Ocean Air Temperatures in Newfoundland tend to be midway between those of Winnipeg and Vancouver. This is true of both average temperatures and extremes. In comparison, Winnipeg's is 38.9 and Vancouver's is 14.8. Incursions of moist, mild Atlantic air are frequent. Spring comes rather slowly and is short.
Summer is also short and cool.
With afternoon highs in the low twenties, they are warm enough to be comfortable and yet cool enough to permit vigorous activity. The frost-free period varies widely. In some locations, where the landscape causes cold air to collect at night, frost-free durations may be only 70 days on average. Newfoundland tends to start around June 8 and to end by September 15. Generally, frost is not a limiting factor for the growing of root vegetables, such as potatoes and turnips, which are the most important of the few crops grown in Newfoundland.