I hate to be a buzzkill, but you better enjoy the mild temperatures while you can, because the dreaded Polar Vortex is lurking right around the corner.

According to the National Weather Service facebook page:

The warm-up at the end of the week is going to be a short one. Most of the long range guidance (NAEFS ensemble image depicted here) as well as the CPC outlooks have colder than normal weather returning next week.

And from theatlanticcities.com, quoting Weather Underground's Jeff Masters:

The peak cold is predicted to occur late next week, with temperatures 20 - 35° below normal covering much of the eastern 2/3 of the country.