Seasonal frost depths, midwestern USA, Version 1

This dataset includes frost tube data from 37 stations in the Upper Midwest (Minnesota, North Dakota, Wisconsin), USA. The responsible agency was the St. Paul...本数据集涵盖美国上中西部地区（明尼苏达州、北达科他州、威斯康星州）37个观测站的霜冻管监测数据，负责的主管机构为圣保罗（St. Paul）……