Permissible hydrogen limits themselves do not change with climate, because they are defined by fault criteria, not by ambient conditions. However, climate strongly affects the background level and trend. In hot regions with intense solar radiation, higher oil temperature accelerates gas generation and diffusion, so the baseline hydrogen level may be slightly higher and more variable. That is why in such climates trend analysis is more important than absolute values: a stable 50-100 ppm may be normal, while a fast rise is a real alarm regardless of location.