There are certainly a number of factors that influence food prices as seen in the CPI. As you mentioned, they are certainly influenced by weather patterns and the ability to produce food.
One factor that we're also seeing impact food prices right now is the price of transportation, which is very much linked to gasoline and diesel prices. Because there are a number of factors that influence food prices, it's not possible to easily decompose the exact impact of transportation, but it's certainly a factor.