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Difference in temperature cannot be expressed in °C. It’s not 5 °C warmer today than yesterday. It’s 5 K warmer. You can say “five degrees warmer”, but not “five degrees Celsius warmer” or “five Celsius warmer”. “Five Celsius degrees warmer” is also correct, but who’d do that?
The reason is that the Celsius scale has a fixed offset. If your birthday is in a week, you wouldn’t say it’s “one seventh of January from today”.
I think this one wins the post guys.