Bike commuting definitely makes you much more aware of the weather and subject to its whims. Although I am certainly not as hard core as many of the commuters here, I do commute year-round and have ridden in my share of extremes. Here is my list:

- Hottest: about 105 F air temp, and probably 5-10 degrees hotter on pavement. It is also very humid in NC during summer, so that's not a dry heat.
- Coldest: about 15 F. It doesn't get much colder than that most winters in NC.
- Windiest: about 30-35 mph (gusts) on a number of occasions.
- Rainiest: about 1" during my commute, but I am a wimp and usually drive when it's rainy.
- Snowiest: flurries. We rarely ever get snow, and I wouldn't ride in it on purpose.
- Smoggiest: I have ridden on Code Red days for ozone and particle pollution but wouldn't recommend it. The worst was when we had heavy smoke from a large forest fire, and it was foolish of me to ride that day.
- Other: We had record high pollen levels this spring, and it made me miserable. I rode on 2 days when the pollen count exceeded 3,000, and that was probably not a smart choice as my allergies bothered me for weeks afterwards.