We just don't do sustained cold like we did years ago. I know, that just sounded like an old guy saying something like "I used to walk to school with snow up to my waist" kind of stuff, but really...as a kid, it was an expectation that we'd be able to play hockey on local ponds for weeks during the middle of winter. Ponds don't freeze that solid that long anymore because it just isn't cold enough, long enough.