明天进“三九”！北京周五山区零星飘雪，大风降温紧随

Weather Forecast - The weather in Beijing is expected to be mostly cloudy with sunny intervals on January 7, with a maximum temperature of 4℃ in the plains and 0-3℃ in mountainous areas [7] - Nighttime temperatures on January 7 are forecasted to drop to -7℃ in the plains and -12 to -10℃ in mountainous regions [7] - On January 8, the daytime will be sunny with maximum temperatures of 5℃ in the plains and 2-4℃ in mountainous areas [8] - January 9 will see cloudy weather with possible light snow in mountainous areas, and maximum temperatures of 7℃ in the plains and 4-6℃ in mountainous regions [9] Temperature Trends - The highest temperature recorded on January 6 was 7.7℃, while the lowest was -2℃ [5][6] - The upcoming week will experience a significant drop in temperatures, especially at night, with warnings to dress warmly [12] - The overall trend indicates a dry weather pattern across most of the country, with significant temperature fluctuations, particularly in the Jiangnan and South China regions [14]