The ECMS Weather Server is available only for non-commercial (not for sale) use and must provide a link to Environment Canada's website as a requirement of using the data that it collects. On a customizable schedule the server will poll the Environment Canada website for weather stations that you select, collecting all available data and even using that data to calculate further useful statistics and values.
Currently the available data includes a full 5 day forecast, the current weather conditions, the previous days major statistics, moon rise and set data, and sun rise and set data. Further values that are calculated are the days Humidex readings during the summer and Windchill values in the winter.