As a kid, I thought there was a "real" first day of every season which was only visible to those who were open and perceptive enough to see it. The appearance of hundreds of baby spiders would herald a transition between seasons, among several other magical events, such as mushroom circles sprung up overnight or the first crystalline frost. I would spot them on my walk to school, newly hatched from so many eggs and sent out on the breeze, strewn between the branches of trees, webs glinting in sunlight.
Fingertips of trees
Covered with orbs of dew.
Cobwebs turned into
jewel bedecked and
A sideline in metereology would be handy at this point, because the ability to reliably predict the manifestation of fog would be optimal. Fog forms when the difference between the temperature and the dew point is generally less than 2.5C. Dew point it turns out is the temperature to which a given parcel of humid air must be cooled, at constant barometric pressure, for water vapor to condense into water. The condensed water is called dew.
This was gleaned from wikipedia, but given fog is not renowned for having an inimical affect on the tempremant of farmers or such it is not heavily featured at the Bureau of Metereology's website. The latest weather observations for Canberra are now my friend.
PS Just be clicking on the images for a better view.