A rather dull picture but makes a point. East Fife in Scotland can be very dry and suddenly we have a long hot spell. This is after 4 relatively cool summers. Up to 5 years ago I had found many Meconopsis do not tolerate this current dryness with the exception of M. punicea. The soil  is nice and damp already but one cannot create a humid atmosphere for any length of time even with a mist system and most Meconopsis cannot tolerate hot dry air. This is why I grow most of my most precious plants in cool 

Caithness in the far north east of Scotland.