The same effect is well shown by the linguiform isotherms. In January, for example, the isotherm of 14°, after skirting the north coast of the Scandinavian peninsula, turns southward along the Keel, crossing the upper part of the district of the great northern lakes.
In July, on the other hand, the isotherms show an almost constant temperature all over the country, and the linguiform curves are wanting.
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