If you already have been around a lot of monkeys then yeah it's not worth it.
The monkeys are there year round now because the park rangers throw out food everyday. It used to be only in the winter they would be there because of the hot springs. The best times are winter to get the picture with snow on their heads while they are relaxing in a steaming hot spring, mid-late Spring for babies and late Summer to get pictures of the toddlers playing with each other. I've already been there in the summer for the toddlers and I'm hoping either this year or next year to get the snow pictures.
Originally Posted by
angra
The monkeys will be there, but the snow might not
Originally Posted by
kapooncha
Haha I had monkeys jumping all over me at the Monkey Temple in India, with some great selfies. So without the snow, it's not as exciting for me.