Question
some of the end of the leaves on my dewthreads are dead looking, is this normal? it has been raining a lot also, the dewthreds don't have very much dew either, is this because of the rain?

Answer
If it's occurring on the outer, older leaves, then yes, this is perfectly normal.  The leaves last for about a month or so.  The plant will produce more leaves throughout the growing season.  Look in the center of the plant for new growth.

Yes, rain will also wash off the dew.  This is too is normal and happens in nature too.  

Good growing!
Jacob Farin