Clarendon, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.3 °C (low) to 14.1 °C (high). Annual precipitation averages 833.4 Millimeters. Clarendon is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.9 °C | 0.4 °C | 57.66 mm |
| February | -7.7 °C | 1.2 °C | 46.23 mm |
| March | -3.7 °C | 5.7 °C | 60.45 mm |
| April | 2.1 °C | 13.2 °C | 74.42 mm |
| May | 8.4 °C | 20.1 °C | 75.44 mm |
| June | 13.8 °C | 24.9 °C | 78.99 mm |
| July | 16.4 °C | 27.1 °C | 80.26 mm |
| August | 15.7 °C | 26.3 °C | 71.88 mm |
| September | 11.8 °C | 22.7 °C | 78.23 mm |
| October | 6.1 °C | 15.8 °C | 82.55 mm |
| November | 0.6 °C | 9.1 °C | 64.01 mm |
| December | -4.2 °C | 3.2 °C | 63.25 mm |
| Annual | 4.3 °C | 14.1 °C | 833.37 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |