I??ve showed on this blog a number of times how cool it was during the summer of the 1960s. A number of record lows were set during this decade; many of these records still stand today. Yet, there were heat waves on occasion during this time. One of them began on the last couple of days of June 1963. Marquette??s Weather Bureau office recorded a 90 on the 29th. The next day city posted the hottest temperature in all the U.P. with a sweltering high of 101 degrees. The present site of the National Weather Service near Negaunee reached 99??the first time this all-time record high was reached (The most recent 99 was on July 28, 1988). Ironwood hit 97 degrees both on the 30th and July 1st. Munising set a record at 96, while the Houghton County Airport site topped out at 93.
The high temperature in the City of Marquette is likely inflated somewhat. For years, the observation point for the U.S. Weather Bureau was on the black-top roof of the present-day site of the Post Office and Federal building on Washington Street. Readings taken at this site were probably a couple of degrees too warm. However, the day in question, June 30, 1963, was a perfect set up for a heat wave across Upper Michigan. General low pressure developed to the west in the Northern Plains setting up a brisk southwesterly flow over the U.P. (Image above)
The summer of ??63 was moderately warm through the first two-thirds. June ended 1.2 degrees above average, while July was 1.9 degrees above normal. In August the pattern shifted to cool; the mean temperature came in 1.9 degrees below the long-term average.
June 2014 will be the second straight month with temperatures above average. May was a modest 0.4 degrees above average, while June will likely be closer to one degree above average. On the other hand, July will at least start with a cooling trend that should take temperatures well below average in the run up to the Fourth of July holiday.