| 2023 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F | |
| 2012 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F | |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 46c - Glacial Lake Basins | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 57401 - Aberdeen, SD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 0 | 8 | 21 | 33 | 45 | 55 | 60 | 57 | 46 | 34 | 19 | 6 | 32 |
| Avg Max Temp (°F) | 21 | 28 | 40 | 57 | 70 | 79 | 85 | 84 | 73 | 59 | 39 | 26 | 55 |
| Avg Precip (In.) | .48 | .49 | 1.33 | 1.85 | 2.71 | 3.41 | 2.94 | 2.39 | 1.84 | 1.63 | .76 | .38 | 20.21 |