https://phys.org/news/2018-10-nasa-hurricane-sergio-cloud-temperature.html

At the time Aqua passed overhead, coldest cloud top temperatures in thunderstorms circled the eye and appeared in fragmented bands of thunderstorms north and south of the center. Those temperatures were as cold as or colder than minus 63 degrees Fahrenheit (minus 53 degrees Celsius). The exception was on the western side of the storm, where cloud top temperatures were warming, meaning they were not getting as high in the atmosphere.

Despite the slow weakening the hurricane still has a large but well-defined inner-core in the low and mid-levels.