Yellowstone is having a cold winter. Snow is everywhere - deep snow, with moose and elk up to their bellies in pure white powder. Floating Island Lake is frozen solid allowing bison to walk across without falling in. The thermometer dives below zero daily, reaching -40 at least once. We should have guessed it would be like this during that first week of October, a time the Park usually basks in Indian summer. Instead temperatures rarely rose above 45 and it rained and/or snowed each day until one drizzly day slid into the next snowy one. In the end it was one cold, wet week.