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We know it gets cold in Minnesota. All you have to do is step outside lately. 

But an interesting pattern has persisted for the last few years in the Upper Midwest. While most of the earth is recording persistent warmer than average temperatures, Minnesota and the Upper Midwest has been running colder than average.

October was the warmest ever recorded globally 

according to the European Union’s Climate Change Service. 

But an anomalously cold pattern is clearly evident across western and central North America. Minnesota rides the eastern edge of the coldest place on earth relative to the 1981-2010 average. It shows up as a big blue blob across North America. 

This analysis from the Midwest Regional Climate Center shows temperatures in most of Minnesota have been roughly 5 degrees colder than average over the past 30 days.

This pattern has caught my eye over the past few years. While much of the globe is trending consistently warm, Minnesota and the Upper Midwest have shown a persistent cold bias. This trend shows up in global temperature patterns over the past 12 months. See the blue shades across central North America?

Global surface temperature data shows the past five years are the warmest on record globally; 2018 was the fourth warmest year globally and 2019 is on pace to be the second- or third-warmest year globally.

So, why is Minnesota and the Upper Midwest showing a consistent cool bias in a rapidly warming world? That’s a question I’m not sure we have a clear answer to yet. 

But one key may lie in ocean temperatures in the North Pacific. The so-called “blob” is a huge area of unusually warm ocean water in the North Pacific. It emerged in 2014 and has resurfaced again this year. 

This massive warm water zone can impact jet stream patterns in the atmosphere above. It may one of the primary reasons Alaska has seen the warmest year on record. And downstream upper-air teleconnections can push cold air intrusions into the Midwest.

Capital Weather Gang’s Ian Livingston elaborates

 on some of the observed downstream weather pattern impacts from the blob.

 The blob can shift the jet stream to mimic La Nina jet stream patterns over the lower 48 states. That could be one reason we’re seeing persistent cold air intrusions into Minnesota and the Upper Midwest.

Big picture: Regional variations in a warmer world

The big picture with climate change is that even as the globe as a whole gets measurably warmer, there are still regional variations. The last few years seem to suggest that one of those colder regions has set up across the middle of North America.

Scientists are still learning about how the regional impacts of a rapidly warming planet are playing out. 

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Minnesota is among the coldest places on earth relative to average lately. 

October global temperatures relative to 1981-2010 average 

European Union Climate Change Service

30-day temperature departure from average 

Why is Minnesota one of the coldest places in a warming earth?

Go Deeper.

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