When you reignite a fire in game the temperature of the fire never gets above the starting point oftemperature at the fire oncetime it's relit. WThe reignited fire will not give a heat-buff, allow cooking, or dry cloathing.
For example, if the fire temperature drops to 100C after going out and then being relit,theat the point it is reignited, the fire will never get above 100C after it iit's relit. This is regardless of the amount of wood added or how long the fire is kept going. Until the fire completely goes out and is lit from scratch with new kindling and a firestarter, Until the fire completely goes out and is lit from scratch the temperature will never increase.
[[ https://www.youtube.com/watch?v=fsn7ohVFpkQ | Video Example]]