This is my second winter commuting so I decided to make a chart of what I wore that works at various temps. I used increments of 5 degrees Farahenheit. Now that spring is coming, I find the chart very useful in seeing what to wear when the temps dip low sometimes...I suspect the chart will be very useful for the next winter. I get a lot of anxiety fretting about what to wear sometimes... here's what I have, though it probably won't make much sense without seeing them. But you get the idea:

10F - Full mask, merino , cashmere, wool pants , double socks , double gloves, neck warmer
15F - Full mask, cashmere, wool pants , double socks , double gloves
20F - 3/4 mask, merino, wool pants , single socks , double gloves
25F - 1/2 mask, merino, wool pants , single socks , single gloves
30F - 1/2 mask, merino zipper half down, wool pants , single socks , single gloves
35F - 1/2 mask, merino zipper 3/4 down, , single socks , single gloves ( thin liner )
45F - 1/4 mask, merino zipper 3/4 down, , windbreaker pants no under thermals, single socks , liner gloves