Estimation of snowfall change and impact of agriculture in Japan

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The reduction trend was detected in the winter monsoon snowfall in the side of the Sea of Japan. The cause of snowfall reduction was changed precipitation form to rain by air temperature rise. The increase in the low pressure snowfall in the eastern Hokkaido was not detected statistically. Agricultural influence estimated snow coverage and soil frost depth in the Eastern Hokkaido Pacific Ocean side. The increase weeds are expected for reduction of soil frost depth. Maximum snow depth and snow coverage period recorded the greatest in Iwamizawa in 2011 to 2012 winter season. And there were much collapse of facilities, such as a pipe house, and branch crease damage of a fruit tree.