TP 14371 - Transport Canada Aeronautical Information Manual (TC AIM)
See the Met section.
Aviation routine weather reports (METAR) are coded weather observations that are taken each hour at over 200 aerodrome and other locations in Canada. In addition, special weather reports (SPECI) are issued whenever weather conditions fluctuate about or are below specified criteria.
See MET 3.15.3 for the contents and decode instructions for these reports