| 2023 Hardiness Zone: | Zone 5b: -15°F to -10°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 |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 80601 - Brighton, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 18 | 24 | 32 | 42 | 51 | 56 | 55 | 45 | 33 | 22 | 14 | 34 |
| Avg Max Temp (°F) | 42 | 47 | 54 | 62 | 71 | 82 | 88 | 86 | 77 | 66 | 50 | 43 | 64 |
| Avg Precip (In.) | .36 | .34 | 1.21 | 1.82 | 2.37 | 1.62 | 1.48 | 1.41 | 1.09 | .87 | .81 | .38 | 13.76 |