I miss read the OP's post, as I thought he was already a PPL. As a student, your instructor should be helping you with the weather decisions.
With respect to the ground wind I forgot to add 20 kts max with a max cross wind component of 10 kts. 20 kts is windy but not that windy. I would suggest if a licensed PPL is not comfortable with 20 kts down the runway then they should do a bit more training.