With a population of around 14,500, Hopatcong sits in New Jersey, United States. The city operates in the Eastern Time Zone.
In 2025, Hopatcong recorded an average annual temperature of 50°F. The hottest temperatures reached 93°F in June; the coolest were -1°F in January. Total precipitation for the year was 42 inches, with the wettest month being May. Snowfall for the year totaled approximately 11 inches.
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