在全球气候异常多变的新世纪,今年7月的天气就更是莫测难料。中国北京7月的降雨天数达28天,比近30年同期平均降雨天数多了近1倍。7月上旬开始,美国加利福尼亚州持续高温热浪,洛杉矶西部温度甚至上升到创纪录的48摄氏度,热浪导致141人死亡,高温使得用电需求大增,7月24日加州用电 In the new century with unusually changing global climate, the weather in July this year is even more unpredictable. In Beijing, China, the number of rainy days in July reached 28 days, almost double the average number of days in the same period in recent 30 years. In early July, high heat waves continued in California, California. The temperature in western Los Angeles even risen to a record 48 degrees Celsius. The heat wave caused 141 deaths. The high temperatures made the electricity demand soar. California, on July 24,