Hyperthermia (when the body is too hot - known in its acute form as heatstroke) and is medically defined as a core body temperature from 37.5–38.3 °C (4). A body temperature of above 40°C is likely to be fatal due to the damage done to enzymes in critical biochemical pathways (e.g. respiratory enzymes).
Herein, how cold does it have to be for a person to freeze to death?
People can even develop hypothermia at temperatures above freezing if it's raining. Normal core body temperature is 98.6 degrees Fahrenheit, and mild hypothermia sets in at about 95 degrees F. After that, "as you start dropping [in temperature], bad things happen," Sawka said.
What is the lowest body temperature a person can have?
The record for the lowest body temperature at which an adult has been known to survive is 56.7 degrees F, which occurred after the person was sumgered in cold, icy water for quite some time, according to Castellani.
What temperature will make you die?
Our cells start to die around 41°C (106°F) to 45°C (113°F) but we can survive much higher air temperatures: a healthy person could make a day trip to Death Valley on one of its hottest days-- 55°C (131°F)-- and, so long as he avoided dehydration, would probably not die.