COOLEST STRATOSPHERIC TEMPERATURE
Oh dear! The temperatures for the stratosphere for February 2006 and the period December 2005 to February 2006 were both the coolest on record, as you can see on NOAA/NCDC's site.
The hotter the troposphere gets (the lower atmosphere, the bit we live in), the cooler the stratosphere gets. And the cooler the stratosphere gets, the closer we get to that terrible tipping-point, the one at which the ice-clouds form that accelerate the destruction of ozone (the temperature we don't want to reach is -78 Celsius).