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After a few years of year-round exercise now, I'm pretty well convinced I was born to exercise in overcast skies in the 50s. Coincidentally, I grew up in Seattle and have only lived in Washington. ;)
My husband spent a few years in WA, then moved to CO, then spent 10 years in TN before moving back to WA in college, where he's lived since. He can't tolerate the cooler temps nearly as well. There are probably other factors, but I wonder if it's just the environment you spent/spend the most time in outside collectively - we all (generally) spend a lot of time outside as kids, and maybe that's where we do the majority of our general acclimatizing.
It takes me a few weeks to acclimate to warm summer weather, and I still haven't quite figured out the formula for high effort or endurance exercise in hotter temps with lots of sun.
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i have spent time in snow (not super cold maybe 10 degrees Fahrenheit but still i did better than my aunt who lived at the south pole for a while) and time in tropics and i always seem to adapt quickly and do better than others regardless of climate. i was born in San Francisco in march so was probably pretty mild weather.