However, this depends on the weather and climate, and there are some years in which visibility is better during December and some years in which January is the prime month. That's why it is said that winter, including both December and January, is the best time of the year to see the mountain.

Yes, December is actually considered one of the best months to visit Mount Fuji for sightseeing and photography. Because the air in winter is extremely dry and crisp, the visibility is at its highest, meaning you have the best chance of seeing the iconic snow-capped peak without it being obscured by clouds. Popular viewing spots like Lake Kawaguchiko and Hakone offer stunning vistas of the "Diamond Fuji" (the sun setting behind the peak) during this time. While you cannot climb to the summit in December—the climbing season is strictly limited to July and August for safety—you can still visit the "5th Station" via the Subaru Line if road conditions allow. December travelers should be prepared for cold, breezy weather with temperatures ranging from 3°C to 10°C (38°F–50°F). Winter festivals, such as the illumination displays at Lake Yamanakako and the early winter fireworks at Lake Kawaguchi, add a festive atmosphere to the region, making it a serene and beautiful "winter wonderland" experience for those who don't mind the chilly temperatures.