| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| 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: | 71a - Crawford-Mammoth Cave Uplands |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 47460 - Spencer, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 20 | 29 | 38 | 48 | 58 | 62 | 60 | 52 | 39 | 31 | 22 | 40 |
| Avg Max Temp (°F) | 35 | 41 | 51 | 63 | 73 | 81 | 85 | 83 | 77 | 66 | 52 | 40 | 62 |
| Avg Precip (In.) | 2.57 | 2.59 | 3.73 | 4.34 | 4.97 | 4.53 | 4.62 | 4.43 | 3.25 | 3.09 | 4.03 | 3.31 | 45.46 |