请问北京的气候特点是什么？
user
{
    "city": "北京",
    "climate_features": [
        {
            "description": "春季干燥多风"
        },
        {
            "description": "夏季炎热多雨"
        },
        {
            "description": "秋季晴朗少雨"
        },
        {
            "description": "冬季寒冷干燥"
        }
    ]
}
assistant