| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F | |
| 1990 Hardiness Zone: | Zone 7a: 0F to 5F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| Average Last Frost Date: | Apr. 21 - Apr. 30 | |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate | |
| Ecoregion: | 20b - Shale and Sedimentary Basins | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 81520 - Clifton, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 23 | 32 | 38 | 47 | 56 | 62 | 60 | 51 | 40 | 28 | 19 | 39 |
| Avg Max Temp (°F) | 38 | 46 | 56 | 64 | 75 | 86 | 92 | 90 | 81 | 67 | 51 | 40 | 66 |
| Avg Precip (In.) | .54 | .48 | .94 | .81 | 1.07 | .46 | .76 | .77 | .84 | .95 | .79 | .55 | 8.98 |