Some days I feel like going fast(er) and hard(er) on the bike commute to the office, and some days I don't. Today was a 'don't' day, with an average speed of 16.8 km/h. Since it's a short commute (7.5 km), my dawdling didn't make it take much longer.
Perhaps it's the sunshine. Toronto has been grey on my commute days for more than a week, I think. (And next week it'll be back to grey on those days, based on the current forecast.)