Why the difference? Apparently the WaPo reporter can’t convert between Celsius and Fahrenheit correctly, due to an attempt to “Americanize” the story, she wanted to display the temperature in Fahrenheit, used in the United States.
If you don’t know the formula, you can use Google to do it, which is what she likely did. With Google 0.5°C converts to 32.9°F.
But that’s clearly wrong, because Blakemore is assuming that 0.5°C is an absolute temperature, rather than a difference in temperature due to the cooling effect between rural and city areas. If what she said were true, a pleasant city temperature of 65°F would be impossibly cooled down to 32.1°F (nearly freezing) by the effect of nearby rural areas. How embarrassing.
Despite this laughable failure of grade-school science, the WaPo story does point out the mechanism for how rural areas help keep cities cooler. The study, done in China says that heat is transported from the cities to the rural areas through a meteorological mechanism. The reason is a matter of physics, they write: