The summer climbing season, coming between rainy season in June and typhoon season in August, is a short one. It is said the last ten days in July present the most stable weather. Even in the best of weather, you can be almost guaranteed a shower in the mountains in the middle of the day, even if the rest of the country is seeing blue skies and sunshine.
One of the most popular routes to the summit of Okuhodaka-dake is through Yoko valley. With a wet, temperate climate, the tree line in the Japanese Alps is around 2,500m/8,200ft. Click on the image for a larger view.