With a population of around 20,200, Lake Ronkonkoma sits in New York, United States. The city operates in the Eastern Time Zone.
In 2025, Lake Ronkonkoma recorded an average annual temperature of 53°F — right at the 30-year normal of 53°F. The hottest day reached 100°F in June; the coldest was 7°F in January. Total precipitation was 45 inches (near normal). Snowfall totaled 8 inches, below the 32-inch average. The wettest month was May.
View current conditions and forecast for Lake Ronkonkoma · More cities in New York