Just below 40F for the ride in. I wore shorts and got some cold knees.

I hop on a sidewalk to stay off a busy road for about 1/10th of a mile. It goes from a neighborhood entrance to a shopping center entrance. At the neighborhood entrance there are two metal doors that open to some sort of gas or utility pipes under the sidewalk. They've always been closed and are fine for biking across - not grates, just solid steel. This morning one of them was open but nobody was around. I'm glad I saw it because the hole is big enough for most of my bike and me to fall into. Probably a 3.5 x 2 foot opening and maybe 4 feet deep. I stopped to close it. It was heavy enough that I had to get a good position for leverage to do so.