The average annual precipitation in these cities are:
Vancouver - 1457 mm
Edmonton - 456
Regina - 390
Toronto - 831
Halifax - 1468
Explanation:
Canada is enormous country, and of course it has large differences when it comes to the precipitation levels across its territory. In general, the closer a region is to the sea, the more precipitation it tends to get, to further a region is in the interior, the lower the precipitation. The exceptions of these rules are the areas in the interior that are around the Great Lakes, and the far north.
The Great Lakes are several enormous lakes which create a lot of humidity in the air, so despite being in the interior, the amount of precipitation is relatively good. The northern part of the country, despite being surrounded by sea, has very low precipitation levels, with the main reason being the polar climate.
This patterns can easily be seen by the five cities on the list. Vancouver and Halifax are located on places that are heavily influenced by the sea, so they have high precipitation levels. Toronto is right next to the Great Lakes and it has medium precipitation levels. Regina and Edmonton are located in the interior, far away from the wet air masses, thus they have relatively low precipitation levels.
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