| 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 | |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 46n - James River Lowland | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 57078 - Yankton, SD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 7 | 14 | 24 | 35 | 47 | 57 | 62 | 60 | 50 | 38 | 24 | 12 | 36 |
| Avg Max Temp (°F) | 28 | 35 | 46 | 60 | 72 | 82 | 87 | 85 | 77 | 64 | 44 | 32 | 59 |
| Avg Precip (In.) | .44 | .55 | 1.79 | 2.52 | 3.84 | 3.86 | 3.29 | 2.91 | 2.21 | 1.84 | 1.27 | .52 | 25.03 |