Even at midsummer, the temperature of Mt.Fuji is sometimes below freezing, so it is not unusual for snow to fall. Therefore, it is very difficult to distinguish between the first snow and the last snow. The snow just before the highest temperature of the year is the last snow, and the snow just after that is the first snow in the year. If you think that it is the first snow, the maximum temperature will be updated after that, and the first snow may become the last snow. By the way, the first snow-capped Fuji refers to the condition where part of the mountaintop looks white after the above “highest temperature day” observed from the Yamanashi Meteorological Observatory.

富士山頂は真夏でも気温が氷点下になる日があり、いつ雪が降ってもおかしくない環境にあります。だから、初雪と終雪の区別をつけるのがとても難しいのです。一年の最高気温の手前で最後に降った雪が終雪、後で初めて降った雪が初雪となります。初雪だと思っていたら、その後に最高気温が更新され、初雪が終雪になることもあります。一方、初冠雪とは、山梨気象台から観測して、上記の「最高気温日」以降で、「山頂の一部が白色に見える状態」を言います。