| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°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: | 47e - Steeply Rolling Loess Prairies | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 50022 - Atlantic, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 15 | 26 | 38 | 49 | 59 | 63 | 61 | 52 | 40 | 27 | 15 | 38 |
| Avg Max Temp (°F) | 29 | 35 | 48 | 62 | 73 | 82 | 85 | 83 | 76 | 64 | 46 | 32 | 60 |
| Avg Precip (In.) | .84 | .94 | 2.33 | 3.44 | 4.34 | 4.89 | 4.53 | 3.75 | 3.81 | 2.68 | 1.82 | 1.1 | 34.46 |