| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 26j - Foothill Grasslands |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 80808 - Calhan, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 14 | 20 | 27 | 37 | 46 | 52 | 50 | 41 | 30 | 19 | 12 | 30 |
| Avg Max Temp (°F) | 41 | 45 | 50 | 58 | 67 | 78 | 83 | 81 | 74 | 64 | 49 | 43 | 61 |
| Avg Precip (In.) | .38 | .39 | 1.13 | 1.73 | 2.46 | 2.08 | 2.88 | 2.75 | 1.15 | .87 | .74 | .46 | 17.02 |