Rockville Centre, New York has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.3 °C (low) to 16.7 °C (high). Annual precipitation averages 1244.1 Millimeters. Rockville Centre is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.1 °C | 4.3 °C | 96.27 mm |
| February | -2.5 °C | 5.4 °C | 75.18 mm |
| March | 0.8 °C | 9.1 °C | 115.57 mm |
| April | 6 °C | 15.3 °C | 103.63 mm |
| May | 11.3 °C | 20.7 °C | 101.85 mm |
| June | 16.7 °C | 25.7 °C | 113.28 mm |
| July | 20.1 °C | 28.9 °C | 108.46 mm |
| August | 19.6 °C | 28.3 °C | 112.52 mm |
| September | 15.9 °C | 24.8 °C | 101.35 mm |
| October | 9.9 °C | 18.4 °C | 120.65 mm |
| November | 4.5 °C | 12.5 °C | 87.12 mm |
| December | 0.2 °C | 7.3 °C | 108.2 mm |
| Annual | 8.3 °C | 16.7 °C | 1244.08 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| 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 |