Why should a thermometer be raised approximately 2m above ground?

A thermometer should be raised approximately 2 meters above ground to ensure accurate temperature readings that are not influenced by ground-level factors, such as heat radiating from the ground, vegetation, or other surface materials. This height helps to measure air temperature more representative of the surrounding atmosphere. Additionally, it minimizes the effects of local microclimates and disturbances, providing a more consistent and reliable measurement for meteorological observations.