| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F Zone 4b: -25°F to -20°F Zone 6a: -10°F to -5°F Zone 4a: -30°F to -25°F | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| Average First Frost Date: | Aug. 1 - Aug. 10 | |
| Average Last Frost Date: | Jul. 1 - Jul. 10 | |
| Koppen-Geiger Climate Zone: | Dfc - Subarctic With Cool Summers And Year Around Rainfall | |
| Ecoregion: | 21a - Alpine Zone | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 81433 - Silverton, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 2 | 5 | 10 | 18 | 27 | 32 | 38 | 38 | 31 | 22 | 10 | 3 | 20 |
| Avg Max Temp (°F) | 32 | 36 | 42 | 47 | 54 | 64 | 70 | 67 | 60 | 51 | 39 | 33 | 50 |
| Avg Precip (In.) | 2.17 | 1.92 | 1.89 | 1.95 | 1.91 | 1.21 | 2.43 | 2.97 | 2.33 | 2.2 | 1.84 | 1.49 | 24.31 |