WBZ-TV weather person Barry Burbank shared some historical information about Boston heat waves:
Boston’s longest heat wave of 9 days lasted from July 3-11 in 1912. The next 3 on the list are all 8 days long. August 11-18, 2002 was the most recent followed by July 19-26, 1994 then August 10-17, 1944. August 1988 was also brutal with a 4-day heat wave from the 3rd through the 6th followed by a 7-day heat wave on the 9th through the 15th. It was the hottest August in 118 years featuring 11 days over 90 degrees bringing the 1988 total to 25 days which is double the average number. More recently, July 2011 was the 2nd hottest July on record but, surprisingly, there was only 1 heat wave lasting 4 days. During that spell, there was a new record set on the 22nd of the month at 103 degrees! July 2010 was the third hottest July on record with two-3 day heat waves. The longer the heat lingers, the greater the impact because it is accumulative and increasingly stressful to the human body.