Yes the fourth month is April
in December
October 21
Officially, winter begins with the Winter Solstice on December 21.
Winter begins on or about June 21 in the southern hemisphere.
March
October 1
spring and autumn begin midway between the two solstices. these are the aquinoxes.
October 1
Traditionally it has been the month of September.
Winter, because January is the first month of the year, and January is in the winter. It also ends in winter because December is the same way.
August