Natural Resources Canada

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 four maps of certain climatic aspects of the growing seasons. The first map shows the mean annual length of the growing season throughout Canada, assuming the growing season to be that part of the year 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...

Contained within the 3rd Edition (1957) of the Atlas of Canada is a map that shows the distribution of various types of weather-reporting stations, as well as the way in which Canada is divided for purposes of issuing weather information to the public. One map shows the seven Public Weather...

Contained within the 3rd Edition (1957) of the Atlas of Canada is a map that shows drainage basins and river flow. The delimited drainage basins cover all Canadian land and fresh water areas. The areas of many drainage basins are written on the map. These areas do not include diversions (thus,...

Contained within the 3rd Edition (1957) of the Atlas of Canada is a map that shows the profiles of 17 major rivers together with the positions of important cultural and physical features connected with them. These include hydro-electric power developments (circa 1955) and lakes and a reference...

Contained within the 3rd Edition (1957) of the Atlas of Canada is a map that shows the areas of principal soil groups which are divided into 48 subgroups. Two graphs are included. One is a bar chart showing the principal soil groups and their distribution by provinces and territories. The other...

Contained within the 3rd Edition (1957) of the Atlas of Canada is a plate that shows four soil map sections of soil maps that were being prepared by the Experimental Farms Service of the Federal Department of Agriculture in cooperation with the Provincial Departments of Agriculture and the...

Contained within the 3rd Edition (1957) of the Atlas of Canada is a map that shows the ranges of a few of the many thousands of insects, ticks and spiders species that are found in Canada. There are 20 maps showing the ranges of 52 separate species. Ranges depend on the distribution of suitable...

Contained within the 3rd Edition (1957) of the Atlas of Canada is a map that shows the vegetation regions, and 19 smaller-scale maps showing distributions of particular plant species. The main map shows the distribution of 17 natural vegetation types and also shows non-vegetated areas (existing...

Contained within the 3rd Edition (1957) of the Atlas of Canada is a map that shows the extent of forest regions of Canada. It displays the extent of forest regions of Canada under natural conditions. Therefore, although many parts of Southern Canada are no longer forested, no attempt has been...

Contained within the 3rd Edition (1957) of the Atlas of Canada is a map that shows the portions of land in four condensed maps which illustrate the kind of forest maps that were being prepared from air photographs with a minimum of groundwork by the Forestry Branch of the Department of Northern...