The issue with temperature has to do with large swings in temps. If you take your craft from a warm environment into a cold environment (or opposite way) you can have control issue. You can usually tell you will have a problem when lifting off as it will not be very stable. I have found that I need to let the craft sit outside 15 minutes in a swing of 30 degrees F.
I also agree with Ken that battery capacity can be an issue if you don't keep the batteries warm. I keep them on the floor of my car by the heater output and leave them there until I use them. Once you start drawing power they heat up fine.
Lou