请提供以下城市的当前天气，并将结果以JSON格式输出：北京、上海、广州。并且数据应包括温度、湿度、风速和天气状况。
user
```json
{
  "cities": [
    {
      "name": "北京",
      "temperature": "22°C",
      "humidity": "60%",
      "wind_speed": "10 km/h",
      "weather_condition": "晴"
    },
    {
      "name": "上海",
      "temperature": "24°C",
      "humidity": "70%",
      "wind_speed": "15 km/h",
      "weather_condition": "多云"
    },
    {
      "name": "广州",
      "temperature": "28°C",
      "humidity": "75%",
      "wind_speed": "8 km/h",
      "weather_condition": "阴"
    }
  ]
}
```
assistant