Korea has a temperate climate with comparatively fewer typhoons than other countries in East Asia. Due to the peninsula's position, it has a unique climate influenced by Siberia in the north, the Pacific Ocean in the east and the rest of Eurasia in the west. The peninsula has four distinct seasons: spring, summer, autumn and winter.
As influence from Siberia weakens, temperatures begin to increase while the high pressure begins to move away. If the weather is abnormally dry, Siberia will have more influence on the peninsula leading to wintry weather such as snow.
During June at the start of the summer, there tends to be a lot of rain due to the cold and wet air from the Sea of Okhotsk and the hot and humid air from the Pacific Ocean combining. When these fronts combine, it leads to a so-called rainy season with often cloudy days with rain, which is sometimes very heavy. The hot and humid winds from the south west blow causing an increasing amount of humidity and this leads to the fronts moving towards Manchuria in China and thus there is less rain and this is known as midsummer; temperatures can exceed 30 °C (86 °F) daily at this time of year.
Usually, high pressure is heavily dominant during autumn leading to clear conditions. Furthermore, temperatures remain high but the humidity becomes relatively low.
The weather becomes increasingly dominated by Siberia during winter and the jet stream moves further south causing a drop in temperature. This season is relatively dry with some snow falling at times.
South Korea tends to have a humid continental climate and a humid subtropical climate, and is affected by the East Asian monsoon, with precipitation heavier in summer during a short rainy season called jangma (장마), which begins end of June through the end of July.
Winters can be extremely cold with the minimum temperature dropping below −20 °C (−4 °F) in the inland region of the country: in Seoul, the average January temperature range is −7 to 1 °C (19 to 34 °F), and the average August temperature range is 22 to 30 °C (72 to 86 °F). Winter temperatures are higher along the southern coast and considerably lower in the mountainous interior.
Summer can be uncomfortably hot and humid, with temperatures exceeding 30 °C (86 °F) in most parts of the country. South Korea has four distinct seasons; spring, summer, autumn and winter.
Spring usually lasts from late March to early May, summer from mid-May to early September, autumn from mid-September to early November, and winter from mid-November to mid-March.