Minnesota Teen Braves Freezing Temps in Backyard Snow Cave

Rudy Hummel is seven months into his goal of sleeping outdoors for a year.
3:00 | 01/07/14

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Transcript for Minnesota Teen Braves Freezing Temps in Backyard Snow Cave
It was about twenty degrees below zero overnight in -- town Minnesota. And still seventeen year old Rudy -- Slept outside. It's -- adventure that began seven months ago I thought it would be fun to sleep outside all summer. And halfway through the summer that just. Blossomed into this. Rudy is hoping to make it outside at night for what in full year now at this point he has quite the igloo along with. Six layers of clothing several sleeping bags some wool blankets. And as -- not too worried. We checked on and once that was last night because it was so cold. And that's the first time we've checked -- -- and I don't ever feel like I -- calling me and I really don't I want him to succeed. Rudy does spend the days inside. -- that he's working on a way to turn this into a way to raise money for charity.

This transcript has been automatically generated and may not be 100% accurate.

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