The coldest winter, and coldest year, both happened in the US in 2014, but almost nobody knows this

 Which is just strange

Here's some of the data

Understanding science

 

The cooling trend that started in the 50s or 60s

 It shows up in most of the GHCN stations, with variations in timing. 

It also shows up using snowfall data.  Of course.

I've looked at every state, the following are representative, and the astute observer will note the variations