How do you use standard deviation in your life? - Answers

I think standard deviation comes into play with the weather, for instance when comparing two cities. They may both has similar average temperatures year round, as is the case with Las Vegas, NV and San Diego California, both of which sport a nice annual average (average of the monthly averages) in the mid 60's. San Diego very rarely has days above 90, whereas Las Vegas spends at least a third of its year over 90. San Diego's temperature is very moderate compared to Las Vegas that gets hot in the summer and freeze in the winters.