| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 54a - Illinois/Indiana Prairies |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 46385 - Valparaiso, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 19 | 28 | 38 | 48 | 58 | 63 | 61 | 53 | 42 | 32 | 21 | 40 |
| Avg Max Temp (°F) | 30 | 36 | 47 | 59 | 71 | 80 | 83 | 81 | 75 | 63 | 48 | 35 | 59 |
| Avg Precip (In.) | 1.96 | 1.68 | 2.84 | 3.66 | 3.91 | 4.55 | 3.86 | 3.83 | 3.63 | 3.05 | 3.44 | 2.74 | 39.15 |