| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F | |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F | |
| 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 80209 - Denver, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 20 | 26 | 34 | 43 | 52 | 58 | 57 | 47 | 36 | 25 | 18 | 36 |
| Avg Max Temp (°F) | 44 | 48 | 54 | 61 | 70 | 81 | 87 | 85 | 77 | 66 | 52 | 45 | 64 |
| Avg Precip (In.) | .54 | .53 | 1.38 | 2.13 | 2.55 | 1.86 | 1.89 | 1.75 | 1.25 | .99 | 1.04 | .65 | 16.56 |