Whats too cold for ducklings

[tnorthrup]

I have 4, 2 weeks old ducklings. We've been spending a little time outside everyday and I have been slowly introducing them to my older ducks. Today its going to be about 65 out. Is that too cold for them to be outside? They are starting to get feathers but not a lot

 

[NuggetTheChicken]

A bit too cold for them. I would say if they were 4 weeks old, then they could've gone out