富士山 森林限界以上は真冬。高山病と低体温症に警戒

Mount Fuji summit currently experiences severe winter conditions, with a temperature of -5.7°C and a feels-like temperature of -9.4°C. The temperature difference from the base is a significant -15.1°C, highlighting the drastic environmental change with altitude. Daytime temperatures will remain between -3°C and -4°C, with feels-like temperatures generally ranging from -5°C to -10°C. On the exposed slopes above the tree line, even moderate winds can cause a rapid drop in perceived temperature, necessitating rigorous cold weather protection.

Although the snow depth is reported as 0cm, sub-zero daytime temperatures mean that residual snow and icy patches are highly likely to persist, especially in shaded areas and depressions. While the steep volcanic scree slopes, such as those on the Yoshida Trail and during the summit crater traverse (Ochameguri), are primarily exposed rock, localized ice patches are anticipated in wind-sheltered spots and shaded sections. Carrying light crampons or microspikes is essential, and an ice axe is also recommended for fall prevention. For layering, wear a moisture-wicking base layer, insulating fleece or light down mid-layers, and a windproof, waterproof outer shell. Hand, foot, and head protection, including a balaclava, are indispensable.

The risk of lightning is low. While wind gusts are relatively mild at a maximum of 7.