Yet another blast of arctic air invaded parts of the central U.S. wrapping up a cold month of November and kicking off December, particularly in the northern Rockies, northern Plains and parts of the Upper Midwest.

(MORE: November Shattered Cold, Snow Records)

The National Weather Service issued wind chill advisories and warnings for a large swath of the Upper Midwest through Monday morning. Wind chills had plunged into the 30s below zero early Monday near the U.S./Canadian border from northern Minnesota to northeast Montana. Subzero wind chills were felt as far south as the northwest Texas panhandle.

Actual air temperatures were extremely cold in some spots, especially for so early in the season. Reported lows Monday morning, December 1 included:

* 28 below zero at a site 13 miles northeast of Poplar, Montana
* 27 below zero in Three Forks, Montana
* 26 below zero in Clark, Wyoming
* 24 below zero in Jamestown, North Dakota
* 23 below zero in Bozeman, Montana
* 22 below zero in Bottineau, North Dakota
* 21 below zero in Wolf Point, Montana as well as Greybull, Wyoming
* 19 below zero in Opal, South Dakota
* 17 below zero in Grand Forks, North Dakota
* 11 below zero near Marquette, Michigan

Frostbite can develop on exposed skin in as little as 30 minutes under these conditions, so it's important to dress warmly and cover up as much as possible. Hypothermia -- a dangerous lowering of the body's core temperature -- is also a danger if you are exposed to these conditions for long periods of time, particularly if you're not dressed in layers or if your clothes get wet.

Latest Blast Brings Wild Temperature Swings

The latest arctic blast, like earlier cold-air intrusions this fall, arrived in dramatic fashion.

For instance, the temperature at 2:55 p.m. CST Saturday was 76 degrees in O'Neill, Nebraska. At 2:55 p.m. Sunday, it was just 15 degrees with a wind chill of 2 below zero -- a 61-degree drop in the actual temperature and a 78-degree drop in the feels-like temperature.

(MORE: November 2014's Wildest Temperature Swings)

When the cold air blasted into Denver Sunday morning, at one point there was a 30-degree difference in temperatures just within the city limits of Denver alone. The arctic front brought thick freezing fog that made mayhem of post-Thanksgiving flight schedules at Denver's main airport.

(MORE: Freezing Fog Diverts Dozens of Denver Flights)

Earlier, the front sent temperatures crashing in Montana. Great Falls went from a high of 56 late Friday morning to a low of 1 below zero late Friday evening; 1 below zero became their high for Saturday, and the city set a record low of 22 below zero Sunday morning, the city's coldest November reading since 1985.

MORE ON WEATHER.COM: High-Definition Maps of Mid-November 2014 Polar Plunge