Answer: Hello mate!
There is something called heat urban island (UHI), this means that the city is better for accumulating and generating heat, this is primarily because there is a lot of pavement in the city, which accumulates more heat than the threes or grass that prevails in the rural town, and because the human activities, like the heat discarded by machines for example.
Then the phrase would be:
If you live in the city and head out to a rural town, the UHI suggests the rural area's temperature would be cooler.