Hartwick, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.7 °C (low) to 13.6 °C (high). Annual precipitation averages 1172 Millimeters. Hartwick 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 | -10.7 °C | -0.5 °C | 81.79 mm |
| February | -10.2 °C | 1 °C | 64.26 mm |
| March | -6.3 °C | 5.4 °C | 88.14 mm |
| April | -0.1 °C | 13.1 °C | 102.87 mm |
| May | 6.1 °C | 20 °C | 98.04 mm |
| June | 11.2 °C | 24.1 °C | 128.27 mm |
| July | 13.7 °C | 26.4 °C | 115.32 mm |
| August | 12.9 °C | 25.7 °C | 115.06 mm |
| September | 8.9 °C | 22 °C | 98.55 mm |
| October | 3.3 °C | 15.2 °C | 103.38 mm |
| November | -1.9 °C | 8.1 °C | 85.09 mm |
| December | -6.4 °C | 2.2 °C | 91.19 mm |
| Annual | 1.7 °C | 13.6 °C | 1171.96 mm |
| 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 : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |