Historical perspective on the Russian heat wave:
Consider this from Ponder the Maunder–
Dalton Minimum- 1790 A.D -1820 A.D.
Napoleon Bonaparte was another one of history’s well known generals who faced the extreme cold of the Little Ice Age. During Napoleon’s retreat from Russia, only 30,000 of the 600,000 troops survived on the way back to France in the Winter of 1812.
The extreme cold of the Dalton Minimum was worsened by the eruption of Mount Tambora in 1815, which cooled the temperatures even further because its debris went into the atmosphere, blocking the suns rays. The following year is known as the year without a summer and caused a large migration of people from New England to the west.