Hi Chris,
CG>AhHah! So when, this weekend, I plant my peas in my 15-litre ice-
CG>cream tubs, they have a good chance of doing well, as the soil is
CG>more likley to be at the air temperature than the ground
CG>temperature?
  If you're talking inground 60-70 feet above ground level on a balcony,
  the soil may be warmer, but winds are apt to cause intense evaporation
  and cool everything down. One way I cool melons on a hot sunny day w/o
  access to a fridge is to cover them with a light cloth, pour water
  over, and/or leave one end in a pan of water, in shade where there's a
  breeze. You have to have that breeze. :-) Same principle.
CG>FWIW I noticed that in yesterday's balmy 20C temperature, the
CG>floor of the underground parking was WET. I figure that the warm
CG>moist air hits the floor, which is still close to freezing, and
CG>the moisture condenses out.
  Yuppers. Not that it has to be close to freezing, but that the air has
  to be close to the dew point; when it reaches saturation, it starts
  condensing out on cooler surfaces.
                         ...Sandra...
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