Bhutan trip in March(21st - 28th)

Hey guys, I am planning the trip for 7D/8N- phuentsholing>>thimpu>>punakha>>paro>>phuentsholing during 21st March to 28th March.

I want to know how should I pack for the trip since I am sure how the weather would be at that time.

Secondly fellow traveller's please share any tips or things which shouldn't be missed during packing