Cumulus Support

Had a look at wiki webtags and couldnt see one. Is there a webtag to show the total hours of sunshine for year / month ?

No, because Cumulus doesn't currently maintain those totals, only yesterday's and today's total. You can get the figures from the 'this month' and 'this year' displays, but they are calculated 'on demand' and hence can't sensibly be put into a web tag.