I find that when the weather is poor, my extremities are what feel it most. I like warm gloves and booties on a day like you are describing.

That said, while rain and mid 50's probably sounds cold to someone living in Arizona, it really isn't all that cold. I suspect you will find you are warmer than you expect to be AS LONG AS YOU KEEP MOVING. It's the stopping (and subsequent re-starting) that will probably chill you most. In wet weather, I find it best to take much shorter breaks, and to keep my body temperature up.

Also, most people eat and drink less when it's wet, because they don't feel as thirsty and because managing food with gloves is a bit more challenging. Try to avoid letting this happen to you. Make sure to eat and drink on the same schedule. If you get behind, it will affect your body temperature for the worse. If you start to feel cold, try to eat something. It will help.

Hope this helps!

Susan