| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°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: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 47a - Loess Prairies | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 51031 - Le Mars, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 6 | 12 | 23 | 35 | 48 | 58 | 62 | 59 | 49 | 36 | 23 | 11 | 35 |
| Avg Max Temp (°F) | 26 | 33 | 46 | 61 | 73 | 83 | 86 | 84 | 76 | 64 | 44 | 30 | 59 |
| Avg Precip (In.) | .64 | .55 | 1.96 | 2.73 | 3.51 | 3.99 | 3.36 | 3.41 | 2.55 | 1.96 | 1.39 | .71 | 26.77 |