Is there a big temperature difference between Shanghai and Henan?

Not big. There is little difference in winter temperatures between Shanghai and Henan, with an average minimum temperature of MINUS 5 degrees. But people's body feeling is obviously colder than that in Henan. Because Shanghai is located at the edge of the East China Sea, the humidity in the air is relatively high. The wetter the air, the greater the thermal conductivity. In winter, the greater the relative humidity of the air, the easier it is for the human body to dissipate heat, and the colder it will feel. Because humid air is more conducive to heat conduction, people will feel that wet cold is much colder than dry cold.