| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F | |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| Average Last Frost Date: | Apr. 21 - Apr. 30 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 52b - Paleozoic Plateau/Coulee Section | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 52002 - Dubuque, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 9 | 14 | 26 | 38 | 49 | 59 | 63 | 61 | 52 | 41 | 28 | 15 | 38 |
| Avg Max Temp (°F) | 26 | 32 | 44 | 58 | 70 | 80 | 84 | 81 | 73 | 61 | 44 | 31 | 57 |
| Avg Precip (In.) | 1.19 | 1.22 | 2.31 | 3.4 | 3.93 | 4.34 | 4.03 | 4.44 | 3.58 | 2.45 | 2.44 | 1.56 | 34.89 |