| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 72b - Glaciated Wabash Lowlands |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 47501 - Washington, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 22 | 26 | 35 | 44 | 54 | 63 | 67 | 65 | 58 | 46 | 37 | 27 | 45 |
| Avg Max Temp (°F) | 38 | 44 | 55 | 67 | 76 | 85 | 88 | 86 | 80 | 69 | 55 | 43 | 65 |
| Avg Precip (In.) | 2.8 | 2.72 | 4.13 | 4.24 | 5.43 | 4.13 | 4.81 | 3.84 | 2.96 | 3.09 | 4.28 | 3.41 | 45.84 |