SvanbergaSvanberga is a locality in Norrtälje Municipality, Stockholm County, Sweden. It is situated about north of downtown Norrtälje, and on the eastern shore of the lake. It had 501 inhabitants in 2010.ClimateSvanberga has a humid continental climate. It is located in a frost hollow and is prone to very cold temperatures in winter, often in brief spells, with highly variable patterns. In spring air frosts linger on until early May, while summer highs are quite warm.