| 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 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 44410 - Cortland, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 18 | 26 | 35 | 46 | 55 | 59 | 57 | 51 | 40 | 32 | 23 | 38 |
| Avg Max Temp (°F) | 33 | 37 | 47 | 59 | 70 | 78 | 82 | 81 | 74 | 62 | 50 | 38 | 59 |
| Avg Precip (In.) | 2.23 | 1.92 | 2.86 | 3.27 | 3.5 | 4.06 | 4.11 | 3.48 | 3.98 | 2.71 | 3.16 | 2.83 | 38.1 |