" Invest in an instant-read meat thermometer for roasting meats (and use it for smoking meats, too). Check large roasts in multiple spots, because one part can appear done while another is undercooked. An internal temperature variance of just a few degrees can mean the difference between juicy and dry. My rule of thumb for cooking a large roast is once its internal temperature hits 100°F, it’ll start climbing at a rate of about a degree a minute, if not faster. So if you’re aiming for medium-rare, around 118 to 120°F, then know that you’ve got about 15 minutes before it’s time to pull. Large roasts carry over about 15°F, while steaks and chops will carry over about 5°F, so account for this any time you pull meat off the heat. "

― Samin Nosrat , Salt, Fat, Acid, Heat: Mastering the Elements of Good Cooking