an MEL that prohibits flight in known, forecast, or probable icing conditions.
Usually not a problem in Sunny Queensland
How about in tropical Singapore, or Malaysia?
"
known, forecast, or probable icing conditions" exist once the OAT drops below 10 C and visible moisture is present.
That occurs almost EVERY day in many aircrafts' operations, when flying through/in cloud.
To comply with the MEL, this condition (flying in known, forecast, or probable icing conditions) must to be avoided, which usually involves flying considerably lower than usual levels, or making large enroute deviations.
It may well be a warm 25 or 30 on the ground, but several thousand feet above it ain't!