On July 11, 1921, Ironwood recorded a record high minimum temperature of 78. It was undoubtedly hard to sleep on the Gogebic Range during this era before air conditioning. To make matters worse, another record-high low temperature of 77 degrees was registered the next morning.
This stifling heat was part of wide-spread hot weather during July 1921. Marquette had its hottest month by a wide margin with a mean temperature of 72.4 degrees. The next closest month is August 1947 at 70.9 degrees.
The heat wave covered a good share of the northeastern portion of the country (Image above). Chicago had 40 consecutive nights (June 20-July 30) with a low of 70 degrees or above. The heat was also felt across the Atlantic. July 28, 1921 was one of the hottest days on record in Switzerland. Breslau reached 102, while in Strasbourg, France the mercury topped out at 104.
Imagine today's media covering the heat of 1921. Back 93 years ago, it was summer. In 2012, it would be a portent of coming doom.