| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 21f - Sedimentary Mid-Elevation Forests and Shrublands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 81620 - Avon, CO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 11 | 16 | 23 | 33 | 39 | 44 | 44 | 36 | 27 | 17 | 9 | 26 |
| Avg Max Temp (°F) | 29 | 34 | 41 | 48 | 59 | 68 | 74 | 73 | 65 | 53 | 39 | 30 | 51 |
| Avg Precip (In.) | 1.11 | 1.11 | 1.49 | 1.46 | 1.27 | 1.21 | 1.57 | 1.47 | 1.43 | .99 | 1.18 | 1.13 | 15.42 |