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Cities own microclimate
Some large metropolises have microclimates – that is, their own small climates that differ from the local environment.
Often these are due to the massive amounts of concrete, asphalt and steel; these materials retain and reflect heat and do not absorb water, which keeps a city warmer at night.
This phenomenon specifically is often known as an urban heat island. The extreme energy usage in large cities may also contribute to this.
