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Seasonal and secular variations of sunshine duration and natural seasons in Japan

Seasonal transitions of sunshine duration and their secular changes in Japan are investigated for the period 1951–2000, and the influence of climatic variations on seasonal weather tendencies is discussed. Two seasons with little sunshine in the Baiu and the Akisame seasons are recognized in central and western Japan (CW Japan). In northern Japan, however, only one season with little sunshine in summer is seen. Another season with little sunshine is recognized for the Sea of Japan side and the Southwest Islands during the winter monsoon season.