Altona, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.7 °F (low) to 53.4 °F (high). Annual precipitation averages 38.2 Inches. 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 | 7.6 °F | 26.0 °F | 2.43 in. |
| February | 9.8 °F | 28.0 °F | 1.97 in. |
| March | 19.6 °F | 37.2 °F | 2.41 in. |
| April | 32.4 °F | 51.7 °F | 3.09 in. |
| May | 44.4 °F | 65.3 °F | 3.43 in. |
| June | 53.9 °F | 74.0 °F | 4.22 in. |
| July | 59.3 °F | 78.7 °F | 3.92 in. |
| August | 57.3 °F | 77.1 °F | 3.76 in. |
| September | 49.4 °F | 70.1 °F | 3.39 in. |
| October | 38.6 °F | 56.4 °F | 3.94 in. |
| November | 28.2 °F | 44.1 °F | 2.85 in. |
| December | 16.3 °F | 31.9 °F | 2.79 in. |
| Annual | 34.7 °F | 53.4 °F | 38.2 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |