Even Polaroid photo itself needs to be warmed up during winter!
If not, you will get blank photos! (see above).
The secret to this is to quickly slipped them under your thick jacket against your skin! (after you taken the shot!) Yes people, put your SKIN in the game!
Warm it up for about 2 minutes, then you can start to see it developing in-front of your eyes.
The longer you warm your shot, darker it will look, so manage them accordingly.
After you done that, I can assured you to be producing stunning Black and White shots.
this one was a bit underexposed, but was warmed for 3 minutes.