Based on my experience with my Garmin and knowing where you live, if I were getting a wireless computer I'd be darn sure the sending unit is waterproof. Garmin is good about replacing their cadence/wheel sensors under warranty whenever I get rained on unexpectedly (or forget to take it off before washing my bike), but it's a PITA and it really would be an unacceptable design flaw if there were any other computers that do what theirs do.