Spencer, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2 °C (low) to 14.3 °C (high). Annual precipitation averages 1009.7 Millimeters. Spencer 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 | -9.9 °C | 0.1 °C | 62.74 mm |
| February | -9.6 °C | 1.4 °C | 54.1 mm |
| March | -5.6 °C | 5.8 °C | 79.76 mm |
| April | 0.2 °C | 13.6 °C | 88.9 mm |
| May | 6.3 °C | 20.6 °C | 82.8 mm |
| June | 11.5 °C | 25.1 °C | 107.19 mm |
| July | 13.8 °C | 27.4 °C | 100.58 mm |
| August | 13.1 °C | 26.8 °C | 94.74 mm |
| September | 9.2 °C | 22.8 °C | 102.87 mm |
| October | 3.2 °C | 15.8 °C | 92.46 mm |
| November | -1.8 °C | 8.8 °C | 70.87 mm |
| December | -6.1 °C | 2.8 °C | 72.64 mm |
| Annual | 2 °C | 14.3 °C | 1009.65 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |