Grahamsville, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.5 °F (low) to 58 °F (high). Annual precipitation averages 50.3 Inches. Grahamsville is located in USDA Plant Hardiness Zone 6a. 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 | 15.4 °F | 32.7 °F | 3.43 in. |
| February | 16.7 °F | 35.9 °F | 2.79 in. |
| March | 24.4 °F | 44.1 °F | 3.59 in. |
| April | 35.0 °F | 57.5 °F | 3.61 in. |
| May | 45.3 °F | 68.5 °F | 4.19 in. |
| June | 54.6 °F | 76.9 °F | 5.18 in. |
| July | 59.3 °F | 81.7 °F | 5.25 in. |
| August | 57.6 °F | 79.7 °F | 4.51 in. |
| September | 50.5 °F | 72.7 °F | 4.96 in. |
| October | 39.3 °F | 60.5 °F | 4.88 in. |
| November | 30.0 °F | 48.5 °F | 3.75 in. |
| December | 21.8 °F | 37.5 °F | 4.13 in. |
| Annual | 37.5 °F | 58 °F | 50.27 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |