my husband rode his bike everyday for more than 3 years. He took a couple days off when he got sick. Where I live (Seattle) you really can ride every day if you don't mind being cold and/or wet. He thrived in the worst of weather. He'd call me on the way home from work to see if i needed something from the store, and he'd be happily describing the puddles, the wind, or the snow. He really scared me one year so we decided he needed a snow bike. Then he really could ride in any weather.
Me, on the other hand; I have discovered that I can usually manage to find 1 day per week with weather suitable for MY riding preferences all year round. It really pays to keep riding all winter because getting back to it is so painful.