Dannemora, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.6 °C (low) to 11.4 °C (high). Annual precipitation averages 1101.1 Millimeters. Dannemora is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.1 °C | -3.2 °C | 71.37 mm |
| February | -11.7 °C | -1.6 °C | 59.94 mm |
| March | -6.7 °C | 3.2 °C | 69.34 mm |
| April | 0.2 °C | 10.4 °C | 91.69 mm |
| May | 7.3 °C | 17.8 °C | 99.57 mm |
| June | 12.2 °C | 22.4 °C | 121.16 mm |
| July | 14.8 °C | 25 °C | 104.65 mm |
| August | 13.9 °C | 24.1 °C | 103.89 mm |
| September | 9.8 °C | 20.4 °C | 100.33 mm |
| October | 3.9 °C | 13 °C | 121.16 mm |
| November | -2.5 °C | 5.9 °C | 80.52 mm |
| December | -9 °C | -0.2 °C | 77.47 mm |
| Annual | 1.6 °C | 11.4 °C | 1101.09 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°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 |