I have freezing hands and feet even though it's the summer, what could this be?

Could be hormonal. Cold hands and feet can be due to hormonal imbalances, auto-immune disorders, circulation problems, etc... Raynaud's phenomenon is a symptom caused by constriction of small blood vessels, usually in the fingers and toes, leading to a lack of nutrients and oxygen going to the fingers and toes. A primary care doctor, endocrinologist, or rheumatologist can evaluate and start treatment as needed.
Rayneud's Disease. This is a relatively rare diagnosis but can lead to abnormalities of the feet and hands with regard to temperature regulation. There is also a version called rayneud's phenomenon.