Ganesh Chaturthi, also known as Vinayaka Chaturthi, is a Hindu festival celebrating the arrival of Ganesh to earth from Kailash Parvat with his mother Goddess Parvati/Gauri.
Winter is the coldest season of the year in polar and temperate zones (winter does not occur in most of the tropical zone). It occurs after autumn and before spring in each year. Winter is caused by the axis of the Earth in that hemisphere being oriented away from the Sun.
There are many Hindu religious festivals around the world. Festivals usually celebrate events in Hindu mythology, usually in line with seasonal changes.