Some trees need a period of chilling, such as apples and pears, in order to bear fruit. If the climate in which they are grown does not provide enough chilling (in terms of low temperature and period of time that such low temperature sustains) the tree will not bear fruit. That is why some trees would not be successful in warmer areas that do not provide such low temperatures. That's why also some trees would fail in bearing fruit if the winter of some year does not prove cold enough. This takes place more in temperate climates where winter is not always as cold as desired by such trees. Every type of those trees has its own chilling requirements.
We sometimes put the seeds of some trees in the fridge in order to enable them break out of their state of seed dormancy. This occurs naturally in nature when seeds are exposed to cold climate followed by a period of warmth.