Southland dairy farmers woke on Wednesday to the strongest Global Dairy Trade result in nine months, with whole milk powder climbing 5.9 per cent and the overall price index up 3 per cent.

The fortnightly auction, trading event 415, closed overnight on Tuesday New Zealand time. According to a United States Department of Agriculture summary of the results republished by IndexBox, whole milk powder averaged US$3971 a tonne across all contracts. Farmers Weekly described the lift as the powder's largest single gain this year and the index movement as the biggest since February.

Skim milk powder rose 3.1 per cent to an average of US$4109 a tonne, which Farmers Weekly said was its highest level since June 2022. Cheese did even better in percentage terms, with cheddar up 8.6 per cent to US$3970 and mozzarella up 5.8 per cent to US$4104.

The fats went the other way. Butter fell 4.7 per cent to US$4503 a tonne, anhydrous milk fat dropped 3.2 per cent to US$5306 and buttermilk powder slipped 4.4 per cent to US$4312. Lactose, offered only for January delivery, gained 3.3 per cent to US$1728. NZX analysts, quoted by Farmers Weekly, put the weakness in fats down to surplus supply out of New Zealand, Argentina, the United States and Europe.

Buyers from China accounted for 59 per cent of the volume sold, which Farmers Weekly credited with driving the powder prices higher.

Rosalind Crickett, who analyses the dairy market for NZX, said the outcome had comfortably beaten what both the futures market and physical traders had been expecting going into the event.

The result continues a run of rises. The index gained 1.2 per cent on 6 October and 2.5 per cent on 20 October before this week's 3 per cent, so powder prices have now moved up at three consecutive events.

Whole milk powder is the product that matters most to the farmgate milk price, and the timing is helpful for Southland. Fonterra lifted its forecast for the 2026-27 season to $9.75 a kilogram of milksolids last month and added 20 cents to the advance rate paid to its suppliers, including those sending milk to Edendale. Bank economists had already been talking about a $10 payout before this auction, and Farmers Weekly reported that farmers now expect processors to lock in high world prices while the New Zealand dollar remains low against the US dollar.

Southland herds averaged 481 kilograms of milksolids per cow last season, so any further move in the forecast flows straight through to farm incomes across the province.

The gains follow a wet winter and spring across much of Southland, which the Herald has reported left soils saturated and pasture growth behind. Farmers Weekly noted that the question now is whether processors hedge enough of the current prices to carry them through to the end of the season in May.

The next Global Dairy Trade event is due in a fortnight.