| 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. 21 - Oct. 31 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 83c - Ontario Lowlands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 13126 - Oswego, NY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 18 | 26 | 36 | 46 | 55 | 61 | 60 | 53 | 43 | 34 | 23 | 40 |
| Avg Max Temp (°F) | 31 | 33 | 41 | 53 | 66 | 75 | 80 | 78 | 71 | 59 | 47 | 36 | 56 |
| Avg Precip (In.) | 3.76 | 2.84 | 3.34 | 3.33 | 3.19 | 3.45 | 3.04 | 3.74 | 4.23 | 3.75 | 4.46 | 3.8 | 42.94 |