The monthly average temperature along with annual sunshine amount in London, Sydney and New York can be known from the above data. In a word, the monthly average minimum temperature in these three cities is higher than 0 degrees. In mid-July, the monthly average maximum temperatures in New York and London were 30 degrees and 25 degrees respectively, and the monthly average minimum temperature in Sydney was 15 degrees. In mid-July, the monthly average maximum temperatures in New York and London were 30 degrees and 25 degrees respectively, and the monthly average minimum temperature in Sydney was 15 degrees. In mid-July, the monthly average maximum temperatures in New York and London were 30 degrees and 25 degrees respectively, and the monthly average minimum temperature in Sydney was 15 degrees. From January to March, the monthly average temperatures in the three cities showed a stable trend, and the rising trend was the fastest from April to May, and then it became stable. After reaching its peak in July, they showed a symmetrical downward trend.Among the three cities, New York has the longest average sunshine time, followed by Sydney and London with the shortest average sunshine time. Among the three cities, New York has the longest average sunshine time, followed by Sydney and London with the shortest average sunshine time. Among the three cities, New York has the longest average sunshine time, followed by Sydney and London with the shortest average sunshine time.