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Why does everything often have a reddish hue after it snows?

I have noticed that often when it snows, everything is red and it is much brighter outside at night. This doesn't happen every time and on some nights it's there, on others its not. Because it's not there every night it can't be street lights etc. being reflected off the snow. So what gives those snowy evenings a red glow?

Some of the redness you are talking about might result from prolonged exposure to the overall blue tint of the snow. In photos, you can clearly see how blue the snow looks the in shadows, where it is illuminated by the blue sky. Consequently, after looking at the blue snow, your eyes become blind to blue light, and that makes white light appear reddish.

As for redness at night, perhaps it is due to sodium vapor street lights. Other areas might not have a pink glow because the street lights are mercury vapor or perhaps halogen.

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