Mt. St Helen’s spewed up to 1980 meters (6500 ft) and it was a bit cooler that summer - But the worst in our life times was Pinatubo - 10 x’s Mt. St Helens. That first summer here in the North East was downright cold and it took a few years to recoup. It’s ash went up 21 miles!
There WAS no summer here that year, and a looong time for the summers to get back to normal - ah, not that I was around in 1883)
Your numbers are off. Mt. St. Helens had an ash cloud that reached 80,000 ft during the 1980 cataclysmic eruption. Even minor eruptions are aircraft hazards for aircraft at 30,000 ft.
Djibouti’s got a volcano? Get yer ash outta there!
When can check with Squantos because I believe that is the year he finally graduated from high school!