At around 45F this morning, this was the first day that I rode wearing a backpack without sweating - until I walked my bike into the climate-controlled bike parking room at work.

Descent from my house down the hill was chilly, but I have a couple of climbs after that to warm up quickly. I wore:

Long-sleeve base layer shirt
Polyester t-shirt
Light cycling jacket
Backpack
Weatherproof tights
Socks
Skateboard shoes
Polyester cycling cap under helmet
Light cycling gloves

Tried that route through DCA airport roads again. Got stuck at the intersection of Abindgon and Aviation Circle. There's no sensor for a bicycle there - the cars on Abindgon on the other side of the intersection got the green light twice and my light stayed red all the time. There's always cars on Aviation Circle in both directions, so it wasn't a simple matter of waiting for the road to be clear on both sides. I finally got through by taking a guess when it would be safe to ride through the intersection - had to be when the cars on Abindgon were crossing it in the opposite direction, without turning left. That is one guessing game I don't care to play again.

Back to the mulch path for me.