Ha, I agree with the comments of "What?!?" about the 54°, LOL.
My first cold ride was 46°. That was cold, I had no idea how to dress nor do I have wind stopping clothing. I wore a sweatshirt and sweatpants and when it reached above 50, I couldn't wait to get back and take them off (was wearing shorts and t-shirt underneath, but didn't have a way of carrying.)
The next weekend it was 52°. That was perfectly comfortable in my shorts and t-shirt.
Then again, if it wasn't for the snow blowing back on me, I would probably wear shorts and a sweatshirt out snowblowing the typical 12 inches of snow out of my driveway when it was 20° or colder.