After serious thinking Colin Wilson wrote :
Do LCDs tend to suffer if the ambient temperature is low ?

Yes!

- the
controller is in an ante-room, which is basically a small square with
a tumble dryer and a single glazed back door with a huge sodding dog
flap to let the mutt out, so if ambient temp can be a problem for it,
it might not be a "real" issue to worry about :-}

They also suffer from moisture, but when they warm up/dry out they are
usually fine.

--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk