| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°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 |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Aug. 21 - Aug. 31 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 21c - Crystalline Mid-Elevation Forests and Shrublands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 80422 - Black Hawk, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 12 | 17 | 22 | 30 | 37 | 44 | 42 | 36 | 26 | 17 | 11 | 25 |
| Avg Max Temp (°F) | 34 | 38 | 43 | 48 | 57 | 68 | 74 | 72 | 64 | 54 | 41 | 35 | 52 |
| Avg Precip (In.) | .74 | .74 | 1.46 | 2.49 | 2.2 | 1.66 | 2.3 | 2.33 | 1.44 | 1.14 | 1.03 | .75 | 18.28 |