Snow Photos-How to shoot so the snow is white!
First, I frame my shot and focus. Then I zoom into a bright area of snow in the scene. Using my exposure compensation button, I dial in a value between +2/3 to +1 2/3 Exposure Value, depending on the brightness of the snow. Then I take a meter reading, remembering the settings, I switch to manual, and dial in the new shutter speed and aperture. This overexposure will ensure that the snow looks white, but it won't blow out other objects in the image.
Try it and see if you helps you find fluffy white snow, rather than gray blah snowy images:)
Photo credits: Nancy Ziller.