The National Climate Data and Information Archive, operated and maintained by Environment Canada, contains official climate and weather observations for Canada. Climate elements, such as temperature, precipitation, relative humidity, atmospheric pressure, wind speed, wind direction, visibility, cloud types, cloud heights and amounts, soil temperature, evaporation, solar radiation and sunshine as well as occurrences of thunderstorms, hail, fog or other weather phenomena are warehoused in a digital database. Access to selected portions of this data, as well as related products such as CD-ROMs and climate normals and averages are available on this web site. Information regarding obtaining extremes, monthly summaries, microfilm, microfiche, paper documents and technical documents, is also available.