I did once. December 10, 2013.
It was supposed to start snowing after 10 pm. The snow started at 4 pm. I was working until 7 pm.
Four inches of snow outside, and I had the bike with the summer slicks. Riding home with the bike in the back of my boss's pick-up, it ended a run of 1,596 consecutive workdays of bike commuting.
Full story here:
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