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Mt.Fuji

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Natural Environment

Severity and gentleness in its climate

Temperature
The average monthly temperature at the summit of Mt. Fuji is below freezing for almost all months, other than for a period of time in the summer, and has an average annual temperature of approximately −7ºC. Even on days when the temperature of the flatlands surrounding Mt. Fuji are 30ºC, climbing to the 5th climbing station sees temperature drop to about 16ºC with the summit at a mere 7ºC. The temperatures at the summit of Mt. Fuji and the flatlands of Mishima maintain an average difference of 23ºC year round.
Wind
Strong winds are characteristic of the summit of Mt. Fuji with west-northwesterly and westerly winds blowing year round, with an average annual wind speed of 11 m/s. The fastest ever recorded instantaneous wind speed at the summit was 91.0 m/s, recorded on September 25, 1966, meanwhile the fastest ever recorded on flatlands was at Miyako Island measuring 85.3 m/s. Even during August, the month with the calmest winds, the average wind speed is 8.6 m/s. Given that with every 1 m/s increase in wind speed your body perceives the temperature to be 1℃ cooler, it can be said the strong winds at the summit are extremely harsh.
Clouds and Weather
When warm and humid air hits the mountain, the air rises along its slopes and condenses to form clouds. The clouds passing over the summit are called “capping clouds” while the clouds that have moved past the summit are called “hanging clouds” and according to legend are a sign of changing weather.
Sleeved capping cloud
Winged hanging cloud
Recently formed capping cloud at the summit
Hanging clouds and capping clouds of summer
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