I think that is a State Law... temps below -10 require snuggling by a fire.
We have been in the 40s - 50s. At night, it dips down to the 30s but we have only had one night below freezing. It got down to 30F and then back up to 54 by afternoon.
Wild temperature swings are not unusual here.
Spearfish, South Dakota holds two Guinness World Records for the fastest temperature change in history:
Fastest temperature rise
On January 22, 1943, the temperature in Spearfish rose from −4°F to +45°F in two minutes. This was caused by a Chinook wind that rapidly picked up speed. The temperature change was so extreme that it cracked glass windows and frosted car windows.
Fastest temperature drop
A short time after the temperature rise, the Chinook wind died down and the temperature dropped back to −4°F in 27 minutes.
The extreme temperature change was so unusual that it made national news and was even featured in Ripley's Believe it or Not. The fluctuating temperatures also damaged many pine trees in the area.
Moral of the Story:
If you think snuggle time is over, hang on. It might not be.