The trader wants the futures commodity to go higher as quickly as possible. The higher the volatility, the better the chance your commodity will jump higher, and hence the better the chance the call option will be worth more in the future. If an option has a good chance of being worth more in the future, it usually costs more to buy it now. The volatility value has no directional bias. Volatility expresses no information about the direction the futures commodity will ultimately move.
Volatility only tries to characterize the amount of the move in the futures price from day to day.
Each day commodity prices vary between the high and low intra-day, then settle on a closing price at the market close. The key assumption in the Black-Scholes model is that the difference in price, from day to day, satisfies a Gaussian distribution. We can compute the standard deviation, std, of the price differences. It is also referred to as the historical volatility. Statistical volatility is a historical indication of the amount of commodity price difference variation that has occurred in the past.