I have been winter smoking, and I mean winter smoking at -25C sometimes for over three years now, and have never had a cigar crack on me. I think one of the posters was right when he mentions uneven humidity in the cigar. All of my cigars are well rested for my humidity levels, and maybe that is what makes the difference.

Good luck in finding a solution brother.
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How Can You Have Uneven RH Levels When Your Cigars Have Rested Together In The Same Humi For At Least 3-6 Months? Digital Hygrometers Are Calibrated Every Month & RH Doesn't Vary over 1-2 Points Over A 6 Month Period. I Still Think The Huge RH Swing In The Mobile Winters Is The Problem. When You Go From 65RH In The Humi To 17 RH Outside, Something Has To Give, And It's Probably The Wrapper. Now That The RH Is Up To The Usual 75-80 In Our Wet Winters, I've Had No Problems With My Sticks.

Thanks For All The Tips, Inmates!:-)
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I smoke in my garage with the door about half up. I invested in a portable propane heater and a fan pointing out of my garage to keep the smoke out. Seems to work pretty well.
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I was having a cigar with a buddy of mine this weekend and his cigar split. It was fairly chilly (about 18 degrees), but the weird thing was that we both just bought them and mine didn't split.
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