Valley Stream, New York has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.3 °C (low) to 16.9 °C (high). Annual precipitation averages 1231.4 Millimeters. Valley Stream is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.1 °C | 4.5 °C | 95.76 mm |
| February | -2.4 °C | 5.7 °C | 75.18 mm |
| March | 0.9 °C | 9.4 °C | 114.3 mm |
| April | 6.1 °C | 15.5 °C | 102.62 mm |
| May | 11.3 °C | 20.8 °C | 100.08 mm |
| June | 16.8 °C | 25.9 °C | 110.49 mm |
| July | 20.2 °C | 29.2 °C | 106.68 mm |
| August | 19.7 °C | 28.3 °C | 112.78 mm |
| September | 15.9 °C | 24.8 °C | 99.31 mm |
| October | 9.7 °C | 18.6 °C | 118.62 mm |
| November | 4.4 °C | 12.7 °C | 86.11 mm |
| December | 0.3 °C | 7.5 °C | 109.47 mm |
| Annual | 8.3 °C | 16.9 °C | 1231.4 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |