Arctic air is in place over North Central Montana Monday, and it's going to stay there Tuesday as well.
Nearly the whole area is seeing daytime highs that are below zero, and overnight lows will fall as cold as the teens below zero, with some spots close to -20.
Wind chill temperatures by Tuesday morning will range from -20 to -50.
In those areas, frostbite will be possible in as little as 5 to 10 minutes.
Fortunately Helena won't be quite as cold..
Lows Monday night will be near zero, with wind chills in the single digits below zero.
High temperatures Tuesday will be around 10 degrees, with scattered flurries and light and variable winds.
Looking ahead, models are split as to when the arctic air leaves our state.
Some models keep bitter cold around as late as Thursday, while others show warmer temperatures by Wednesday.