Willowbrook, in California, United States, is home to roughly 36,000 people in the Pacific Time Zone at 33.9°N latitude.
In 2025, Willowbrook recorded an average annual temperature of 63°F — about 2.3°F below the 30-year normal of 66°F. The hottest day reached 98°F in August; the coldest was 38°F in January. Total precipitation was 21 inches (wetter than usual). The wettest month was November.
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