The most sensive component is the Li-Ion battery.
If you're worried about the temperature you'd install a battery monitor like Battery Monitor Widget for to measure the temperature of the battery (by time on a graph).
The Li-Ion battery's temperature operating range is:
for discharging -20C (-4F) to +60C (+140F).
for charging 0C (+32F) to +45C (+113F).
Google Translate is to blame for my grammar