THE VEGETATIVE AND FROST-FREE SEASONS OF THE PRAIRIE PROVINCES AND THE NORTHWEST TERRITORIES
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Abstract
A comparison is made of the changes in the lengths of the vegetative and frost-free seasons in the Prairie Provinces and the Northwest Territories, based on a mean daily temperature of 42° F. for growth and a minimum temperature of 32° F. for frost damage. Figures are included that show the broad details of the beginning and of the ending for both seasons. From these figures the lengths of the seasons may be deduced for various districts. A comparison is made of the average daily temperatures for the vegetative seasons at a number of representative places. The variability in the beginning and the ending of the frost-free season for a number of places is indicated by a table giving extreme, 25-percentile, 50-percentile, and 75-percentile dates. These values are shown graphically by a unique type of diagram that also shows the median length of the frost-free season.