In reply to jonny taylor:
> Fair enough, I've been reading about frost in valleys on MWIS, but sounds like you don't reckon it's enough yet.
I wouldn't have thought they would have been strong enough. Also when it's cold the glens do tend to be quite a bit colder at night than the tops.
> In terms of temporary effects, a temperature of 12 degrees at valley level in the middle of the day wouldn't be enough to put them off for the day then?
Definitely not.