Why is the summer in Hangzhou so hot?

The reasons are as follows:

1. It is located in a subtropical monsoon climate area with high temperatures and rainy weather in summer.

2. Dense buildings are not conducive to air circulation.

3. High population density.

4. Car exhaust emits a lot, and car exhaust has a heat preservation effect.

5. The air humidity is high, and the temperature is less likely to dissipate compared to dry weather (the heat conduction of water is relatively slow).