What's the climate like in Glasgow, England (approximate temperature all year round)? I heard that the indoor temperature there will be higher in winter. What is the reason?

The climate is humid, with four seasons like spring, frequent rains and cloudy days. It can be below zero in the coldest time in winter, and not more than 25 degrees in the hottest time in summer (usually in May and June). Because indoor heating is generally used, you can wear short sleeves directly in public facilities such as schools (just wear down jackets when you go out).