Photo taken on Feb. 13, 2015 shows snow-covered Potala Palace in Lhasa, capital of southwest China's Tibet Autonomous Region. A snow began to fall in Lhasa Friday morning, and was up to 17.3 mm by noon. (Xinhua/Liu Kun)

Photo taken on Feb. 13, 2015 shows snow-covered Jokhang Temple in Lhasa, capital of southwest China's Tibet Autonomous Region. A snow began to fall in Lhasa Friday morning, and was up to 17.3 mm by noon. (Xinhua/Liu Kun)

Photo taken on Feb. 13, 2015 shows snow-covered Potala Palace in Lhasa, capital of southwest China's Tibet Autonomous Region. A snow began to fall in Lhasa Friday morning, and was up to 17.3 mm by noon. (Xinhua/Liu Kun)

A girl plays with snow near the Potala Palace in Lhasa, capital of southwest China's Tibet Autonomous Region, Feb. 13, 2015. A snow began to fall in Lhasa Friday morning, and was up to 17.3 mm by noon. (Xinhua/Liu Kun)

Photo taken on Feb. 13, 2015 shows snow-covered Potala Palace in Lhasa, capital of southwest China's Tibet Autonomous Region. A snow began to fall in Lhasa Friday morning, and was up to 17.3 mm by noon. (Xinhua/Liu Kun)

Photo taken on Feb. 13, 2015 shows snow-covered Potala Palace in Lhasa, capital of southwest China's Tibet Autonomous Region. A snow began to fall in Lhasa Friday morning, and was up to 17.3 mm by noon. (Xinhua/Liu Kun)

People walk in snow in Lhasa, capital of southwest China's Tibet Autonomous Region, Feb. 13, 2015. A snow began to fall in Lhasa Friday morning, and was up to 17.3 mm by noon. (Xinhua/Liu Kun)