Lake Ronkonkoma, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.7 °F (low) to 61.4 °F (high). Annual precipitation averages 50.8 Inches. Lake Ronkonkoma is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.9 °F | 39.4 °F | 3.96 in. |
| February | 25.0 °F | 41.1 °F | 3.58 in. |
| March | 31.4 °F | 47.9 °F | 5.06 in. |
| April | 40.6 °F | 58.9 °F | 4.38 in. |
| May | 50.5 °F | 68.8 °F | 3.96 in. |
| June | 60.3 °F | 77.6 °F | 4.41 in. |
| July | 66.5 °F | 83.1 °F | 3.41 in. |
| August | 65.3 °F | 81.6 °F | 4.15 in. |
| September | 58.6 °F | 75.2 °F | 4.03 in. |
| October | 47.5 °F | 64.1 °F | 4.98 in. |
| November | 37.3 °F | 53.7 °F | 3.8 in. |
| December | 29.8 °F | 44.8 °F | 5.08 in. |
| Annual | 44.7 °F | 61.4 °F | 50.8 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |