From around early June to mid-July, as spring gives way to summer, most of Japan is subject to a period of rainy weather called tsuyu. Day in and day out, the sky remains gloomy, and temperatures and humidity rise. It is probably the least pleasant time of the year. Food spoils easily, and sunshine is so scarce that a small patch of blue peeping from between the clouds can brighten up one's spirits. Many innovations have been developed in Japan to cope with the wet, muggy weather. Traditional wooden Japanese homes are raised above the ground to keep the heat and humidity away and have few walls to facilitate ventilation. Many people live in Western-style homes and concrete apartment buildings these days. Consequently, people are relying more heavily on heating, cooling, and dehumidifying equipment. Kids are often prevented from going outside to play during the rainy season and get bored easily. While in school, they pass the time by playing indoor games during recess, and physical education classes are held in the gymnasium. After the pool season starts, swimming classes are held even in the rain, as long as it's not too cold. The early summer rain has many positive aspects, of course. It helps plants grow and flourish, and it's a valuable source of drinking water. Insufficient rainfall during tsuyu usually means water shortages in mid-summer. The fact that mold grows easily in humid weather is a big plus in making certain foods, such as miso, soy sauce, and sake, which are important parts of the Japanese diet.

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