Great call. If you have northern latitude maternal heritage and white skin, getting cold exposure in the winter (or anytime) helps your mitochondria make UVC light internally.
Discussion
Interesting. I prefer to live somewhere that has cold / snowy winters and substantially more sun (year round) that is near or below the 37th parallel. Right now I live in western Washington and it’s abysmal for sun exposure other than June-September. Just not enough.
Cloudy days are still great for red & IR spectrums 🙂 much healthier and brighter LUX levels than indoors