With a population of around 14,400, Brookside sits in Delaware, United States. The city operates in the Eastern Time Zone.
In 2025, Brookside recorded an average annual temperature of 55°F — about 0.7°F below the 30-year normal of 56°F. The hottest day reached 98°F in June; the coldest was 6°F in January. Total precipitation was 42 inches (drier than usual). Snowfall totaled 5 inches, below the 20-inch average. The wettest month was May.
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