Answer:
cold weather:decrease rigor mortis warm weather: increase
Step-by-step explanation:
Ambient temperature: Warm conditions speed up the onset and pace of rigor mortis by providing a hospitable environment for the bacteria and processes that cause decay. Cold temperatures, on the other hand, slow it down. If someone dies outside in freezing temperatures, rigor mortis can last for days.
Not only does the surrounding ambient temperature affect the onset of rigor mortis, but the internal temperature of the body at death does as well. Having a high fever at the time of death will accelerate the progression of rigor mortis.