Most people at work know that I commute on my bike and on a day when it rains I can practically count on someone asking me, "Did you ride today? It's really wet out there."
When I respond in the affirmative it is not uncommon for them to fire back with something like, "Wow, I don't know how you do it." Come on people, it's water. Most people either start or finish their day by choosing to have a cascade of water stream over them for several minutes.
Truth be known, I prefer riding in the rain. It is much more pleasant. Why would I say this? Well take a look at the pathway I ride on during a day when it rains.
When it rains I basically have the place to myself. This next picture is actually fairly tame in terms of path traffic on a non-rainy day. It is not unusual for the pathway to be entirely taken up with people and riders whose behavior can best be described as erratic. I am actually surprised I do not see more accidents than I do.
My advice if you want to commute no matter the weather? Invest in some quality rain gear and I think you will find it to be an extraordinarily enjoyable experience.