URL: http://www.tourism-heidelberg.com/e105/e193/e1188/index_eng.html
Heidelberg's climate is relatively mild, with lows ranging from 29°F (1.5°C) to 57°F (14°C) and highs between 38°F (3°C) and 77°F (25°F). Average rainfall is around 2.5 inches (6.3 cm).
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