hello, this situation of yours should be caused by deficiency of yang qi. Lack of yang can't warm the limbs, plus the cold outside in winter,

Suggestions:

If the internal and external factors are intertwined, you will see the symptoms of cold hands and feet. In this case, you can take some Chinese patent medicines for warming yang and tonifying kidney, such as Guifu Dihuang Pill, which should have obvious effects.