| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F | |
| 2012 Hardiness Zone: | 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 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 57039 - Lennox, SD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 5 | 12 | 23 | 35 | 47 | 57 | 61 | 59 | 49 | 36 | 23 | 10 | 35 |
| Avg Max Temp (°F) | 26 | 32 | 44 | 60 | 72 | 81 | 86 | 83 | 75 | 62 | 43 | 29 | 58 |
| Avg Precip (In.) | .45 | .53 | 1.67 | 2.62 | 3.31 | 3.73 | 3.18 | 3.1 | 2.41 | 1.88 | 1.36 | .57 | 24.82 |