Cold therapy DOES give you a high and a sense of well being that lasts for hours, if not days. Yes, it's a seasonal thing. Love the big trees and the few people - and hoping you enjoy the converse over the summer months - lots of D3 and warm watery caresses. It will make next winter's cold plunges feel more valued.
Absolutely! I've been a massive fan of swimming in cold water for a while now, my health has never been better and yes, there is a truth to your statement, people report feeling good days after a cold swim. Alas, the summer is pressing and cold waters have receded, but we'll keep in form with cold showers until the next winter!