My settings for live weather ( General Options>Data) have always had it enabled and it has always opened with live weather. In the last week, although the live weather option in the settings remains in the 'on' position - when I open the simulator at a gate or the runway - I get 'artic chill' weather. When I go to the weather icon on the top menu bar - both live weather and real time are turned off. Not sure what has caused this or how to remedy it. Just started in the last week and to my knowledge I have not made any changes to the sim settings.

Any thoughts?

Take a look at the weather setting you can access from the world map.

Thanks MrFuzzy - that solved the issue - although to my knowledge I had not changed anything - but heh job done.