I live in Seattle. It's 12C in my apartment right now, I have the windows open and I'm certainly not wearing any gloves. Hell, I'm not even wearing any socks. I'm wearing long pants and a thickish shirt with long sleeves, and I feel totally toasty.
West coast of North America is less humid than many other places, and hence 12C in Seattle is not 12C in the Midwest or East coast. Less humidity means less heat transfer, and so 12C in Seattle can feel like 17C in NYC. And 12C in NYC can feel like 6C in Seattle.