| 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. 11 - Oct. 20 | |
| 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: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 57066 - Tyndall, SD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 14 | 25 | 37 | 49 | 58 | 63 | 61 | 51 | 38 | 25 | 12 | 37 |
| Avg Max Temp (°F) | 28 | 35 | 46 | 60 | 72 | 82 | 87 | 85 | 76 | 63 | 44 | 31 | 59 |
| Avg Precip (In.) | .46 | .68 | 1.67 | 2.55 | 3.65 | 3.18 | 3.49 | 2.65 | 2.31 | 1.67 | 1.32 | .59 | 24.21 |