| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°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: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | May 21 - May 31 | |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate | |
| Ecoregion: | 25a - Pine Ridge Escarpment | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 57772 - Porcupine, SD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 13 | 21 | 30 | 42 | 51 | 57 | 55 | 45 | 32 | 20 | 11 | 32 |
| Avg Max Temp (°F) | 34 | 40 | 48 | 59 | 69 | 80 | 87 | 86 | 77 | 63 | 45 | 37 | 60 |
| Avg Precip (In.) | .4 | .47 | 1.08 | 2.05 | 2.97 | 2.98 | 2.75 | 1.73 | 1.41 | 1.41 | .66 | .4 | 18.31 |