I have been using "Fair Weather" for when testing aircraft in an ISA atmosphere, but that probably not fully correct, at least the temperature is 5 degrees off.
Does anyone have compiled some METARs that simulate ISA atmospheres for convenient flight testing?
The ones I am looking for is:
ISA
ISA +10
ISA -15
ISA -30
I can probably do some myself, but no reason to reinvent the wheel if someone else already has done it.