Temperature is a game mechanic that controls how warm or cold the player is. It is depicted by a thermometer at the left of the UI. During most gameplay, the character will not have to worry about temperature; however, when venturing into the Cave of Ringing Wind, the player will need a Warm Hat. If the temperature drops too low, the player will begin losing Health.
The default temperature for Willie and Annie is 50; for Fiery, it is 451.