I do wear shorts in the 40's. It's nice! I've been in California for three years now, and I swear I'll never get used to this weather. I miss snow. People complaining when the temperature 'drops' to 50F is pathetic, if you ask me.

But I certainly have seen an increase in commuters. It's encouraging, but disheartening that so many cyclists (and car drivers for that matter) have no idea how to handle a vehicle on the street.