This looks like a quite spring-like week with the near/record cold air trying to move southward, but it will tend to get locked up in the far northern U.S. &
So lets give some Perspective to this.
It has been one of the coldest Mays on record in parts of Texas! The nation against the 30 year means ending 2010 is .5F BELOW average for May (against the new 30 year means ending in 2020 its likely about .7F below average). This is the coolest May GLOBALLY since 2014, which was before the Super Nino that helped warm the globe after 2015-2016. In fact, that last 3 Mays have been cooler than average across the US. Its late May it SHOULD get hot in places by now. But here is May so far:
Europe also. One of the coolest Mays on record and its been a very cool SPRING there.