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In page Hainan:

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From January to February, the island of Hainan is often affected by thick fog, particularly in coastal areas and the northern part of the island. This is caused by cold winter air from the north coming into contact with the warmer sea, causing the moisture that evaporates from the sea to be condensed into fog. The fog remains from day to night, and is evenly distributed. Visibility may be reduced to 50 meters (160 ft) for days at a time. During this period, residents normally keep windows shut. The moisture in the air is so extreme that the walls in homes weep, and floors often accumulate a layer of water.[citation needed]