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Contained within the 3rd Edition (1957) of the Atlas of Canada is a plate that shows four maps of the mean daily temperatures for January, April, July and October averaged over the 30 year period, circa 1921-1950. The mean temperature for any day is the average of the maximum and minimum...

Contained within the 3rd Edition (1957) of the Atlas of Canada is a plate that shows six maps of the Canadian ranges in temperature. The map entitled Mean Annual Maximum Temperature shows the mean of the highest temperature recorded each year from 1921 to 1950 inclusive. The Mean Annual Minimum...

Contained within the 3rd Edition (1957) of the Atlas of Canada is a plate that consists of three maps based on the occurrence of a temperature of 32 degrees F (0 degrees C) or lower in a standard thermometer shelter at a level of four feet above the ground. Frost may occur at grass level when the...

Contained within the 3rd Edition (1957) of the Atlas of Canada is a plate that shows two maps for the annual total precipitation. Annual precipitation is defined as the sum of rainfall and the assumed water equivalent of snowfall for a given year. A specific gravity of 0.1 for freshly fallen snow...

Contained within the 3rd Edition (1957) of the Atlas of Canada is a plate with three maps that show the mean annual number of days with measurable precipitation, the mean annual number of days with measurable snowfall, and the variability of annual precipitation. A day with sufficient measurable...

Contained within the 3rd Edition (1957) of the Atlas of Canada is a plate that shows four maps of the mean precipitation for spring (March to May), summer (June to August), fall (September to November) and winter (December to February). The total precipitation for any season is the sum of the...

Contained within the 3rd Edition (1957) of the Atlas of Canada is a map that shows the snow cover data, referring primarily to the presence and total depth of a snow cover on the surface of the earth, across Canada. This is in contrast to data characteristics of snow cover depth, which increases...

Contained within the 3rd Edition (1957) of the Atlas of Canada is six maps that show the humidity and fog occurrences across Canada. Two maps on the top that show the mean mixing ratios for January and July, respectively. Mixing ratio is defined as the ratio of the mass of the water vapor to the...

Contained within 3rd Edition (1957) of the Atlas of Canada is a map that shows the division of Canada into climatic regions according to the classification of the climates of the world developed by W. Koppen. Koppen first divided the world into five major divisions to which he assigned the...

Contained within the 3rd Edition (1957) of the Atlas of Canada is a map that shows the typical weather situations by means of four surface weather maps: for February 18th, circa 1954; April 19th, circa 1955; July 3rd, circa 1955; and October 12th, circa 1954. All maps are based on data of 1:30...