The Hebrew year was sacred and civil, with two beginnings
The sacred year began with the month Abib, April, the civil with the month Tisri, October. The months were lunar, twelve in number, with, of course, the necessary intercalary month ve-adar at the proper time, about every three years. As divided by seasons, the year was solar. There were two seasons, summer and winter (Psa. 74:1717Thou hast set all the borders of the earth: thou hast made summer and winter. (Psalm 74:17); Jer. 36:2222Now the king sat in the winterhouse in the ninth month: and there was a fire on the hearth burning before him. (Jeremiah 36:22); Amos 3:1515And I will smite the winter house with the summer house; and the houses of ivory shall perish, and the great houses shall have an end, saith the Lord. (Amos 3:15); Zech. 14:88And it shall be in that day, that living waters shall go out from Jerusalem; half of them toward the former sea, and half of them toward the hinder sea: in summer and in winter shall it be. (Zechariah 14:8)).