| 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 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 61b - Mosquito Creek/Pymatuning Lowlands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 44047 - Jefferson, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 17 | 25 | 35 | 45 | 54 | 59 | 57 | 50 | 40 | 32 | 23 | 38 |
| Avg Max Temp (°F) | 32 | 35 | 45 | 57 | 68 | 77 | 81 | 80 | 73 | 62 | 49 | 38 | 58 |
| Avg Precip (In.) | 2.51 | 2.18 | 2.97 | 3.52 | 3.54 | 4.44 | 4.05 | 4.06 | 4.22 | 3.74 | 3.77 | 3.26 | 42.26 |