The numerical results  are approximated to the official website information of Jilin province, which reported that the seasonal frost-depth of Jinlin province varied from 1.3 to 2.0m, and that the soil surface was frozen in mid-November and then thawed between late March and early April.

reported 后面接的两个宾语从句，第一个that 可以省略不用，但第二个that 必须使用，不能省略。