Alastair wrote:

In case any one is as puzzled as me, I think that I have the answer.
A temperature of 10 C is the same as 50 F, but a temperature
difference of 10 C is only 18 F.

I wasn't puzzled before, but I am now.

Q: How did these reporters manage to pass the statutory GCSE in science?
A: A temperature of 10 C is the same as 50 F, but a temperature
difference of 10 C is only 18 F.

No, I can't make that fit at all.
--
Steve Loft
Sanday, Orkney. 5m ASL. http://sanday.org.uk/weather
Free weather station softwa http://sandaysoft.com/