[header] How to get used to cold temperatures [title] Get out in the cold. [step] If you want to be able to get used to the cold, you'll have to actually get out in it. If it's late fall or winter, or if you live in an area with a year-round cold climate, spend a couple hours outside every day. 
Only wear as much warm clothing as necessary, and shed layers once you get more comfortable. With time, you'll be be able to spend longer and longer outside and be affected less by the temperature.