Russia, a city in some parts of Europe, has a temperate maritime climate with warm winters and cool summers, which is particularly comfortable and not as cold as imagined. The winter in Russia is indeed quite long, from around October to April of the following year, with the lowest temperature around minus 20 degrees Celsius and cold outdoors. But indoors, due to the excellent collective heating in Russia, whether it is teaching buildings, classrooms, libraries, canteens, or dormitories, they are all very warm. The indoor temperature is about 25-6 degrees Celsius, and windows need to be opened when it is hot.