The zone of variable winds is gradually replaced by an area of prevailing westerlies north ci about latitude 35 °N. These are not so boisterous as the westerlies of the Southern Ocean and the northern limit of the variables is more difficult to define. Westerly winds are more reliable both in direction and strength during the winter months, but this is hardly the time when anyone would consider cruising in the higher latitudes of the North Pacific, where the weather is very rough. In summer the weather is more benign, when fewer depressions race across the North Pacific between Japan and Alaska. The best weather can be expected in July, when light to moderate westerly winds predominate north of latitude 40 °N.
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