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Contained within the 1st Edition (1906) of the Atlas of Canada is a plate that shows 9 maps. Four maps show the average possible hours of sunshine for Canada in the summer months. There is a map for June, July, and August, in addition to a map combining these months. In the northern portion of...

Contained within the 2nd Edition (1915) of the Atlas of Canada is a plate comprised of 12 maps of isothermal lines. One map for each month of the year. These lines are drawn at intervals of 5 degrees Fahrenheit. The isolines were deduced from yearly observations collected by the Meteorological...

Contained within the 2nd Edition (1915) of the Atlas of Canada is a plate comprised of 11 maps. The two maps at the top of the plate show isothermal lines for summer and for the entire year, with temperature units measured in Fahrenheit. The annual isothermal lines follow an Easterly and Westerly...

Contained within the 2nd Edition (1915) of the Atlas of Canada is a plate that shows 9 maps. Four maps show the average possible hours of sunshine for Canada in the summer months. There is a map for the entire summer and individual maps for each of the summer months (June, July, and August. The...

Contained within the 3rd Edition (1957) of the Atlas of Canada is a plate that shows four maps, one for each of January, April, July and October showing mean sea-level pressure in millibars. These maps were prepared from atmospheric pressure readings taken daily at 00, 06, 12 and 18 hours G.M.T....

Contained within the 3rd Edition (1957) of the Atlas of Canada is a plate consisting of four maps, two showing wind and two showing sunshine. On the wind maps, the percentage frequency of the wind for winter and summer from each direction is represented by means of wind roses. Wind roses show...

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...