Guilford, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.3 °F (low) to 56.1 °F (high). Annual precipitation averages 47.8 Inches. Guilford is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.1 °F | 30.7 °F | 3.31 in. |
| February | 13.2 °F | 33.1 °F | 2.86 in. |
| March | 19.5 °F | 41.1 °F | 3.69 in. |
| April | 30.4 °F | 55.1 °F | 4.13 in. |
| May | 41.6 °F | 67.8 °F | 3.99 in. |
| June | 51.1 °F | 74.8 °F | 4.84 in. |
| July | 57.9 °F | 78.9 °F | 4.67 in. |
| August | 53.9 °F | 78.7 °F | 4.58 in. |
| September | 47.5 °F | 72.3 °F | 4.17 in. |
| October | 37.3 °F | 59.0 °F | 4.32 in. |
| November | 27.8 °F | 46.4 °F | 3.64 in. |
| December | 19.8 °F | 35.5 °F | 3.56 in. |
| Annual | 34.3 °F | 56.1 °F | 47.76 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |