How cold is it in the Upper Midwest? Cold enough that some thermometers can't even register it.

Agweek reader Landon Plummer from Hannah, N.D., sent in this photo of an old Agweek thermometer that can't quite keep up with the conditions.

"Not sure how old the thermometer is but it looks like it needs a few more negative numbers on it," Plummer said in an email.

Hannah is located in Cavalier County, N.D., just south of the Canadian border. A number of northeast North Dakota cities reported actual air temperatures of -38 early Wednesday morning, including Walhalla, Langdon, Cavalier, Cando and Rugby.

With a low temperature of -30, perhaps the creator of the thermometer was an optimist?