Weather.com says it is nineteen degrees out there. I see no reason to doubt them.
I'll be shooting minor caliber at pins today, with the ParaUSA LTC 9. The only thing I'm worried about is the way the pins behave in the super duper cold. Last month, it was pretty chilly for the first few rounds in the morning, and the cold pins were spalling off huge chunks of plastic and wood. If you center punched one, like I did with a 230gr Golden Saber on my first shot of the day, the pin virtually exploded on its way off the table. On the other hand, a peripheral hit just threw white plastic fragments and left an oddly asymmetrical pin on its side to be laboriously shot off the table.