Dannemora, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.9 °F (low) to 52.6 °F (high). Annual precipitation averages 43.4 Inches. 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 | 8.4 °F | 26.3 °F | 2.81 in. |
| February | 10.9 °F | 29.2 °F | 2.36 in. |
| March | 20.0 °F | 37.8 °F | 2.73 in. |
| April | 32.4 °F | 50.7 °F | 3.61 in. |
| May | 45.1 °F | 64.1 °F | 3.92 in. |
| June | 54.0 °F | 72.4 °F | 4.77 in. |
| July | 58.6 °F | 77.0 °F | 4.12 in. |
| August | 57.1 °F | 75.4 °F | 4.09 in. |
| September | 49.7 °F | 68.7 °F | 3.95 in. |
| October | 39.1 °F | 55.4 °F | 4.77 in. |
| November | 27.5 °F | 42.7 °F | 3.17 in. |
| December | 15.8 °F | 31.7 °F | 3.05 in. |
| Annual | 34.9 °F | 52.6 °F | 43.35 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |