| 2023 Hardiness Zone: | 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 |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Sep.11 - Sep. 20 |
| Average Last Frost Date: | Jun. 11 - Jun. 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 21c - Crystalline Mid-Elevation Forests and Shrublands |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 80465 - Morrison, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 9 | 12 | 18 | 25 | 33 | 41 | 46 | 45 | 37 | 27 | 17 | 10 | 27 |
| Avg Max Temp (°F) | 43 | 45 | 49 | 55 | 64 | 75 | 81 | 79 | 72 | 62 | 49 | 44 | 60 |
| Avg Precip (In.) | .66 | .78 | 2.24 | 2.8 | 2.87 | 2.06 | 2.24 | 2.39 | 1.44 | 1.37 | 1.44 | .95 | 21.24 |