Because of snow’s insulating properties igloos can be as much as fifty degrees warmer inside, making it vastly more comfortable and livable than a tent for winter camping. Below is a long out of print tutorial on igloo building (the best I have ever seen) that will take you step by step through the process. Click to enlarge and view full size
“May you have warmth in your igloo, oil in your lamp, and peace in your heart” –Inuit Proverb