A friend of mine and I have a collection of different quality and style drones. We fly all year long. Lately we both found that our Syma x5's and my X5 clone are very sluggish in the cold weather. Even if we keep the drones, the controllers, and the batteries warm right up until we fly. We can literally step out of a warm vehicle and put them in the air and they are REALLY sluggish. To the point that they do not even want to take off. We have to literally toss them into the air and then they are very slow and unresponsive. But even flying very slow and sluggish, the batteries seem to last longer than we expected them to. The batteries seem to last as long as they do in warmer weather. Could it be the motors are cold and don't function well? Or is it the cold somehow effects the accelerometers? My Syma X8's, my Aerosky X350, my Walkera X350 all seem normal. But the Syma X5's are sluggish or almost not flyable. My friends Hubson 501 also flies normal even in very cold temps. We have flown, in temps just above zero degrees F. But our Syma X5's and my hot-rod X5 clone does not hack it in the cold. Also, can it be the barometric pressure that may come in to play? My friend even went as far as replacing all the motors in his Syma X5, thinking it was that. Who can explain the physics of this?