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The first heat wave of a hot summer was underway on this date in 1911. Temperatures warmed quickly to the 70s and 80s during the first three weeks of May. Then, starting on the 21st, temperatures reached the 90s, peaking on the 22nd with 99 in Cavendish, 96 in St. Johnsbury – the hottest ever there in May, and 92 in Burlington, equaling their hottest May temperature, until it was broken with 93 on this same date in 1977.