Surface Weather and Marine Observation Markup Language (SWOB-ML) is an XML format based on the OGC Observations and Measurements standard.
This format is used by Environment Canada to publish detailed and highly-frequent weather station information from both EC and third-party sources across Canada.
Documentation for the format is available here:
https://dd.weather.gc.ca/observations/doc/
And sample data by date and station (CVOO has good info) is available here:
https://dd.weather.gc.ca/observations/swob-ml/
