going back

In November, when it is too cold here in Denmark, I go back to Argentina again - and in May, when fall and winter comes to Argentina I go back to Denmark again - half a year in Denmark, half a year in Argentina, half a year in Denmark, half a year in Argentina - and so on ... just like the migratory birds.

Argentina has summer when Denmark has winter,
fall when Denmark has spring,
winter when Denmark has summer and
spring when Denmark has fall.

November in Argentina is like May in Denmark,
December in Argentina is like June in Denmark,
January in Argentina is like July in Denmark,
February in Argentina is like August in Denmark,
March in Argentina is like September in Denmark,
April in Argentina is like October in Denmark,
May in Argentina is like November in Denmark,
June in Argentina is like December in Denmark,
July in Argentina is like January in Denmark,
August in Argentina is like February in Denmark,
September in Argentina is like March in Denmark
and
October in Argentina is like April in Denmark.

So - from November to April it is best to be in Argentina, and from May to October it is best to be in Denmark.