I was inspired by the movie Chasing Ice to pursue a passion for outdoor time lapses. In this instance, I needed something safe, long term (~1 yr), and able to take very cold conditions. While I love the Canon CHDK setup, there are few outdoor options for consumer purposes.
The GoPro can be used with the well-designed Cam-Do outdoor mount, scheduler, and Voltaic batteries for an outdoor timelapse of long duration in near 0o F weather. It is unknown how long the battery life is for a standard lithium GoPro battery in the below-freezing temperatures. A silica packet can be included if humidity is an issue, and a packing of towels or insulation should be placed around the camera, scheduler and battery.