They've built an Ice Castle at the Mall of America. It's made entirely of fused icicles. But they've had weird weather for it this week. Earlier it was too warm, then it became too cold. When I visited the temperature had plunged into the single digits and fell further to 0 (or around -18 C for everyone else). With the windchill it was in negatives, I saw "feels like -20" (-29 C). Miserable, but a beautiful work of ice architecture.