Was curious which way you choose to go on the days the weather is drastically different from your morning commute to when you go home?

This morning I had a situation where the ground was wet with patchs of ice from a rain/snow storm from the night before. I probably should have switched to either the cyclocross bike or the mtn bike but.....I know that today, for the commute home, it's going to be in the mid 40's.