Herkimer, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.8 °C (low) to 14.5 °C (high). Annual precipitation averages 1137.9 Millimeters. Herkimer is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.5 °C | -0.6 °C | 71.12 mm |
| February | -8.8 °C | 0.9 °C | 61.98 mm |
| March | -4.4 °C | 5.5 °C | 75.44 mm |
| April | 2.1 °C | 13.9 °C | 98.3 mm |
| May | 8.4 °C | 21.3 °C | 97.28 mm |
| June | 13.8 °C | 26 °C | 116.33 mm |
| July | 16.4 °C | 28.6 °C | 121.92 mm |
| August | 15.7 °C | 27.6 °C | 111.76 mm |
| September | 11.6 °C | 23.6 °C | 103.38 mm |
| October | 5.4 °C | 16.1 °C | 111.51 mm |
| November | 0.2 °C | 8.7 °C | 90.17 mm |
| December | -5.2 °C | 2.4 °C | 78.74 mm |
| Annual | 3.8 °C | 14.5 °C | 1137.93 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°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 |