This page is not intended for the die hard, sub zero,  winter photographer but for the more casual photographer who often finds oneself in 10 to 20 degree F weather for a few hours of the day, especially in the early morning.  Other published material is available on this subject but below are a few ideas and a reiteration of some old ones based on personal experience.

Lithium Batteries

In 20 degree F weather, alkaline batteries may only last 1 or 2 rolls of film especially with the more high tech cameras equipped with auto focus and image stabilization.  Lithium batteries will last for 40 rolls or more under the same conditions.  They cost twice as much as alkaline batteries but last many times longer in certain cold conditions. Other photographers appear to be using nickel metal hydride batteries with good success and much less operating cost.   

Heat Packs

Even with some of the best clothing available, sometimes your hands or feet just get cold.  I've found that little 75 cent heat packs can be worth their weight in gold.  You only need one or two and they will generate 130 degrees F of heat for at least 6 hours.  

Knee Pads

If you're going to be in one spot for a period of time, need to shoot a macro photograph, or just need a low perspective,  a knee pad (volleyball etc)  on at least one knee can be really comfortable and keep your mind on taking pictures instead of the pain in your knees. 

Micro Fiver Cloth

I can't believe how many times I've breathed on the viewfinder while raising the camera to my face.  You get instant fog on the viewfinder glass and won't be able to see anything for several minutes.  A micro fiber cloth will help.