Only time will tell, but climatologists with the Minnesota Department of Natural Resources believe 90-degree days in May are a good indicator for a hotter than normal summer. 

On average, there is one 90-degree day in May once every three years. But in 146 years of keeping track, there have only been 23 years in which the month of May produced multiple 90-degree days in the Twin Cities. 

This year is another, with Tuesday's forecast high in the mid-90s set to be a record, sixth consecutive day of 90+ degrees, which will rank second all time to the eight days of 90-degree heat in May 1934. 

The Twin Cities had 36 days of 90+ degrees in 1934, nearly triple the average of 13.  

"We find that years with multiple 90-degree days during May have tended to be followed by summers that also have relatively high numbers of 90-degree days," the DNR's climate journal notes. 

Today's Top Stories

– Risk of severe storms increases for much of Minnesota on Tuesday

– Stay informed by subscribing to Bring Me The Newsletter (free)

– Artists left homeless after devastating Lake Street blaze

The typical average is 13, but that number skyrockets 80 percent to 23 when there a multiple 90-degree days in May. 

There are only five previous years on record that produced four-plus 90-degree days in May, and each of those years resulted in more than 20 total 90-degree days. 

1. 1934: 36 total (8 in May)
2. 1874: 26 total (5 in May)
3. 1988: 44 total (4 in May)
4. 1987: 27 total (4 in May)
5. 1925: 20 total (4 in May)

More recently, there were 31 days of 90+ degrees in 2012, which followed a May that had a pair of 90-degree highs.