日中は穏やか。午後から稜線に風が吹き体感は氷点下

Mount Ontake summit is clear this morning. As of 6:45 AM, the temperature is minus 4 degrees Celsius, with a perceived temperature of minus 8.4 degrees Celsius. There is a significant 9.1-degree difference from the base. While the temperature is forecast to rise to 3 degrees Celsius by noon, gusts are expected to reach 13.4 meters per second by 3 PM. The perceived temperature will drop near freezing during this period.

The trails are snow-free, with the white volcanic scree slopes above the treeline exposed. However, due to the cold mornings and evenings, rocky areas and depressions with residual snow may be frozen. It is wise to carry light crampons or microspikes, especially for shaded or north-facing sections where ice might persist. When approaching Kengamine peak, expect increased wind exposure in the afternoon, so adequate wind protection is crucial.

For layering, use a quick-drying base layer to manage sweat, a fleece or light down mid-layer for insulation, and a windproof and waterproof outer layer. Adjust layers frequently to regulate body temperature. Given Ontake's active volcano status, carrying a helmet is also recommended. Visibility is excellent, but be mindful of the decreasing perceived temperature and potential fatigue from afternoon winds, planning your ascent and descent with ample time.

Temperatures will drop back below freezing from evening into night, with the summit forecast to reach a low of minus 5 degrees Celsius. Prioritize descending during daylight hours, as post-sunset activity significantly increases the risk of hypothermia.