Canada's climate is not really cold all year in winter, the temperature falls below freezing point, that's the time when it's really cold. And on the summer, the southern province often experience humid weather, and temperature that can surpass over 30 Celsius. It kind of depends on "where" in Canada you're referring to.
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Egypt was referred to as gift of the Nile.
Serfs were mostly peasant farmers who provided labor in their masters land. Peasants would pay the lord by working for them in exchange to use their lords land to generate their own food. Serfs did not have money. they were basically slaves. They would work at least three times a week. The serf was bound to work in a single manor. The status of serf was passed down to their children.