North Valley Stream, New York has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.2 °C (low) to 17.1 °C (high). Annual precipitation averages 1237.8 Millimeters. North 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 | 4.6 °C | 96.01 mm |
| February | -2.5 °C | 5.7 °C | 75.95 mm |
| March | 0.8 °C | 9.5 °C | 113.54 mm |
| April | 6 °C | 15.7 °C | 102.36 mm |
| May | 11.2 °C | 21 °C | 100.58 mm |
| June | 16.6 °C | 26.2 °C | 111.51 mm |
| July | 20.1 °C | 29.3 °C | 108.46 mm |
| August | 19.5 °C | 28.6 °C | 113.79 mm |
| September | 15.7 °C | 25 °C | 101.35 mm |
| October | 9.5 °C | 18.7 °C | 118.62 mm |
| November | 4.3 °C | 12.8 °C | 85.6 mm |
| December | 0.2 °C | 7.5 °C | 109.98 mm |
| Annual | 8.2 °C | 17.1 °C | 1237.75 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |