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This study investigates the secular change of monthly, seasonal and annual precipitation, and the change of the monthly precipitation by each weather factor in Nagano prefecture. The weather factors are cyclone, trough, front, typhoon, winter monsoon type pressure pattern, the instability of atmosphere, the other factor and the precipitation of total factors. The secular change of precipitation, which reaches a synthesis time series, increases or decreases repeating periodic variation regularly or irregularly. The monthly change of precipitation expresses well the characteristic of precipitation by each weather factor. Besides it is known that the cyclone, the front and the typhoon have a lot of precipitation from the monthly change. The result obtained is very important for a future water resources project in Nagano prefecture.

SECULAR AND MONTHLY CHANGE OF PRECIPITATION BY EACH WEATHER FACTOR IN NAGANO PREFECTURE