One factor that must be taken into consideration is technology, and in that I include access to adequate forms of energy.
The less technology a group has, and the less it is able to utilize available energy, the more it is dependent on a moderate and stable climate.
Given enough technology and available energy, a group could terraform Mars and do quite well. With poor technology and low energy availability an ice age would wipe out a group pretty readily.
Within limits most modern first-world populations could handle a 3 degree increase in temperature more readily than a 3 degree drop in temperature. It is now thought that a drop in temperature around AD 535-650 due to three volcanic eruptions was one factor in the fall of the eastern Roman Empire.
Late Antique Little Ice Age may have collapsed the eastern Roman Empire | Daily Mail Online
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