| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 2012 Hardiness Zone: | Zone 4b: -25°F to -20°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 83d - St. Lawrence Lowlands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 13669 - Ogdensburg, NY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 6 | 8 | 20 | 33 | 46 | 54 | 60 | 57 | 49 | 38 | 29 | 15 | 35 |
| Avg Max Temp (°F) | 25 | 28 | 39 | 52 | 66 | 76 | 81 | 78 | 69 | 57 | 44 | 31 | 54 |
| Avg Precip (In.) | 2.5 | 2.03 | 2.22 | 2.78 | 2.88 | 3.18 | 3.16 | 3.66 | 3.88 | 2.99 | 3.16 | 2.74 | 35.19 |