You would enjoy it, summer or winter. Winter makes for a memorable experience. Akin to when I took my wife to Lightning Ridge at the end of January once. She opened the car door to a 50C blast from the outback oven, looked at the peeling white of the shiplap settler's house I had rented, and said "You brought me from those beautiful luxury hotels in Sydney, to this?", to which my reply was "This is the real Australia and you'll find this is the best part of the trip, and by the way, it has no air-con and the lady who owns it rang me to say the electricity is out." One has to live dangerously sometimes to appreciate life. Thankfully, it was indeed the best part of the trip for her and she longs to go back. A lovely old lady, who owned the house lived next door, was delighted when I fixed the electricity the next morning, fortunately in town they had new circuit breakers and things. Wet towels on your back, who needs air-con, right? You'll find Scotland the same way for stalking, though at a different end of the temperature range.
Whether coming in winter or summer, worth popping into a highland outfitter first for everything from wellies to tweed or go for the bargain waterproof camo stuff at Decathlon. Add midge repellant to that in the summer.
Your series on the NZ beasts is good. Thanks, just looked at it now when searching for that visitor thread you mentioned.