Guilderland, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.1 °F (low) to 58.2 °F (high). Annual precipitation averages 42.9 Inches. Guilderland 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 | 31.9 °F | 2.72 in. |
| February | 16.7 °F | 34.9 °F | 2.43 in. |
| March | 25.1 °F | 43.7 °F | 3.33 in. |
| April | 36.6 °F | 57.7 °F | 3.48 in. |
| May | 48.1 °F | 69.6 °F | 3.62 in. |
| June | 57.3 °F | 77.9 °F | 4.53 in. |
| July | 62.0 °F | 82.6 °F | 4.55 in. |
| August | 60.5 °F | 80.7 °F | 3.96 in. |
| September | 52.5 °F | 73.5 °F | 3.58 in. |
| October | 41.2 °F | 60.6 °F | 4.39 in. |
| November | 31.2 °F | 48.4 °F | 2.76 in. |
| December | 22.5 °F | 37.2 °F | 3.52 in. |
| Annual | 39.1 °F | 58.2 °F | 42.87 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |