Fog?

I was woken in the early hours of the morning by ships fog horns - obviously visibility must have been limited out there. By the time I finally got up everything was pretty clear, but enough mist still hanging around to dull the full harshness of the sun.
It has been a beautiful day, though cold. Did a circuit of Mt Eden so getting a few kms under the belt, should really be doing a lot more. Lots of jobs done and dusted this week too, so looking forward to the weekend.