School should be closed in the winter and open in the summer in countries that get snow

In Canada, where I am from, we get snow days (no school day) when the weather doesn't permit safe travel for children and buses etc. Meanwhile, the most favourable weather months of the year; schools are closed.

School being closed in summer was historically based on children required at the farm. Any curriculum planning done over the summer break/registration could all be done in the winter months.