Add the Degress!

The summer weather diagram on the left, perfectly illustrated by Lyneham Village Online graphic team, shows a Great Britain weather map with 30° in North West Scotland, 27° in South Yorkshire, 32° in Eire, 27° in East Anglia and 26° over Lyneham.

All we ask is "Add the Degrees" simply use your brainpower and tell us your answer. All the clues are on the diagram. It is for fun and the first correct answer will receive a nominated prize. Good luck!