| 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. 1 - Oct. 10 | |
| Average Last Frost Date: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 47d - Missouri Alluvial Plain | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 51109 - Sioux City, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 9 | 15 | 26 | 37 | 50 | 59 | 64 | 61 | 51 | 39 | 25 | 13 | 37 |
| Avg Max Temp (°F) | 29 | 35 | 47 | 62 | 73 | 82 | 86 | 84 | 76 | 64 | 45 | 32 | 60 |
| Avg Precip (In.) | .62 | .66 | 2.12 | 2.93 | 4 | 3.85 | 3.51 | 3 | 2.56 | 2.11 | 1.55 | .8 | 27.7 |