| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F | |
| 2012 Hardiness Zone: | 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 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 47a - Loess Prairies | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 51246 - Rock Rapids, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 3 | 10 | 22 | 34 | 46 | 57 | 61 | 58 | 48 | 35 | 22 | 9 | 34 |
| Avg Max Temp (°F) | 24 | 30 | 42 | 58 | 71 | 81 | 85 | 83 | 74 | 61 | 42 | 28 | 56 |
| Avg Precip (In.) | .54 | .54 | 1.9 | 2.69 | 3.25 | 4.27 | 3.54 | 3.86 | 2.53 | 1.93 | 1.63 | .73 | 27.42 |