Global Milk Price Continues Down May 14, 2014 12:00 am The latest Fonterra milk auction shows values continuing to slide. The latest sale, on the 20th May, saw the weighted average price drop 1.8% (to $3,873 per tonne). This is in addition to a 1.1% drop for the auction a fortnight earlier. Overall, prices are now 23% lower than the high-point reached in early February ($5,042 per tonne). The market is around 15% down compared to the same time last year.