Local warming

When I went to school in Kyiv, Ukraine from 1992 to 2003, every single year we got -20, -25 two years out of three, -30 one year out of three. Mind that every single of those temps lasted for a week or so.

Last 5 years we've never had -10 for a single day. This is insane.

Summers are the same though, so it's ok.