Dairy production was higher than usual in June, with Fonterra collecting 9 million kilograms of milksolids, 10 per cent more than in June last year.
North Island collections for the month reached 7 million kg, 13 per cent up on a year ago as more farmers continued to milk into winter.
South Island collection reached 2 million kg, 2 per cent ahead of June last year. Few South Island farmers provide milk in winter for New Zealand's internal supply.
Fonterra's milk production in Australia was up 16 per cent year-on-year in June to 8 million kg, but production in the year to June 30 was flat.
Dairy prices fell 4.9 per cent at the latest GlobalDairyTrade auction last week, and are down nearly 30 per cent since February.