Stone says the core temperatures is 167 Kelvin and it's going to get much hotter. 167 Kelvin is actually 111 degrees below zero Celcius or 168 degrees below zero Fahrenheit. The Kelvin scale starts absolute zero which is -273.15 degrees Celcius or -459.76 Fahrenheit.
When Fargo is telling Allison that the spore count has dropped to 5.8PPM the screen behind her still reads 6.0PPM.