On April 21, 1980, Ada, Minnesota recorded 100F, which some people blamed on particulates from Mt. St Helens.
Apr 21, 1980, page 1 – Des Moines Tribune at Newspapers.com
The volcano blew its top on May 18, 1980 and a few weeks later Dallas, Texas had (by far) their worst heatwave on record.
Mount St. Helen’s erupts on July 22, 1980 in Washington State. (AP Photo)
https://www.ncei.noaa.gov/pub/data/ghcn/daily/all/USC00419532.dly
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I remember quite a few really warm summers in the upper great plains during the 80s