Fahrenheit Centigrade Kelvin
Boiling Point of Water 212 100 373
Common "Mild" Temperature 70 ~20  
Typical SF Afternoon Temperature in Summer 61 16  
Typical SF Afternoon Temperature in Winter 50 ~10  
Freezing Point of Water 32 0 273
Temperature Same in Fahrenheit and Centigrade -40 -40  
All molecular activity ceases   -273 0