| 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 |
| 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: | 57d - Marblehead Drift/Limestone Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 44883 - Tiffin, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 19 | 28 | 38 | 49 | 59 | 63 | 60 | 53 | 41 | 33 | 23 | 40 |
| Avg Max Temp (°F) | 32 | 36 | 47 | 59 | 71 | 80 | 84 | 82 | 76 | 63 | 49 | 37 | 60 |
| Avg Precip (In.) | 2.28 | 1.98 | 2.69 | 3.38 | 3.79 | 4.13 | 3.45 | 3.86 | 3.21 | 2.39 | 2.97 | 2.92 | 37.06 |