South Korea has four distinct seasons. First of all
Spring, which begins in late March or early April.
The average temperatures of about 50°F–55°F/10°C–12°C, and brings considerable rainfall. Hot and rainy summers make the vegetation lush.
Monsoon season begins at the end of June and lasts until August. During this period of time, the temperatures in South Korea range from 68°F–86°F/20°C–30°C. Next one is
Autumn which is perhaps the most pleasant season; cool, dry air and a spectacular showing of foliage from September to November counter the languid humidity of the monsoon season.
Winters are cold and dry, and last from December to February.
So just select which season is the best for you then

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Credit:www.jobmonkey.com