For 5 years, I shot 'Skate the Lake', a speed skating event in Portland (Ontario) held outdoors on a frozen lake at the end of January. Important to remember to let your camera adjust to the ambient temperature before you start shooting. Your batteries will be affected, carry extras in a fanny pack under your coat. I also used the adhesive ' foot warmers' and stuck 1 or 2 to the bottom of my battery pack and also around the camera grip 'cause your hands will get cold too. The hunting gloves that allow the finger covering to be folded back while still protecting the main part of your hand are also a good idea. You can also use hand and foot warmers in their regular application. Enjoy!