However, the wine which was produced was of high quality and will be "highly sought" in years to come, Wine Tasmania says.

Released last month, Wine Tasmania report states "the smaller bunch sizes experienced led to a reduced harvest for Tasmania of 6624 tonnes in 2014 . . . The spring and early summer of 2013 promised solid yields in line with the previous vintage, with good soil moisture, fine weather and strong fruitfulness. December dashed those promises, however, with prolonged cool, windy and wet weather disrupting fruit set. The rest of the season brought wonderful weather, which allowed full flavour development whilst retaining good natural acidity at low to moderate Baumé."

Wine Tasmania chief executive Sheralee Davies said growing grapes in Tasmania's cool climate was always "high risk, high reward".

"The quality of wine produced in Tasmania is, almost without exception, very high, as was the case in 2014 - we just had less wine produced in this vintage," she said.

"In the 2014 vintage, the key reason for the lower volume was cooler, wetter and windier weather at the time of fruit set (December), which created smaller bunches and smaller berries, contributing to the reduced volume of overall fruit."

"The flipside is that the grapes are exposed on the vines for a longer period of time and it also brings significant variation between production levels from one vintage to the next, as you will see from our historical production records."

Ms Davies said that, although signs were positive heading into the 2015 season, it was hard to tell if production would improve.

"As growing grapes is so significantly impacted by the weather, it is difficult to predict exactly how the 2015 vintage will turn out.

"Preliminary signs are quite positive, with yields currently looking to return to average levels, but it is still too early to be more specific."