Winters are very harsh, summers are very hot and occasionally rainy due to the humid black climate prevailing in Montreal. Between December and April, the city is generally under snow. In addition, the temperature can drop to around -40 degrees in winter. For this reason, it is not recommended to make touristic trips to the city in the winter months. Montreal also has an underground city for use in the cold winter months. The average temperature of the city is around 20 degrees in the summer. As the festival times coincide with the summer months, these times are generally preferred for touristic trips.