Frost

Contained within the 4th Edition (1974) of the Atlas of Canada is a collection of five maps. Two maps show, for fertile regions, the average date of the last frost in spring and the average date of the first frost in autumn. The three remaining maps show the median depth of snow cover at a scale of 1:35 000 000 for all of Canada in inches for the dates September 30th, October 31st and November 30th. | 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 temperature in the shelter remains above freezing. On the other hand, freezing temperatures in the thermometer shelter are a definite indication of frost at grass level. The maps, showing the mean dates of the first occurrence in the fall and the last occurrence in the spring of a temperature of 32 degrees F (0 degrees C), are representative of different localities in the country. The mean annual frost-free period is the average number of days between the last frost in the spring and the first frost in the fall.

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Champ Valeur
Dernière modification janvier 16, 2026, 21:09 (TU)
Créé le janvier 16, 2026, 21:09 (TU)
contains_pii non
crisis_categories Tempêtes hivernales
criticality_level Faible
data_formats JPG; PDF
fair_openness Level 2 - Machine-readable
geographic_scope Canada
sensitivity_level Faible
source_inventaire Inventaire_W
source_url https://open.canada.ca/data/en/dataset/455a8376-95dd-51fb-a201-8f981f1a4fcb
subject nature_and_environment, science_and_technology
update_frequency as_needed
year_most_recent 2022-03-14 19:51:18.611000
year_start 2016-09-24 11:07:01.490000