With a population of around 30,900, Radnor sits in Pennsylvania, United States. The city operates in the Eastern Time Zone.
In 2025, Radnor recorded an average annual temperature of 54°F — about 1.9°F below the 30-year normal of 56°F. The hottest day reached 100°F in June; the coldest was 4°F in January. Total precipitation was 40 inches (drier than usual). Snowfall totaled 5 inches, below the 23-inch average. The wettest month was May.
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