I commuted one day in February, because it was unseasonably warm, and so that I could say "I did it."
Did the same in March.
Twice this week, and one day was colder than many of the days that I passed on earlier this year. It's more of a motivational issue, shaking off those winter blues that affect me more these past few years.
Exactly the reason I started bike commuting. This year, I am starting earlier than last, and last year I started earlier than the year before.
Trying a few new things; got a hitch-mount bike rack, rather than throwing the bike into the trunk (multi-modal commute, you know), experimenting with wax rather than oil (too many pant stains), helmet-mounted rear light.
Looking for that magical set of clothing, gear, and bike that will overcome all that internal resistance. (Ha!)