Released on March 17: In December 2016, mailbox milk prices for the federal order markets reporting mailbox prices averaged $18.67 per hundredweight, up $1.47 from the November 2016 average and $1.54 higher than December 2015. The California mailbox price is calculated by the California Department of Food and Agriculture. Mailbox prices reflect the actual price dairy operators receive for their milk, hence the name mailbox price. Typically, they are released about 3-1/2 months following the month for which the prices apply. Mailbox prices are reported at average fat tests and reflect all premiums, as well as marketing costs, including hauling.