When it gets cold, every part of my body stays warm except for my feet. Why is this, and how can I keep them warm?
There are several reasons why your feet may be more susceptible to feeling cold when it gets chilly outside. Here are a few possible explanations:

    Poor circulation: Blood flow is typically slower in the extremities, including the feet, and this can result in a decreased ability to keep the feet warm.

    Lack of insulation: Feet often have less insulation and body fat compared to other parts of the body, which can make them more susceptible to the cold.

    Evaporation: Feet sweat more than other parts of the body, and this moisture can cause the feet to feel cold and damp, especially in cold weather.

There are a few things you can do to help keep your feet warm:

    Wear warm, insulated footwear: Invest in a good pair of insulated boots or shoes that are designed to keep your feet warm and dry. Look for boots with insulation and a waterproof lining.

    Wear thick socks: Thick wool or synthetic fiber socks can provide extra insulation for your feet and help to wick away moisture.

    Exercise regularly: Exercise helps to improve blood flow, which can help keep your feet warm.

    Warm up your feet before going outside: You can warm up your feet before going outside by soaking them in warm water or using a heating pad.

    Avoid tight footwear: Wearing shoes that are too tight can restrict blood flow to your feet and make them more susceptible to the cold.

By taking these steps, you may be able to reduce the chance of your feet feeling cold when the temperature drops.
Is there anymore way?
The previously mentioned explanations, such as habits, environment, and clothing are the most likely to be the cause. However it is possible for the symptoms to be explained by underlying medical conditions. WebMD lists several possible conditions: 
- Stress and/or anxiety 
- High cholesterol
- Anemia
- Buerger's disease (particularly in tobacco users) 
- Raynaud's disease or Raynaud's phenomenon 
more common in those with diabetes: 
- Peripheral artery disease 
- Peripheral neuropathy

As always, it is best to consult your doctor if you believe there is an issue.