Rotterdam, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.9 °C (low) to 14.5 °C (high). Annual precipitation averages 1079 Millimeters. Rotterdam is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.2 °C | -0.1 °C | 72.39 mm |
| February | -8.6 °C | 1.5 °C | 63.5 mm |
| March | -3.9 °C | 6.4 °C | 77.72 mm |
| April | 2.4 °C | 14.2 °C | 86.61 mm |
| May | 8.9 °C | 20.8 °C | 90.68 mm |
| June | 14 °C | 25.4 °C | 114.05 mm |
| July | 16.6 °C | 28 °C | 111.25 mm |
| August | 15.8 °C | 26.9 °C | 110.74 mm |
| September | 11.4 °C | 22.9 °C | 88.9 mm |
| October | 5.1 °C | 15.8 °C | 111 mm |
| November | -0.4 °C | 9 °C | 70.36 mm |
| December | -5.3 °C | 2.8 °C | 81.79 mm |
| Annual | 3.9 °C | 14.5 °C | 1078.99 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |