Altona, 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 11.9 °C (high). Annual precipitation averages 970.3 Millimeters. Altona 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.6 °C | -3.3 °C | 61.72 mm |
| February | -12.3 °C | -2.2 °C | 50.04 mm |
| March | -6.9 °C | 2.9 °C | 61.21 mm |
| April | 0.2 °C | 10.9 °C | 78.49 mm |
| May | 6.9 °C | 18.5 °C | 87.12 mm |
| June | 12.2 °C | 23.3 °C | 107.19 mm |
| July | 15.2 °C | 25.9 °C | 99.57 mm |
| August | 14.1 °C | 25.1 °C | 95.5 mm |
| September | 9.7 °C | 21.2 °C | 86.11 mm |
| October | 3.7 °C | 13.6 °C | 100.08 mm |
| November | -2.1 °C | 6.7 °C | 72.39 mm |
| December | -8.7 °C | -0.1 °C | 70.87 mm |
| Annual | 1.5 °C | 11.9 °C | 970.29 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |