According to German Wikipedia, the predicate "officially recognised climatic health resort" is given to "places whose air and climate, according to an expert report, have properties that are beneficial for recreation and health. This report must be repeated regularly."
Reit im Winkl was named an officially recognised climatic health resort in 1956 and has repeatedly met the requirements for the report since then.
Reasons are, on the one hand, the altitude, which ensures that the summer heat is moderate and the nights remain pleasantly cool. The town is surrounded by extensive mountain forests of the Chiemgau Alps and is part of the “Bavarian Alps climate area".
The weather characteristics are largely determined by the conditions, i.e. by the influence of the mountain ranges and the valley cuts on the weather. In Reit im Winkl, 16 humid days can be expected, a value that remains well below the set limit of 25 days per year for recognition as a climatic health resort.
In addition to the natural conditions for good air, we also actively ensure that the good mountain air is preserved: with the "Naturwärme" heating plant (see below), with aisles in town that are not built on, with public transport that reduces car traffic, with hiking trails that start directly in town and do not require driving to trailheads.