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This climate is characterized by relatively high temperatures and evenly distributed precipitation throughout the year. This climate type is found on the eastern sides of the continents between 20° and 35° N and S latitude. In summer, these regions are largely under the influence of moist, maritime airflow from the western side of the subtropical anticyclonic cells over low-latitude ocean waters. Temperatures are high and can lead to warm, oppressive nights. Summers are usually somewhat wetter than winters, with much of the rainfall coming from convectional thunderstorm activity; tropical cyclones also enhance warm-season rainfall in some regions. The coldest month is usually quite mild, although frosts are not uncommon, and winter precipitation is derived primarily from frontal cyclones along the polar front.
The Köppen Climate Classification subtype for this climate is "Cfa". (Humid Subtropical Climate).
The average temperature for the year in Karuizawa is 44.0°F (6.7°C). The warmest month, on average, is August with an average temperature of 69.0°F (20.6°C). The coolest month on average is January, with an average temperature of 26.0°F (-3.3°C).
The average amount of precipitation for the year in Karuizawa is 46.6" (1183.6 mm). The month with the most precipitation on average is September with 7.8" (198.1 mm) of precipitation. The month with the least precipitation on average is December with an average of 0.7" (17.8 mm).