Not Necessarily Rhetorical

Does human blood really become thinner in warmer climates?
Southern California has experienced a stretch of cold weather. The temperature some nights has dropped into the low thirties. During some days it has not topped fifty-five. People here have been in shock. They stare at windshields and wonder what to do about the ice covering them.
They wear gloves and watch caps. They run to ski shops to purchase parkas. Such behavior is understandable if a person has never lived outside Los Angeles County. Those people have no knowledge or experience with winter.
However, I know a guy who moved here several years ago because he hated the weather in his home town.
"Brooklyn," he said, "was too cold."
Then he clapped his gloved hands together to reclaim blood flow into his fingers.
I stared at him in disbelief. The temperature was almost sixty degrees. He saw my expression and explained that since moving to Southern California his blood had become thin.
I think people here just like to wear nifty winter clothing and seize any opportunity to do so.
That's my story and I'm sticking to it.
No. I mean it. It's so cold here in Southern California my fingers are stuck to my keyboard.
Really.