15 Beijing weather forecast.

(1) According to the information in the picture, we can know that the weather conditions of the day are: cloudy weather turns to sleet;

(2) According to the meaning of the wind symbol, the wind direction is northeast wind, and the wind force reaches about 6;

(3) The lowest temperature is -7℃, the highest temperature is 2℃, and the daily temperature difference is 9℃.

So the answer is: (1) cloudy; Sleet; (2) Northeast China; 6; (3)-7; 2; 9.