| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 53c - Southeastern Wisconsin Savannah and Till Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 53956 - Randolph, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 7 | 12 | 23 | 34 | 46 | 55 | 60 | 57 | 49 | 38 | 26 | 14 | 35 |
| Avg Max Temp (°F) | 25 | 30 | 42 | 57 | 69 | 78 | 82 | 79 | 72 | 60 | 43 | 30 | 56 |
| Avg Precip (In.) | 1.25 | 1.16 | 2.15 | 3.25 | 3.32 | 4.02 | 4.12 | 4.03 | 3.62 | 2.41 | 2.31 | 1.49 | 33.12 |