With a population of around 15,100, Adelphi sits in Maryland, United States. The city operates in the Eastern Time Zone.
In 2025, Adelphi recorded an average annual temperature of 56°F. The hottest temperatures reached 101°F in June; the coolest were 7°F in January. Total precipitation for the year was 50 inches, with the wettest month being May. Snowfall for the year totaled approximately 7 inches.
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