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In page Shiogama:

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Shiogama has a humid climate (Köppen climate classification Cfa) characterized by mild summers and cold winters. The average annual temperature in Shiogama is 12.1 °C. The average annual rainfall is 1225 mm with September as the wettest month. The temperatures are highest on average in August, at around 24.6 °C, and lowest in January, at around 0.8 °C.[1]