What's the difference in climate between Boston, USA and Xi, China?

Although Boston has a continental climate, it is obviously influenced by the maritime climate because it is close to the Atlantic Ocean. The average temperature is low and there is much snowfall. Xi is located in the transition zone between monsoon region and subtropical monsoon climate region, with high average temperature and less snowfall. Spring in Boston is very short, and it is not uncommon to snow in May. Xi has four distinct seasons, and it is hot in summer, often with high temperature above 36 degrees. Boston is cooler in summer, with an average temperature of around 28, so there is no need to turn on the air conditioner.