was the 1816 freeze caused by the Icelandic volcano?
Nope. It was caused by pollutants from coal-fired electric plants and the leaking of improperly disposed nuclear waste material from power plant reactors.
I thought it was also due to a Minimum Dalton or Maunder...
“Was the 1816 freeze caused by the Icelandic volcano?”
It was great great great great great grandfather Bush’s fault.
No, it was caused by the 1815 volcano in the East Indies (present-day Indonesia).