下表是我东部地区四地的气候资料。完成下面小题。                                                                                                                                                                                                          

地区	①	②	③	④
年平均气温/℃	8.1	23.5	2.6	18.3
≥10℃积温/℃	3900	8200	2800	6500
年降水量/毫米	621	1980	538	1350