Thendara, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.6 °C (low) to 11.2 °C (high). Annual precipitation averages 1298.2 Millimeters. Thendara is located in USDA Plant Hardiness Zone 4a. 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 | -15.1 °C | -3.3 °C | 109.47 mm |
| February | -14.6 °C | -1.7 °C | 84.07 mm |
| March | -9.8 °C | 2.8 °C | 83.82 mm |
| April | -1.9 °C | 10.2 °C | 97.54 mm |
| May | 4.8 °C | 17.9 °C | 111.51 mm |
| June | 10.1 °C | 22.1 °C | 120.9 mm |
| July | 12.4 °C | 24.3 °C | 107.19 mm |
| August | 11.6 °C | 23.8 °C | 112.52 mm |
| September | 7.6 °C | 20.1 °C | 107.19 mm |
| October | 1.6 °C | 12.8 °C | 137.92 mm |
| November | -3.9 °C | 5.7 °C | 112.52 mm |
| December | -10.3 °C | -0.5 °C | 113.54 mm |
| Annual | -0.6 °C | 11.2 °C | 1298.19 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |