In summer, the temperature exceeds 30 degrees. What is the general water temperature?

First of all, it depends on the water used in the city.

Secondly, it depends on how long the water stays in the pipeline.

The third depends on the local temperature.

The water supply in' is groundwater, so the water temperature is low, generally 14- 15 degrees.

In some cities, the water supply is all surface water, so the water temperature is high, generally 18-20 degrees.

The water temperature of tap water is lower than that of air. There is no certain proportion of how low it is. If the temperature drops these days, the water temperature is relatively warm. If it is warming up, the water temperature is relatively low. There is a lagging process.