I'm not meteorologist, but love aviation, so dig these things deep. For me, this case most probably example of Great climate event, which for some reason misse

I'm not meteorologist, but love aviation, so dig these things deep. For me, this case most probably example of Great climate event, which for some reason missed by scientists. What could trigger it, is light mystery, because even now scientific coverage of Earth is not constantly complete, and in 1862 existed whole regions without good scientific network (now, only some countries closed for science). Most probably, reason was some fluctuations of Gulf Stream or Supervolcano.