The Ministry for Primary Industries said grape growers suffered a significant erosion in profits over the last season, with unfavourable weather in both Marlborough and Hawke's Bay leading to a 20 per cent drop in average yields.
In addition, in Hawke's Bay the cool summer and the added challenge of rain at harvest meant growers there struggled to meet contract requirements for quality and ripeness, and prices suffered as a result, the ministry said.
"On the positive side the lower yield helped bring the market more into balance," the ministry's Nelson-based senior policy analyst Nick Dalgety said in a statement.
See the Ministry's latest viticulture report here.
As a result the final price that growers expect for the 2012 crop of Marlborough sauvignon blanc increased for the first time in four years to $1315 per tonne, up 11 per cent from $1190 last year.