Climate Trends and Variations Bulletin
Much of Canadian economic and social activity is climate dependent. Understanding how Canada's climate is changing, in the context of global climate change, is important for developing adaptive responses. The Climate Trends and Variations Bulletin (CTVB) helps communicate to Canadians how Canada's climate has changed over the recent past and longer, over the period for which Environment Canada has climate observations.
The CTVB describes climate variability through maps of current and past departures from the mean (the 30-year average 1961-1990) temperature and precipitation conditions, both seasonally and annually. This approach provides visualization of the extent to which temperature and precipitation vary above and below longer term average conditions. Maps are presented for each season and year. The data are then analyzed to see if there are longer terms trends detectable against this backdrop of climate variability for Canada as a whole, and for 11 climate regions. This information is presented as graphs with trend lines to assess climate change over the period of record, starting in 1948 when nation-wide records became available.
The CTVB uses homogenized and adjusted station data for temperature and precipitation. These data have been adjusted to account for discontinuities in the data from non-climatic factors such as changes in observation methods or station location. See this brief description of the data and procedures used in the CTVB reports.
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