Weather, and climate change, impact agriculture in a number of ways. Both crops and livestock have needs that weather plays into. So far, climate change has already started affecting agriculture. For example, as of July 2014, California has lost $2.2 billion dollars in agricultural revenue from drought, Cleveland, Ohio's NBC affliate WKYC reported.
As for livestock, if the core temperature of the animal gets too high, the animal becomes stressed. This can cause a decline in production of many products, including meat, milk and eggs. Extreme cold also impacts livestock negatively.
Agricultural commodities generate approximately $330 billion dollars each year in the U.S., and livestock makes up around half of that value. Since crops are also sensitve to weather and climate change, animal feed is affected by climate change. If pastures are too dry, producers lose money by having to purchase another type of feed for the livestock. Pricing of feed is also affected by weather, so feed might cost producers a lot, as well.
Learn more by reading the National Climate Assessment's agriculture highlight.