Oswegatchie, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.3 °F (low) to 54.4 °F (high). Annual precipitation averages 38.3 Inches. Oswegatchie is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.3 °F | 26.2 °F | 2.9 in. |
| February | 10.4 °F | 28.8 °F | 2.36 in. |
| March | 20.8 °F | 37.8 °F | 2.5 in. |
| April | 34.4 °F | 52.8 °F | 3.2 in. |
| May | 46.2 °F | 66.3 °F | 3.19 in. |
| June | 55.8 °F | 75.0 °F | 3.54 in. |
| July | 60.7 °F | 79.8 °F | 3.6 in. |
| August | 58.7 °F | 78.7 °F | 3.33 in. |
| September | 50.8 °F | 71.4 °F | 3.5 in. |
| October | 40.2 °F | 57.6 °F | 3.88 in. |
| November | 29.8 °F | 45.1 °F | 3.12 in. |
| December | 18.2 °F | 32.8 °F | 3.13 in. |
| Annual | 36.3 °F | 54.4 °F | 38.25 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |