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The climate of Ontario varies by season and location. [19] It is affected by three air sources: cold, dry, arctic air from the north (dominant factor during the winter months, and for a longer part of the year in far northern Ontario); Pacific polar air crossing in from the western Canadian Prairies/US Northern Plains ; and warm, moist air from ...
The Mixedwood Plains Ecozone is the Canadian ecozone with the most southern extent, covering all of southwestern Ontario, and parts of central and northeastern Ontario and southern Quebec along the Saint Lawrence River. It was originally dominated by temperate deciduous forest growing mostly on limestone covered by glacial till.
The Köppen climate classification system was modified further within the Trewartha climate classification system in 1966 (revised in 1980). The Trewartha system sought to create a more refined middle latitude climate zone, which was one of the criticisms of the Köppen system (the climate group C was too general). [10]: 200–1
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The ecoregion includes most of the southern Canadian Shield in Ontario and Quebec north and west of the Saint Lawrence River lowlands. The portion in Northeastern Ontario includes the eastern shores of Lake Superior , Greater Sudbury , North Bay, Ontario , Lake Nipissing , the Clay Belt and Temagami .
However, some confusion can exist in discussing buildings and HVAC, where "climate zone" can refer to the International Energy Conservation Code zones, where Zone 1 is warm and Zone 8 is cold. Other hardiness rating schemes have been developed as well, such as the UK Royal Horticultural Society and US Sunset Western Garden Book systems.
Continental climates are considered as temperate climate varieties due to their location in the temperate zones, [2] [3] but are classified separately from other temperate climates in the Köppen climate classification system where they are identified by their first letter, a capital D. In the Trewartha climate classification, they are ...
ID Ecozone Total area (km²) 01 Arctic Cordillera: 242,190 02 Northern Arctic: 1,507,872 03 Southern Arctic: 839,760 04 Taiga Plains: 652,125 05 Taiga Shield