The streak is over.
But it's been broken.
May's average temperature was 58.5 degrees – less than 1 degree below normal (0.6 degrees to be exact), the National Weather Service in the Twin Cities says. It marks the first month since August 2015 where the average monthly temp was below average.
The preliminary climate report from the National Weather Service shows 14 of the 31 days in May saw below-normal temps for that specific day, including the snow we got to start the month and that "cold snap" in the second half of the month. From May 18-25, temps were up to 13 degrees colder than normal.
And it's not just the Twin Cities. St. Cloud saw an average monthly temp of 55.8 degrees, which is 1.8 degrees below normal.
The Minnesota DNR says the chance of 20 straight months of above-average temps is about 0.000001 percent.
Minnesota is 'warming rapidly'
The Twin Cities hasn't had a stretch of 10 or more "cool months" since the mid-1960s, the National Weather Service Twin Cities said last month. And since 1970, above-average temperatures have been more likely to happen than below-average temperatures. That indicates the state is "warming rapidly," the DNR says. (The agency gauges the “normal” temperature based on data from 1981 to 2010 – so it isn’t being compared to temps from a century ago.)
This is what's happening globally, too. The National Oceanic and Atmospheric Administration says the combined average temperature for land and ocean surfaces in April of 2017 was 1.62 degrees above the 20th century average. (The May 2017 data will be released later this month.)
NASA says the current trend of warming temperatures is extremely likely to be the result of human activity in the past 100 years, putting its confidence in the claim at 95 percent. NASA points to more extreme weather events (like storms or tornados), rising sea levels, and shrinking ice sheets as some of the effects.