NCDC TD3220 U.S. Cooperative Summary of Month

This data is obtained from the National Climatic Data Center (NCDC). "Information contained in this monthly data file are primarily those from the cooperative network, augmented by observations from principal climatological stations operated by the National Weather Service and other sites having highly trained observers."

本数据集源于国家气候数据中心（NCDC）。该月度数据文件所包含的信息主要源自合作网络，辅以国家气象服务运营的主要气象站以及其他拥有高度训练有素的观测者的观测数据。