I did some reading in the regs, and came up with this:
34) POST QUALIFYING PARC FERME
34.1 - if the FIA technical delegate is satisfied that changes in climatic conditions necessitate alterations to the specification of a car, changes may be made to the air ducts around the front and rear brakes and radiator ducts. These changes may be made at any time after the message “CHANGE IN CLIMATIC CONDITIONS” is shown on the timing monitors, from this point the choice of brake cooling and radiator ducts is free, subject always to compliance with the relevant Technical Regulations.
However the F1.com summary states this :
The only exception to this is when there is a "change in climatic conditions", for example a dry qualifying session followed by a wet race, or vice versa. In this case the FIA will give the teams permission to make further appropriate changes to their cars.
I guess my second question would be, when they say adjusting the ducts, I assume that would just mean the size of the ducts (to reflect the temperature changes)? Is that all they are allowed to change under this condition.