| 2023 Hardiness Zone: | 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 |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 83b - Champlain Lowlands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 05404 - Winooski, VT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 9 | 11 | 22 | 34 | 46 | 55 | 60 | 58 | 50 | 39 | 30 | 17 | 36 |
| Avg Max Temp (°F) | 26 | 29 | 39 | 53 | 68 | 76 | 81 | 78 | 69 | 57 | 44 | 32 | 54 |
| Avg Precip (In.) | 2.16 | 1.62 | 2.22 | 2.8 | 3.25 | 3.37 | 3.89 | 3.93 | 3.76 | 3.04 | 2.98 | 2.13 | 35.14 |