What does "Led by your scent to fairer climes at last" mean?
Fairer climes is somewhere the weather or at least climate (i.e. climes) is better. Following someone's scent there has a number of meanings, in this case I'm guessing prose of 50+ years ago then it's probably an affectionate reference to a perfume. However, In modern day parlance it might indicate a 'soap dodger' — how times have changed. The final 'at last' implies a long term relationship, therefore I see a couple re-uniting after a significant time apart.
In England a common cause of such a separation would be working in the 'colonies' (please don't flame). I'd say this was written by a man who was returning to fairer climes, i.e. away from Africa/India where fever, heat etc. was quite likely to kill, following his loved one.