It seems like the winters are getting colder and the summers are getting hotter (even though here in California this has likely been the warmest Fall and Winter I've ever seen up until the last month. So, finally now with the rain coming temperatures are more normal for this time of year like around 45 to 55 or 60 degrees. But, before this 70 degree days were pretty normal while the drought was happening more than now until recently when the Atmospheric River trashed parts of California.
But, if you study how ice ages come about, first they start with global warming usually, then they move into phases where snow lasts longer and longer each season each year until the snow doesn't melt off at all north of say Mexico and from the Sierras in California to the Appalachian Range on the East Coast.
So, if we had another ice age anytime soon these would be the likely borders of the ice: the border of Mexico on the bottom. There would be no top but the North pole and then the Sierras and the Appalachian range because the oceans (The Pacific and Atlantic) would keep weather warmer along both coasts even if the ice extended all the way from the Sierras to the Appalachian mountains in the lower 48 states.
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