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The growth of the Pacific High in early spring begins to drive southwesterly winds across the Korean Peninsula, thwarting the southward advance of cold air out of Siberia. The continued dominance of the Pacific High over the region's weather ushers in Korea's monsoon season.
By April most weather systems turn more eastward from the Asian continent and move out to sea. High pressure and warm southeasterly ocean winds bring clearing skies and warmer temperatures to Korea.
By late spring, moisture-laden winds start blowing from the south, driving the relative humidity up from an average of 50% in April to a peak of 80% to 90% nationwide in July. Some southern cities such as Pusan and Cheju have as much as 406 mm of rainfall in the spring, adequate for preparing seedbeds for rice, for sowing spring vegetables, and for planting summer crops such as barley corn and soybeans. May is one of Korea's sunniest and most pleasant months.
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