Perhaps the BEA will release the weight and balance numbers for AF 459 on June 1. AF 459, an A-330-203, departed Sao Paolo for CDG, and after ORARO requested, as part of its deviation, a climb from 350 to 370 and was authorized such by ATLANTICO.
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With respect to the outside air temperature at 350, I believe Vasquez as does the BEA relies on the AMDAR measurements from EU 0046, thought to be the LH preceding AF 447 by about 20 minutes. The 744 is stated as being at 10660 meters, FL 325, and the outside air temperature was -40.6C. I believe Meteo France calculated the temperature at the top of the MCC that AF 447 encountered as -64C at 2h 07. I think the outside air temperature at 350 or 380 was likely lower than -40.6C.