In the New England area, many wealthy families living in cities during the 19th century had summer homes in the mountains. This was to flee the onset of yellow fever and other epidemics which often struck in the summer months, when city plumbing problems and stagnant horse manure in the streets caused a health hazard. Winterization would take place each Fall when the families returned to the cities (often when school started). In those days, winterization just referred to a lock-down of all movable parts as protection from winter storms. An example of such a summer home that needs to be winterized each fall is the scene of the movie On Golden Pond, which was filmed on Squam Lake. 
This site contains all information about Winterizing.
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