Winters are cold with mild temperatures during the day and cold nights. In contrast, this low pressure system weakens in the winter, which combined with strong southerly winds results in a drier season due to weaker easterly winds. Buenos Aires, the capital of Argentina, has a temperate climate, which is classified as a humid subtropical climate (Cfa) under the Köppen climate classification with four distinct seasons. Air temperatures are slightly lower in December and February. Ministro Pistarini (Ezeiza) Airport Guide.  On average, Buenos Aires is warmer than the surrounding areas by 1.5 to 3.5 °C (2.7 to 6.3 °F) owing to the urban heat island.  Cold fronts are more common during winter than in summer as the South Atlantic and South Pacific highs are at their southernmost positions during summer, making it difficult for cold fronts to enter. During the days, enjoy the beautiful and varied parks of the city, like the Botanical Garden or Rosedal. The central observatory refers to the weather station located in Villa Ortúzar that has been operational since 1906. During this time tourism in Buenos Aires is at its peak and prices will be as well. A good pair of jeans and a flannel will be perfect for early winter.  The same polar air affected many parts of the country, bringing cold temperatures and snow in coastal parts of Patagonia. , The climate of Buenos Aires is dominated by the semi–permanent South Atlantic High throughout the year. Winter is low tourist season, and enjoys lower humidity than the fall, thanks in part to strong southerly winds beginning to blow through the city.  Because the Sudestada brings the highest wind speeds (particularly when these winds are combined with the astronomical tides), the Sudestada is responsible for floods that occur in low-lying areas. Being located in the Pampas, Buenos Aires has variable weather due to the passage of contrasting air mass – the cold, dry Pampero from the south and warm, humid tropical air from the north. In Buenos Aires, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year..  Based on 111 years of weather observations (1906–2016) from the central observatory, 61 years (55% of the time) have seen stormy weather occurring on days close to 30 August, although not all of these have led to heavy precipitation.  Cold waves can occur in these months in which periods of cold temperatures can persist for days. , According to the central observatory, which has one of the most reliable and oldest records in South America, the highest temperature in Buenos Aires, 43.3 °C (109.9 °F), was recorded on 29 January 1957 while the lowest temperature recorded is −5.4 °C (22.3 °F) on 9 July 1918. Summer is the peak tourist season and has higher hotel rates. Weather conditions with updates on temperature, humidity, wind speed, snow, pressure, etc. Buenos Aires gets extremely hot and humid in January and February. :39, At the beginning of autumn, temperatures are warm to hot in the afternoon while nights and mornings are mild. The temperatures start to cool considerably in March and continue to drop throughout the season, hovering between the low 70s and high 50s Fahrenheit. December weather forecast for Buenos Aires, Argentina. 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