| 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: | 47c - Iowan Surface | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 50702 - Waterloo, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 6 | 13 | 25 | 36 | 48 | 58 | 62 | 59 | 50 | 38 | 25 | 12 | 36 |
| Avg Max Temp (°F) | 25 | 31 | 44 | 59 | 72 | 81 | 84 | 82 | 75 | 62 | 44 | 30 | 58 |
| Avg Precip (In.) | .91 | 1.03 | 2.13 | 3.35 | 4.23 | 4.82 | 4.25 | 4.23 | 3.1 | 2.51 | 2.16 | 1.18 | 33.9 |