My gf is a doctor and rides year-round. In the winter I swap wheels with studded tires onto her bike (it takes a couple minutes). Where there's proper infrastructure, it's far safer to go out on a bike in poor conditions than it is an automobile. Plus you accumulate tremendous health benefits from not being sedentary. I'd work that into your pitch (of course, my gf is lucky to observe this first-hand at work every day, which an attorney might not).