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This climate type is dominated by the winter season, a long, bitterly cold period with short, clear days, relatively little precipitation mostly in the form of snow, and low humidity. It is located north of the humid continental climate, from about 50° to 70° N, in a broad swath extending from Alaska to Newfoundland in North America and from northern Scandinavia to Siberia in Eurasia. In Asia the Siberian anticyclone, the source of continental polar air, dominates the interior of the continent. The North American representative of this climate is not as severe but is still profoundly cold. Mean monthly temperatures are below freezing for six to eight months, with an average frost-free period of only 50-90 days per year, and snow remains on the ground for many months. Summers are short and mild, with long days and a prevalence of frontal precipitation associated with maritime tropical air within traveling cyclones. Annual precipitation totals are mostly less than 500mm (19.69 in), with a concentration in the summer.
The Köppen Climate Classification subtype for this climate is "Dfc". (Continental Subarctic Climate).
The average temperature for the year in Stewart is 43.1°F (6.2°C). The warmest month, on average, is July with an average temperature of 59.2°F (15.1°C). The coolest month on average is January, with an average temperature of 26.6°F (-3°C).
The highest recorded temperature in Stewart is 91.6°F (33.1°C), which was recorded in June. The lowest recorded temperature in Stewart is -14.1°F (-25.6°C), which was recorded in December.
The average amount of precipitation for the year in Stewart is 73.5" (1866.9 mm). The month with the most precipitation on average is October with 10.9" (276.9 mm) of precipitation. The month with the least precipitation on average is June with an average of 2.6" (66 mm). There are an average of 215.3 days of precipitation, with the most precipitation occurring in October with 23.4 days and the least precipitation occurring in February with 15.2 days.
In terms of liquid precipitation, there are an average of 190.6 days of rain, with the most rain occurring in October with 23.2 days of rain, and the least rain occurring in February with 10.3 days of rain.
In Stewart, there's an average of 224.5" of snow (0 cm). The month with the most snow is January, with 64.1" of snow (162.8 cm).