Shevat

Shevat is the fifth month of the civil year starting in Tishre and the eleventh month of the ecclesiastical year on the Hebrew calendar starting in Nisan. It is a month of 30 days. Shevat usually occurs in January–February on the Gregorian calendar.
The name of the month was taken from the Akkadian language during the Babylonian Captivity. The assumed Akkadian origin of the month is Šabātu, meaning "strike", that refers to the heavy rains of the season.
In Biblical sources, the month is first mentioned by this name in the book of prophet Zechariah.

Holidays

15 Shevat – Tu Bishvat
In Jewish history and tradition
1 Shevat – Moses repeats the Torah
2 Shevat – Asher born
10 Shevat - Death of the Previous Rebbe, the 6th Chabad Rebbe.
17-18 Shevat — the minor Purim of Saragossa, where the Jews of Saragossa were saved from destruction at the hand of an informant.
24 Shevat – Zechariah's prophecy
28 Shevat – Antiochus V abandoned his siege of Jerusalem and his plans for the city's destruction. This day was observed as a holiday in Hasmonean times.