National Weather Service Weather Forecast Office

The last three months (March-April-May) have continued to record and sustain a long term above normal temperature trend across the region.

The DNR / University of Minnesota Climate Working Group  has a web story about the record warm spring of 2012 temperatures for the entire state of Minnesota, including the Official National Weather Service Climatological Data Sites of the Twin Cities and St Cloud. For their full web story go to climate.umn.edu/doc/journal/warm_spring2012.htm

All indications are, that the state of Wisconsin has also had a record warm spring, just like Minnesota. If it was not the warmest Wisconsin spring on record, it was in the Top Five. 

The main driver for the extremely warm spring, was the month of March 2012. However April and May 2012 were also above average, but they were nowhere near the warmest. 
The fact is, that March 2012 was so over-the-top warm that it has almost single handedly carried the spring of 2012 averages to the number one warmest.

Focusing on West Central Wisconsin, in Eau Claire where the historical combined climate dates back to the 1890's, it was the warmest spring on record (noted on the chart by the circle.) The second warmest spring on record was 1977.

Focusing on Central Minnesota, in St Cloud where the historical combined climate dates back to the 1890's, it was the warmest spring on record. (noted on the chart by the circle.) The second warmest spring on record was 1977.

Focusing on East Central Minnesota, in Minneapolis St Paul, where the historical combined climate dates back to the 1870's, it was the warmest spring on record. (noted on the chart by the circle.) The second warmest spring on record was 1977.