Why is it so cold this year?

Climate change, natural climate cycle, regional weather system and other reasons.

1. Climate change: Global climate change is a complex problem, which affects the temperature in some areas. Will experience an unusually cold winter, which is the increase of extreme weather events or the change of climate patterns caused by climate change.

2. Natural climate cycle: Natural climate cycle will also have an impact on the annual temperature. El Nino phenomenon is a periodic change of the interaction between the ocean and the atmosphere in the Pacific region, which leads to abnormally low temperature in some areas.

3. Regional weather system: The continuous inflow of cold front, high pressure system or cold air will cause the temperature to drop and make it feel colder in winter.