| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate | |
| Ecoregion: | 25d - Flat to Rolling Plains | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 80543 - Milliken, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 19 | 26 | 34 | 44 | 52 | 58 | 56 | 46 | 35 | 23 | 15 | 35 |
| Avg Max Temp (°F) | 41 | 47 | 53 | 63 | 72 | 83 | 88 | 86 | 78 | 66 | 50 | 42 | 64 |
| Avg Precip (In.) | .38 | .31 | .97 | 1.78 | 2.33 | 1.86 | 1.43 | 1.18 | 1.18 | .88 | .7 | .43 | 13.42 |