.9 in. |
| December | 5.5 °F | 31.9 °F | 1.01 in. |
| Annual | 22.2 °F | 52.9 °F | 15.09 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 | Exceptional Drought |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |