I have been commuting by bike since Feb 2011 and it was 15 f degrees on my first day. The cold did not stop me that day nor has it stopped me since. I don't go below 10 f degrees. The ice and snow on the road stop me due to the hill at the end of my commute where I take a left turn and fear for my life. Also I find life has been getting in my way of cycle commuting this year. While my husband was having radiation I could not bike commute as I did not have enough time to fit his health care and my work. Now I am working 9 hour days so I can work half a day Friday's making me more tired. I try and commute as much as possible as I love riding my bike.