Science teachers regularly teach the method to convert from Celsius temperatures to Fahrenheit and conversely. The 100 °C span between the freezing point of water (0 °C, 32 °F) and its boiling point (100 °C, 212 °F) at one atmosphere corresponds to a 180 °F span between the two reference points. The Celsius degrees are 9/5 as large as the Fahrenheit degrees.
This education, however, does not seem to extend to writers at Reuters, who mistake a rise in temperature with temperature. I quote:
It would have been scarier if they discovered that a rise of 0 °C is actually 32 °F.