| 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 5a: -20F to -15F | |
| 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: | 43f - Subhumid Pierre Shale Plains | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 57580 - Winner, SD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 17 | 25 | 36 | 47 | 57 | 62 | 61 | 50 | 39 | 25 | 15 | 37 |
| Avg Max Temp (°F) | 33 | 39 | 49 | 62 | 73 | 83 | 90 | 88 | 79 | 65 | 46 | 36 | 62 |
| Avg Precip (In.) | .52 | .62 | 1.71 | 2.62 | 3.84 | 3.37 | 3.3 | 2.21 | 2.09 | 1.88 | .94 | .52 | 23.63 |