Chateaugay, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.5 °C (low) to 11.6 °C (high). Annual precipitation averages 1118.9 Millimeters. Chateaugay is located in USDA Plant Hardiness Zone 5a. 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 | -13.7 °C | -3.7 °C | 77.22 mm |
| February | -12.5 °C | -2.4 °C | 62.23 mm |
| March | -7.1 °C | 2.4 °C | 70.1 mm |
| April | 0.3 °C | 10.9 °C | 93.22 mm |
| May | 7.3 °C | 18.4 °C | 97.28 mm |
| June | 12.3 °C | 23.3 °C | 119.13 mm |
| July | 15 °C | 25.7 °C | 107.7 mm |
| August | 13.8 °C | 24.8 °C | 110.74 mm |
| September | 9.7 °C | 20.9 °C | 100.84 mm |
| October | 3.9 °C | 13.3 °C | 112.27 mm |
| November | -2.3 °C | 6.3 °C | 83.57 mm |
| December | -9.1 °C | -0.5 °C | 84.58 mm |
| Annual | 1.5 °C | 11.6 °C | 1118.88 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |