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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 Lang Son is 71.0°F (21.7°C). The warmest month, on average, is June with an average temperature of 81.0°F (27.2°C). The coolest month on average is January, with an average temperature of 57.0°F (13.9°C).
The highest recorded temperature in Lang Son is 104.0°F (40°C), which was recorded in May. The lowest recorded temperature in Lang Son is 30.0°F (-1.1°C), which was recorded in January.
The average amount of precipitation for the year in Lang Son is 55.7" (1414.8 mm). The month with the most precipitation on average is July with 10.8" (274.3 mm) of precipitation. The month with the least precipitation on average is January with an average of 0.9" (22.9 mm). In terms of liquid precipitation, there are an average of 84.3 days of rain, with the most rain occurring in July with 15.0 days of rain, and the least rain occurring in January with 1.9 days of rain.