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I started a ride around sunset tonight. I think there was an odd north south temperature gradient in the city today. I noticed weather station just north of me was 3C warmer. At the start of the ride it was -10C, and hour in when I got to the park I was going ride around in it had dropped to -17C. The front of my legs were going numb, so I cancelled that plan and started riding back home. While going back north the temperature went back up to -13C and my legs warmed up. When checked the other weather station its still 3C warmer. It's fairly odd for my legs to get cold when everything else is warm.