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This climate climate zone covers from about 44°N to 50°N latitude mostly east of the 100th meridian in North America. However, it can be found as far north as 54°N, and further west in the Canadian Prairie Provinces and below 40°N in the high Appalachians. In Europe this subtype reaches its most northerly latitude at nearly 61° N. Areas featuring this subtype of the continental climate have an average temperature in the warmest month below 22°C (22°F). Summer high temperatures in this zone typically average between 21-28°C (70-82°F) during the daytime and the average temperatures in the coldest month are generally far below the -3 °C (27°F) mark.
The Köppen Climate Classification subtype for this climate is "Dfb". (Warm Summer Continental Climate).
The average temperature for the year in Nagano is 52.0°F (11.1°C). The warmest month, on average, is August with an average temperature of 77.0°F (25°C). The coolest month on average is January, with an average temperature of 30.0°F (-1.1°C).
The highest recorded temperature in Nagano is 100.0°F (37.8°C), which was recorded in July. The lowest recorded temperature in Nagano is 2.0°F (-16.7°C), which was recorded in February.
The average amount of precipitation for the year in Nagano is 39.7" (1008.4 mm). The month with the most precipitation on average is September with 5.8" (147.3 mm) of precipitation. The month with the least precipitation on average is February with an average of 2.0" (50.8 mm). In terms of liquid precipitation, there are an average of 66.9 days of rain, with the most rain occurring in September with 8.1 days of rain, and the least rain occurring in November with 3.6 days of rain.