There is no strict line to define “冷，热，很冷，很热，暖和，凉快”，It means if the temperature is 20 degrees celsius, we can’t define it as “热”，because people in Africa maybe feel a little bit chilly at this temperature. So people living in their own city might have their own definition of “冷” and “热”，”暖和” and “凉快” are even harder to distinguish. Let’s use 15 degrees celsius as an example. If this temperature happens between winter and spring, then it’s better to use “暖和”，because it’s an upper trend. The same temperature happens between summer and fall. It’s better to use “凉快”to describe it. Cause it’s a down-trend.
