Kisaragi is a traditional name for February in the Japanese calendar

Japanese calendar

On January 1, 1873, Japan adopted the Gregorian calendar. Before 1873, the Chinese style lunisolar calendar had been in use since 7th century. Japanese eras are still in use.-System:...

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The meaning of "kisaragi" is not so deep as those of the other names of the months. It is written as "wear more clothes" in kanji

Kanji

Kanji are the adopted logographic Chinese characters hanzi that are used in the modern Japanese writing system along with hiragana , katakana , Indo Arabic numerals, and the occasional use of the Latin alphabet...

; it also means "the rehabilitation of plants." In the lunar calendar

Lunar calendar

A lunar calendar is a calendar that is based on cycles of the lunar phase. A common purely lunar calendar is the Islamic calendar or Hijri calendar. A feature of the Islamic calendar is that a year is always 12 months, so the months are not linked with the seasons and drift each solar year by 11 to...

, which was used until the Heian Period

Heian period

The is the last division of classical Japanese history, running from 794 to 1185. The period is named after the capital city of Heian-kyō, or modern Kyōto. It is the period in Japanese history when Buddhism, Taoism and other Chinese influences were at their height...

, February was the second month of winter; January, February, March made up winter, and the three months starting from April were considered spring.