The single most useful thing to understand about winter in China is that it is decided by a line on a map drawn in the 1950s, not by how cold a place actually gets.
The line#
The Qinling–Huai River line (秦岭淮河线, Qínlǐng Huáihé xiàn) runs roughly along the 33rd parallel, following the Qinling mountains and the Huai river. It is China's traditional north–south divide — wheat above, rice below — and when centrally planned district heating was built out with Soviet assistance, that line became the boundary for it.
Cities north of it got municipal heating networks. Cities a short distance south of it did not, and still do not. The criterion applied was roughly that a region needed 90 or more days a year with daily average temperatures at or below 5°C.
North of the line — Beijing, Xi'an, Harbin, Datong, Urumqi, Yinchuan — buildings are heated centrally from around 15 November to mid-March, with the exact dates set locally and starting earlier the further north you go. Interiors are genuinely warm, often too warm, and hotels are comfortable.
South of the line — Shanghai, Hangzhou, Suzhou, Wuhan, Chengdu, Chongqing, Guilin, Kunming — there is no municipal heating at all. Buildings were designed without it, walls are thin, and there is often no double glazing.
Why southern winters feel worse#
Shanghai in January sits a few degrees above freezing with high humidity, which is not severe by northern European standards. The difference is that in London or Berlin you go indoors and warm up. In Shanghai the flat, the restaurant, the museum and the shop are all the same temperature as the street, and you never get warm at all. Damp cold at 4°C indoors, all day, is more punishing than dry cold at −10°C with a radiator to come back to.
Chengdu and Chongqing add near-permanent winter cloud to it. This is the reason experienced travellers dress in layers for a southern Chinese winter and treat a northern one as a coat problem.
What hotels actually do about it#
Southern hotels heat rooms with the air conditioner in reverse-cycle mode. This works, with caveats worth knowing:
- Check the remote is set to heat, not cool — the icon is usually a sun. If the display shows a snowflake you are air-conditioning yourself in January.
- Reverse-cycle units dry the air and lose efficiency as it gets colder outside. Expect a room that is warm near the unit and cool at the far wall.
- Many units switch off when the room card is pulled, so the room is cold again when you return. Some travellers leave a spare card in the slot.
- Cheaper southern hotels and guesthouses may have no heating at all. Ask before booking in December or January, and read reviews for the word "cold" rather than trusting the amenities list.
Electric blankets are near-universal in southern guesthouses and are more effective than the air conditioner at the thing you most want, which is a warm bed.
What to pack for a southern winter#
Thermal base layers, which most visitors do not think to bring for a city with a mild forecast, plus indoor-appropriate warm layers rather than one heavy coat you take off inside. For the north, a proper winter coat, hat and gloves — and expect to be uncomfortably hot in every building you enter.
When to visit which part of China sets out the seasons region by region, and the accommodation guide covers what to check before booking, including the registration rules that decide which hotels can take you at all.