When you commute, you think a lot about timing. You know that leaving a few minutes earlier or later might put you into, or keep you out of traffic, on some stretch of your ride. You may also notice a temperature difference. In my case, I had completely different weather than I'd've had had I left fifteen minutes earlier than I did.
When I'd originally planned to leave, rain was falling and the temperature was about to fall below 45F, where it had been (give or take a degree or two) through the morning and the previous night. And the air was still calm.
However, I misplaced a couple of papers and searching for them put me about fifteen minutes behind schedule. By then, the rain had stopped and temperatures below freezing were forecast for my commute home. I can live with such conditions, so I decided to chance the weather.
I hadn't counted on one other condition mentioned in the forecast: the wind. I must have had a steady 15MPH (25KPH) stream at my back for the stretch from Woodside all the way to my job. Gusts of at least double that speed turned my back into a sail by the World's Fair Marina. So, in spite of leaving late, I arrived at work early.
I'm still there now, dreading/anticipating riding into the wind that blew me here.