Fair enough. 1 degree difference every single day would have a large effect on ice formation, which we actually have seen.
So then factoring that in, is a dramatic climate shift a reason to panic? IIRC, earth was a lot hotter during the time of dinosaurs, so there's no question that nature can deal with this change. Can humans deal with it? I don't see why not. Humans live in both the hottest and the coldest places on earth (where there is solid ground to walk on). Hottest place on earth ever recorded was Al 'Aziziyah in Libya, population of 4000+ humans. Coldest place on earth is Vostok; wiki says 13 humans live here during winter.
Humans also live in the most extreme conditions involving water. Lots of humans live in dry areas. Las Vegas is a city in the middle of the desert. The opposite of that is monsoon season where it rains seemingly nonstop for months at a time; humans live there too.
I'm not all that concerned. People generally adapt to their environment. How many people in Florida own a winter coat? Probably not many. How many people in Yukon have a winter coat? Everyone. That's how humans adapt. I bet most houses in Texas have air conditioners. Where I live, not many people have air conditioners other than the ones in our cars. I don't know anyone who has a tornado shelter, but these are probably the norm in Oklahoma. I live in a dry-ish area, so I don't own a rain coat. Whatever happens in the future, we can adapt to it. Maybe I'll buy a rain coat.