Keep the
batteries warm as possible.
I have a flannel bag that holds a few
batteries that I wear inside my coat.
Get a pair of gloves that have the touch sensitive finger tips so that you can use the Go4 app while flying.
I have a pair of lightweight knit gloves that work well.
The flight time may be a little reduced and you shouldn't fly while it is snowing as it may affect the sensors and cause problems, like flying in fog, mist or rain.
I'll say it again, keep the
batteries warm. Don't let them freeze if left in the car as this may permanently damage the
battery.
DJI shows the Spark operation temperature 32*F - 104*F (0-40C), but pilots have had successful flights below that and may have experienced a gimbal problem when moving it due to the cold.
And if there's a lot of snow on the ground, the surroundings may be brighter on a sunny day so a 4 sided sun hood of sorts is nice to have so you can see the device easily.